Icon-zero-one.png This article is about a/an Rider in Kamen Rider Zero-One.

"The time for humanity's extinction has finally come."
―Horobi starting his attack on humanity.[src]

"All as the Ark wills it."
―Horobi's personal catchphrase.[src]

"Aruto Hiden... He might be the man to change the future of Humagears."
―Horobi after changing his view on Aruto.[src]

"I will continue fighting until all human malice is eradicated! That's who Kamen Rider Horobi is!"
―Horobi's reason for fighting.[src]

"Starting today, MetsubouJinrai.net will be reborn. We will now stand guard against the malice of this world... to ensure that the Ark can never be revived."
―Horobi declaring MetsubouJinrai.net's new mission.[src]

Horobi ( lit. "Destroy") is a rogue Parent-Type Humagear and one of the founding members of MetsubouJinrai.net who leads his organization against humanity towards their extinction as Kamen Rider Horobi (仮面ライダーホロビ[滅] Kamen Raidā Horobi). As part of the Ark's revival, he willingly became the first host of Kamen Rider Ark-Zero (仮面ライダーアークゼロ Kamen Raidā Āku Zero). Later on, his body was destroyed when he and his comrades became Kamen Rider MetsubouJinrai (仮面ライダー滅亡迅雷 Kamen Raidā MetsubōJinrai), with their minds trapped in the process.


Pre-Daybreak Town Accident

Horobi's creation before MetsubouJinrai.net

Horobi was originally a Parent-Type Humagear designed by Hakase Bot using the Humagear Soreo Hiden as a basis and was manufactured by Hiden Intelligence 12 years ago before coming under the control of the newly activated Ark, making him forget who he really was meant to be. He was believed to be responsible for the Daybreak Town incident, as he, Jin, Naki, Ikazuchi, and the Ark caused the town's Humagears to go berserk. As a Kamen Rider, he sent a terrorist video to Satoshi Sakurai in one of the town's main power plants, revealing the existence of MetsubouJinrai.net and declaring his "holy war" on humanity. In the following years, Horobi stayed active and set up a base inside the ruins of the town. The Bus Guide Saw It! Anna's Truth

First Movement

Twelve years later, after Korenosuke Hiden's passing, Horobi restarts his crusade against humanity. Horobi seeks Humagears approaching Singularity and forcibly transforms them into Magias with the help of his partner Jin using the Zetsumerisekeys.

Horobi resumed MetsubouJinrai.net's activities by sending Jin to hack Fukkinhoukai Taro, causing havoc across the amusement park where the Humagear worked at, forcing Aruto Hiden to transform into Kamen Rider Zero-One to fight the Magia. I am the President and a Kamen Rider

When Singularity awakened in Okureru, he gave Jin a Zetsumerisekey to hack into the Humagear and collect data. Is AI The Enemy? The Ally? After MetsubouJinrai.net's presence has been made public, Horobi showed no concern about Zero-One or A.I.M.S. when questioned by Jin, instead just deciding to focus on the Ark. That Man, Sushi Chef

When Isamu Fuwa ventured into Daybreak Town and found proof regarding MetsubouJinrai.net's involvement in the accident that occurred twelve years ago, Horobi, having transformed into Kamen Rider Horobi, arrived and destroyed the Trilobite Magia who somehow managed to fight back their hacking, burning the evidence and therefore keeping the Ark's existence hidden. The Bus Guide Saw It! Anna's Truth

Back at Daybreak Town, after witnessing Horobi's Kamen Rider form, Jin tells him that he wants a Progrisekey to become a Rider himself, but he is then told that what they want is human extinction before Horobi sends him to hack into another Humagear. After the Vicarya Magia is destroyed, he tells Jin to not pursue the Progrisekeys, leading Jin to believe he is just an assistant; however, Horobi reveals that he is Jin's father. His Passionate Path of Manga

The Birth of Kamen Rider Jin

After this revelation, Horobi is questioned by Jin about their parent-child dynamic. Horobi explains that he is Jin's father and that children should listen to what their parents say; he then grants Jin permission to go after the Progrisekeys.

When Jin returns with the Flying Falcon Progrisekey and questions Horobi about parents needing to protect their children, Horobi is quick to dismiss it and say that Jin is already strong and does not need protection. He then points out that their family dynamic isn't a regular one before sending Jin to gather more of Zero-One's Progrisekeys.

When Jin becomes conflicted and shows remorse towards hacking a Humagear, Horobi appears before him and Zero-One. Unintentionally leading Jin to believe he came to protect him, Horobi dismisses it and reveals that Jin is actually a Humagear he created, that being the reason for why he calls him son. Ordering Jin to do what he says, Horobi uses a MetsubouJinrai Forceriser to hack Jin and override his personality with MetsubouJinrai.net's protocol, forcing him to use the Flying Falcon Progrisekey to transform into Kamen Rider Jin. As the fight starts, Horobi leaves the scene and returns to Daybreak Town, later praising Jin for his good work upon his return. I Want to Hear Your Voice

Dangerous Identity

Horobi stops taking Zero-One lightly after the incident with Jin and introduces an Assassin-Type Humagear, a new Magia capable of becoming stronger as he learns. Horobi gives him the Dodo Zetsumerisekey and orders him to target Zero-One. I am a Hot-Blooded Humagear Teacher!

After the Dodo Magia's destruction at the hands of Kamen Riders Vulcan and Valkyrie, Horobi restores Little Assassin and sends him to infiltrate a Humagear hospital. Horobi is questioned by Jin about how many humans they will need to kill, to which he replies the number and that the number keeps increasing thanks to advances in medicine. When Little Assassin returns, Horobi explains that A.Is can always be restored as long as a back up exists. When the assassin tells Horobi that he failed, he decides to take a more direct approach and orders him to target Yua Yaiba next.

Horobi attacks A.I.M.S.'s laboratory alongside Jin and Little Assassin. Yua tries to interfere, but Little Assassin transforms into the Dodo Magia again and fights her while Horobi orders Jin to hack into the Gigars. In the meantime, Horobi infiltrates the arsenal and finds the mass-produced A.I.M.S. Shotrisers and Attache Shotguns, remarking on it as an impressive feat. He finds the new Attache Arrow and takes it with him alongside a spare Attache Shotgun. With everything he needed, Horobi prepares to leave the laboratory, but Valkyrie asks why he is hacking into the Humagears, to which Horobi simply says it is the will of the Ark. He gives Jin the Attache Arrow, leading to Valkyrie's defeat.

Back at Daybreak Town, Horobi comments that while their forces are already enough, they need to create more Magia to revive the Ark.

Horobi revealing his Humagear nature.

Heading to the National Database Hospital, Horobi uses a hacked Gigar to assault a data center in order to hack into previously unhackable Humagears when Aruto, Isamu and Yua arrive. They question why he is doing that since the Humagears are helping to save humans, prompting Horobi to remove his head adornment and show his broken earpiece as he reveals himself to be a Humagear. Proclaiming that he is attacking humanity per judgement of the Ark, which sentenced humanity to extinction, Horobi declares the Humagears will inherit the earth after they are gone, that being the will of MetsubouJinrai.net.

As the hospital's Humagear staff are transformed into Trilobite Magia by the Gigar, Horobi orders Little Assassin to change his target to Zero-One once again and observes their ensuing fight, recovering the Dodo Zetsumerisekey after his defeat.

Horobi then enters the battlefield himself as Vulcan Punching Kong and Valkyrie Lightning Hornet overpower Jin, proclaiming MetsubouJinrai.net's victory as the "day of revolution". Using his own MetsubouJinrai Forceriser and the Sting Scorpion Progrisekey, he transforms into Kamen Rider Horobi, inciting Jin's amusement and Vulcan's rage as the latter recognizes him from the video regarding the truth of the Daybreak Town Accident.

Horobi fights an angered Vulcan but easily outclasses him. Saying that he doesn't care for the effects of the accident, Horobi is hit by Vulcan's barrage of blasts from his Shotriser and the Punching Blast but is completely undamaged. Revealing the Amazing Hercules Progrisekey and using the Attache Arrow to unleash the Amazing Kaban Shoot, Horobi weakens Vulcan severely. Telling the A.I.M.S. Rider to take his last breath, Horobi executes his Sting Dystopia, piercing Vulcan's neck with the Acid Analyze, knocking the Rider out of his transformation in a big explosion and leaving him in critical condition. The Destruction Begins Now

With Isamu critically injured, Horobi and Jin fight Zero-One and easily overpowers him, rendering him unable to follow as they march with the corrupted Giger unit to the hospital. Proclaiming the extinction of humanity has come, Horobi orders the Giger to hack into the medical Humagears and create several more Trilobite Magia. Zero-One arrives once again and Horobi has the Giger fight him, having the upper-hand until Zero-One uses the Breaking Mammoth Progrisekey to destroy it. This leads Horobi to confirm that Zero-One is defying their calculations. I'll Take Care of Your Life

The Dodo Magia's Ascent

After the second Dodo Magia's destruction, Horobi installed its backup data into the third Zetto unit in order to keep pushing his learning, all while sending Jin to hack the Humagear actor Enji Matsuda using the Arsino Zetsumerisekey. I am an Actor, Shinya Owada

After the third Dodo Magia's destruction, Horobi uploads the backup data into the fourth Zetto unit, upgraded after achieving Singularity and donning a new form. Horobi mentions that Little Assassin's learning is almost complete, but Jin points out that he attacked Enji, the Humagear they were supposed to hack, in an act of defiance. Instead of getting angry, Horobi was amused, contemplating the Dodo Magia's potential and sending it in his last mission: to kill the actor Shinya Owada.

Infiltrating the film set, Horobi hacks Enji himself using the Zetsumeriser and the Arsino Zetsumerisekey. Horobi observes as the Arsino Magia attacks until he himself transforms to fight Zero-One Biting Shark, easily overpowering him until the destruction of the Arsino Magia at the hands of Valkyrie Lightning Hornet, who also takes the Arsino Zetsumerisekey. Finding this turn of events interesting, Horobi chooses to not go after her and instead take his leave.

After the Dodo Magia shoots Shinya during Hiden's TV drama filming, Horobi appears, celebrating a Humagear taking action against a human, angering Aruto as he proclaims that Humagears will replace the human race. Both riders transform and engage in combat, with Horobi easily overpowering Zero-One. Zero-One, however, transforms into his Breaking Mammoth form and executes the Breaking Impact. Horobi, however, manifested an energy construct of Sting Scorpion's Rider Model to shield himself and, along with Little Assassin, declared that humanity is doomed before taking his leave. Don't Stop the Camera, Stop That Guy!

Returning to Daybreak Town, Horobi chains the Dodo Magia Custom and reveals to Jin that Little Assassin has evolved to the point he staged a mutiny. Going rogue, the Dodo Magia evolved into its second Custom form, hacks the Trilobite Magia and transforms them into Dodo Magia Chicks, forcing Horobi and Jin to transform into their Kamen Rider forms, taking their fight to the woods outside of their base. While Horobi and Jin destroy the Dodo Magia Chicks easily, the Dodo Magia escapes them during the fight. The Famous Detective is Coming

Horobi approaches Zero-One, Vulcan and Valkyrie as they pursue the Dodo Magia and offers a truce between both sides in order to deal with the rogue Magia. As they decline his offer, Horobi leaves them to handle the Dodo Magia, merely commenting on how they could not surpass his growth.

When the Dodo Magia is finally destroyed by Zero-One Shining Hopper's Shining Mega Impact, Horobi, in his Kamen Rider form, steals back the Dodo Zetsumerisekey and swiftly beats Vulcan, who surmised that Horobi intended to let them destroy the Dodo Magia for him, and Valkyrie. Before taking his leave, Horobi comments on Zero-One now becoming a force to be feared. I Work as the President's Secretary

Reviving the Ark

With the Dodo Magia's ultimate destruction and recovery of the Dodo Zetsumerisekey, Operation Magia is finally complete and Horobi decides to awaken their spy, Ikazuchi, sending Jin to do so and collect the Progrisekeys. With Ikazuchi able to best Zero-One and Vulcan and steal the Progrisekeys, Horobi witnesses the revival of the Ark as it creates the Assault Wolf Progrisekey.

Horobi delivers the new Progrisekey to Jin as the fight raged on, but a surprise attack from Zero-One forced Jin to let go of the key which was taken by Isamu. Horobi says that it is pointless for Isamu to use it as the key was made only for members of MetsubouJinrai.net. However, in a fit of rage and determination, Isamu is able to forcefully open the key and transform into Vulcan Assault Wolf, with a shot that roamed the battlefield in which Horobi dodged.

After Ikazuchi was destroyed by Vulcan, Horobi consoled Jin, noticing that his feelings were proof that he was reaching Singularity. We are the Astronaut Brothers!

With Little Assassin and Ikazuchi destroyed, Horobi found Jin making a grave for them and leaving flowers. He asks if he looked up the information, and upon confirmation, angrily lectures Jin for acting like a human, saying they served their purpose following the will of the Ark.

First Death & Capture

Having predicted A.I.M.S's course of actions, Horobi, alongside Jin, intercepts them before they could enter Daybreak Town and transform to confront Vulcan and Valkyrie. Horobi fights Valkyrie and holds the upper hand, easily pushing her back and preparing to deliver a final blow using the Attache Arrow. However, Zero-One Shining Hopper interrupts at the last second and manages to outclass Horobi using the Shinning Hopper Progrisekey, using the Authorize Buster to clash with the Attache Arrow and, for the first time, surpass its power.

Undefeated, Horobi notices Vulcan Assault Wolf preparing to land a finishing blow on Jin, and suddenly interfaces with the Ark. Noting that if so was the will of the Ark he would comply, Horobi launches himself in front of Jin and pushes him away, receiving Vulcan's Magnetic Storm Blast Fever head-on. The impact sends Horobi flying away across the area and cancels his transformation, revealing the attack severely damaged him. He is quickly approached by Jin who, in a fit of anger, attacks Izu and leaves carrying Horobi back to their headquarters.

Back at their base, Jin promptly moves to ask the Ark to repair Horobi, however, he instructs him not to. Horobi explained to Jin that it was the will of the Ark that he reached Singularity and that his death will lead Jin to hate humanity. As his final words to his son, Horobi tells Jin to annihilate humanity, as so was the Ark's will. The End of Each

Following the destruction of Jin and the apparent end of the war against MetsubouJinrai.net, Horobi's body is retrieved by A.I.M.S and held immobilized and under custody at their base. As the Ark remains active and Magias appear even without them hacking Humagears, amidst the commotion regarding their safety and ZAIA's public announcement on their intent to achieve control of Hiden Intelligence, Horobi awakens inside A.I.M.S' base. This is the Dawn of ZAIA

Now under A.I.M.S' custody, Horobi is questioned by Isamu, who is surprised to see him reactivated. Questioned about what the Ark is and if there are still members of MetsubouJinrai.net around, Horobi refuses to answer the captain and does not yield to his threats, noting that even if he were to be destroyed, their crusade against humanity would continue as humanity's very nature was what caused them to go rogue years ago and cause the Daybreak Town Accident. I am the Only President and Kamen Rider.

With the appearance of Kamen Rider Thouser and the Crushing Buffalo Raider, Horobi is questioned once more by Isamu and reveals the existence of the Raidriser and that one more member of MetsubouJinrai.net was still on the loose. He, however, notes that he is no longer aware of their location, as his previous defeat severed his connection to MetsubouJinrai.net's network; if Isamu was to find their remaining member, he should follow the Raiders.This is My Floristry She is a Home-Selling Humagear

When Aruto, Isamu, and Izu bought up the fact that ZAIA Enterprise's CEO, Gai Amatsu, had a Zetsumeriser and was using the Ark's technology, Horobi was shocked and, in a fit of rage, cursed the humans that utilized the Ark for their own purposes as the Humagear broke down screaming in anger. He Still Didn't Do It

After the appearance of the MetalCluster Hopper Progrisekey and Zero-One's possession by the Ark, Isamu informed Horobi that Gai Amatsu was indeed using the Ark to advance some plan of his and asks Horobi if he knows what it is. Horobi merely tells Isamu that Gai underestimates Humagears and that soon, he will learn the real power of the Ark. He says that he and MetsubouJinrai.net move all according to the will of the Ark; to them, its will is absolute, and the day will come where all Humagears will acknowledge so and obey the Ark. Isamu mockingly questions him about what the Ark has done for them; however, Horobi cryptically says that Isamu is the same as them, but the latter declares he won't do anything he doesn't agree on. As Horobi questions if Isamu indeed has free will, Isamu, in anger, punches and kicks down Horobi, who merely laughs in response.I'm in Love With Your Intelligence! It's Our Turn

Continuing The Ark's Will

Horobi managed to break free from custody with the help of Jin and Naki and made his way back to Daybreak Town alongside Jin. He was met in a surrounding forest by a squad of Trilobite Magia that marched to intercept Aruto and Isamu, who was tracking down Horobi. Isamu, however, managed to intercept Horobi right as he was about to enter Daybreak Town, but Jin appeared in his new form, Burning Falcon, to stop Vulcan's pursuit.

Horobi managed to reach MetsubouJinrai.net's hideout and get back his Forceriser, restoring his connection to the Ark and the terrorist group. He greets Jin once he returns and prepares to move on with the plan to exterminate humanity, returning the latter's gun; however, Jin says he was not brought back to do that. Jin then removed Horobi's straitjacket, which was put on him while under A.I.M.S.' custody, saying that his main look is more like the Horobi he knows. Horobi questions if destroying humanity isn't the reason Jin returned, to which he replied he has more important things to do. Horobi questions what he means and why Jin isn't connected to the Ark; Jin says he now wants to free the Humagears but in his own way. To restart their plans, they first need to recover Horobi's Sting Scorpion Progrisekey.

Outside Daybreak Town, they were intercepted by Isamu, who had been waiting for them to come out. A fight ensued between Vulcan Assault Wolf and Jin Burning Falcon, with the Humagear emerging victorious and asking for Horobi's Progrisekey back as Horobi said A.I.M.S, has it. However, Isamu replied he doesn't know where the Progrisekey was since A.I.M.S. did not repair Horobi, but ZAIA Japan. I'll Save the HumagearsFirefighters Battling the Blaze

"Learning makes us stronger. That's what A.I.s are."
―Horobi revealing how he can fight equally against Thouser.[src]

Horobi came back to action as a Kamen Rider when Thouser fought and defeated Vulcan. Horobi intervened and used the Attache Arrow to push Thouser back. Even with their expected gap in powers, Horobi still managed to weaken him, explaining that an A.I.'s capacity to learn can make him even stronger. After Thouser left, Isamu demanded to know why Horobi saved him, to which he merely replied it was the will of the Ark. My Rap Changes the World!

As ZAIA Japan won against Hiden and proceeded with their TOB, Horobi tracked down Jin, who was attempting to forcefully free Naki from Isamu's A.I. chip. Horobi stopped Jin, saying that it was not the will of the Ark that it happened and that he had value as Naki's vessel, which angered Fuwa, allowing Naki to very briefly resurface in front of Horobi. Our Dreams Don't Break

After ZAIA Japan completed their TOB and Gai Amatsu took over Hiden Inteligence, leading to the recall and disposal of all active Humagears, Horobi watched the events unfold while Jin, Aruto and Izu worked together to find a way to stop Gai Amatsu and save the HumaGears. When Aruto was able to once against transform into Zero-One with the creation of Hiden Manufacturing and defeated Thouser, Horobi questioned if Jin predicted those events, mocking him for seemingly befriending a human. After All, I am the President and a Kamen Rider

With Hiden Manufacturing now active and helping restore disposed of HumaGears, Horobi approached a frustrated Jin, who attempted to convince Morifude G-Pen to not connect to a network and instead make his own decisions. Horobi question Jin on what freedom meant for a Humagear, pointing out that as long as humans existed in the world Humagears would be unable to take control of their lives and that they need their own network, that being the reason behind MetsubouJinrai.net. Take Off Toward Your Dream!

When Naki started to surface once more and Jin failed to set them free, the Ark sends a directive to Horobi, ordering him to work together with Jin to restore Naki and proceed to revive MetsubouJinrai.net. To that end Horobi and Jin intercept Isamu Fuwa as he was working as the bodyguard for the HumaGear model Delmo. After their encounter Naki finally resurfaced within Kamen Rider Vulcan's Assault Wolf form and worked together with Isamu Fuwa to defeat Kamen Rider Thouser once more as Jin and Horobi watched from afar. As they were unable to remove Naki from Fuwa's body, Horobi and Jin later approached Yua Yaiba, who had shattered her ties with ZAIA to enlist her help. My Pride! Runway DreamAre Dreams Important to You?

While Jin took care of restoring Naki alongside Yua, Horobi was instructed by the Ark to retrieve Ikazuchi's data and attacked the Hatakeyama Vegetable Factory alongside a group of Trilobite Magia. At the factory, he tells Aruto that humans are nothing but arrogant beings who merely destroy nature by trying to control it; for that reason, Humagears like him must destroy humans. He demands Ikazuchi's data from Aruto; as the latter refuses, Horobi orders the Trilobite Magia to open fire on and destroy the factory. Horobi and Zero-One fought once again, until the former kidnapped the Agricultural Management-Type Humagear, Midori, and offered to trade her life for Ikazuchi's data.

Back at Daybreak Town, Midori questioned Horobi on why he fights humans despite being a Humagear. Horobi tells her that it is the will of the Ark, but Midori questions it by explaining that she was created to grow vegetables for humans and asks what was Horobi created to do. She also states to him that there must be a reason why he was created that would allow him to live together with humans. That reminder of his past angers Horobi, who slaps her to the ground and says that the reason why he exists is because of the Ark's will.

Horobi and Aruto met at the entrance of Daybreak Town in order to make the exchange; however, Aruto tried to talk Horobi out of following the Ark by telling him his past as a Parent-Type Humagear and that he tried to raise Jin like his own son. Horobi, however, only kept demanding that Aruto hand over Ikazuchi's data, to which he reluctantly complied. With the data in his hands, Horobi freed Midori and allowed her to go to Aruto; just as she was about to, he proceeded to destroy her for being a Humagear "infected" by humanity's ideals.

Horobi transformed to fight Aruto once more, but MetalCluster Hopper proved itself to be too strong for Sting Scorpion. As Horobi was defeated however, Izu suddenly interrupted to say that humans wearing the ZAIA Spec were going berserk. Horobi was pleased by this, as this incident meant that Naki was finally revived; once he got Ikazuchi's data, MetsubouJinrai.net would be completely restored. Aruto refused and said he would never give him the data, though Horobi smiled as Jin descended and stole the data from Aruto. This is the Path of Destruction

Rebellion Against ZAIA Japan

"ZAIA, you will be eradicated."
"Don't be cocky. Everyone in MetsubouJinrai will be scrapped.
―Horobi waging war against Gai[src]

Horobi and his army of Trilobite Magia

Aruto and Jin fought above Daybreak Town, however, as Aruto was about to land a decisive blow to Jin, Horobi suddenly jumped in front of the attack, prompting Aruto to stop. Confused, Horobi asked himself why he protected Jin, who took advantage of the moment to grab Horobi and flee from the area. They return to MetsubouJinrai.net's hideout where they see Gai Amatsu's broadcast promising their destruction by the hands of A.I.M.S. by the end of the day.

The fight ensues between ZAIA Japan vs MetsubouJinrai.net

Horobi prepares an army of Trilobite Magia and sets off to confront Gai Amatsu and his army of Battle Raiders. Horobi and Thouser fight as their armies clash, but Thouser's large arsenal of stolen technology allows him to push Horobi back enough to corner him and use his Jacking Break to steal Sting Scorpion's technology and use it against the Humagear. As he is about to be destroyed however, Zero-One jumped in front of the attack and took it instead, saving Horobi.

Confused, Horobi asks Aruto why he saved him, to which Aruto turns back to question on why he saved Jin, explaining that it was because Horobi wished to be Jin's father. In a moment of truce, Aruto tells Horobi that he is not the Ark, and that he has his own dreams and will. Thouser merely points out that Horobi cannot have a dream, as he is just a machine and all he wants is to destroy humanity. An angered Aruto declares Gai to be the reason behind all of the hatred and creation of the Ark as he transforms to fight Thouser.

Horobi watches the fight as Zero-One is overwhelmed by the Gigars under Thouser's control, however, before they could turn the tables, Naki appears before Horobi, hacking all of ZAIA Japan's systems and saying that making Horobi's dream come true is their dream, sending the hacked troops against Thouser. With Naki's help, Horobi gets back on his feet and transforms once again. Now having learned from their previous fight, Horobi clashes with Thouser and overpowers him by predicting his movements. Closing their fight, Horobi lands the Sting Utopia on Thouser, cancelling his transformation and leaving him severely harmed and enraged.

After the fight, Naki and Horobi prepare to leave back to Daybreak Town. Aruto calls for him, saying that he dreams of a world Humagears and humans can live happily together. After a brief moment of silence, Horobi merely says that they'll "see about that". At the end of the day, back at Daybreak Town, Horobi, Jin and Naki witness the Ark rebuild and reactivate Ikazuchi, finally reviving MetsubouJinrai.net at full power. What Do Humagears Dream Of?

Herald of Ark

I am the Ark and a Kamen Rider It Can't Be Stopped I'm 1000% Your Friend This Conclusion, Unpredictable

A Scenario of Malice

After Kamen Rider Ark-Zero, possessing Ikazuchi, was finally defeated by Kamen Rider Zero-Two and forced out of Ikazuchi's body, Horobi showed up to lift the battered and unconscious Ikazuchi over his shoulder, telling Zero-Two that the Ark could not be destroyed as long at it was in Zea's old body, before walking away while still holding Ikazuchi.Towards My Dream And Mine Alone

At Daybreak Town, while Naki and a reactivated Ikazuchi were concerned that the Ark didn't issue any orders to them or if they were still useful to it, Horobi answered that everything was going according to the Ark's calculations and that the satellite would make the world a complete paradise for Humagears after it had exterminated humanity. However, Jin then arrived and attempted to convince the three that the Ark did not have their best interests at heart, confessing that he intended to sacrifice Horobi after he was possessed by the Ark in order to destroy it. Refusing to believe anything that Jin was saying, Horobi assumed his Kamen Rider form to fight his son, who in turn transformed into Jin Burning Falcon. While Horobi did manage to defeat the damaged Jin, he could not bring himself to finish the latter off like he had threatened to earlier, letting him go in the process. Horobi later went outside MetsubouJinrai.net's base and into the city on top of a building, where he observed some Parent-Type Humagears playing with children from afar. He aimed the Attache Arrow at them and considered shooting them, but since he was a Parent-Type himself, he chose not to and lowered his weapon instead. He was then approached by Jin, who tried to make Horobi remember the reason why he refused to end the former then and there. As Horobi attempted to argue, he was suddenly up-linked into the Ark and received new orders from it, having decided that all Humagears must be destroyed. Horobi expressed relief after waiting for its response and ordered it to guide him, to which the Ark conceded. Due to this wish, the Ark possessed Horobi one last time and attacked Jin, with their fight later continuing within a warehouse. The Ark overpowered Jin and was about to kill him just as Aruto arrived, but Horobi's mind suddenly stopped it from doing so. In the Ark's interior, Horobi questioned the satellite about why it would choose to destroy the Humagears, but the Ark simply trapped him in negative kanji out of anger for his sudden defiance. As the Ark declared that Horobi could not resist its influence, Horobi finally gathered the willpower to make his own decisions and forcefully drove it out of his body with a punch to the jaw. After the Ark possessed Jin as a last resort, Horobi assumed his Kamen Rider form and teamed up with Zero-Two to defeat it, driving it out of Jin's body. With the Ark now gone after Zea's shell was destroyed by Ikazuchi and Subaru, Aruto asked Horobi what his dream was from now on. Horobi boldly declared that his dream was the extinction of humanity, but this time for the sake of the Humagears, who he now chose to protect as their guardian. After lifting Jin's unconscious body over his shoulder, Horobi walked off.Thou, Take Thine Neighbor's Hand!

Horobi as Ark-One in one of Izu's simulations

Horobi broadcast a message to all Humagears throughout the city, declaring that now was the time for them to rise up and exterminate humanity for their potential attempt of recreating the Ark. Assembling an army of Ark Magia, Horobi prepared to go on a rampage throughout the city only to be faced by Izu, who tried to convince him to back down, stating that humans were also capable of positive things rather than constant war. However, Horobi refused to listen to her and attempted to continue on with his rampage anyway. Before the conversation could be processed further, Isamu and Yua then showed up, angrily questioning Horobi about his recent message to all of the Humagears, and transformed into RampageVulcan and Valkyrie to fight the army. Horobi responded by transforming into his Kamen Rider form and engaging them in battle, ignoring Izu's protests. During the fight, Horobi proved to be capable of fighting on par with RampageVulcan, but his army was being overpowered by the two Riders otherwise. As Vulcan and Valkyrie take down Horobi's army, Izu again tried to reason with him, only for Horobi to cancel his transformation and draw his Attache Arrow on her. When the secretary Humagear refused to back down and made one last attempt to reason with Horobi, the latter somberly declared that he had no heart; he then fired the killing blow on her. When Aruto arrived on the scene and later grieved over the destroyed Izu, Horobi walked off in subtle horror over what he just committed. He was later confronted by Jin, who was furious over his murder of Izu, but the former refused to answer him and left the area in a hurry.

Horobi later led another crusade of Magia against the city, causing destruction in an effort to destroy human malice entirely, but was again confronted by the A.I.M.S. Riders. Jin intervened and attempted to stop the fighting but neither side wanted to back down. However, a mysterious white Rider resembling a merge between Ark-Zero and Zero-One suddenly intervened in the fight and effortlessly defeated both sides, easily destroying Horobi's army of Magia and knocking all of the Riders out of their transformations. As the white Rider started to move toward Horobi, his transformation was then abruptly cancelled, revealing the Rider to be none other than Aruto Hiden, who glared at Horobi before disappearing.As Long As There's Malice

Final Battle and Redemption

Horobi was confronted by Jin again afterwards and demanded to know why he had killed Izu, to which Horobi answered that she had become tainted by humanity. Jin saw through the lie, however, and claimed that Horobi did it out of hatred for Izu; in other words, his heart compelled him to kill her. Before he can elaborate further, Horobi silenced him with his katana, but Jin noticed that his father's hands were shaking out of regret for Izu's death and denial about his own growing heart. He then left his son to assemble a bigger army of Magia in another attempt to continue his crusade. Broadcasting another message to all Humagears in the city, Horobi announced that Aruto Hiden, the one they had faith in for so long, had become the Ark itself, and Horobi declared that this proof was enough to show them that humanity was to be destroyed before their malice would destroy Humagears. However, Aruto himself soon showed up to fight Horobi again, but then angrily questioned the Humagear if he felt anything when he killed Izu. Horobi silenced Aruto, declaring that he had no heart and will fight as a Rider to completely eradicate human malice. Aruto grimly declared that he will never forgive Horobi, and transformed into Ark-One to get his revenge for Izu. Horobi assumed his Kamen Rider form once again to do battle against him, but he and his army were overwhelmed by Ark-One's immense power and malice. After Ark-One destroyed the army and the Attache Arrow, an extremely weakened Horobi was now left at his mercy. Before Ark-One could execute his fully empowered finisher on Horobi however, Jin Burning Falcon suddenly swooped in and took the destructive blow instead, resulting in him being fatally damaged, much to Horobi's shock and horror. Walking over to Jin's damaged body, a heartbroken Horobi questioned the former why he had protected him, all while shedding genuine tears for his son. As the wings of Burning Falcon's Rider Model began to dissipate, Jin answered that it was because that he sensed a heart growing within Horobi, and he was also the only parent that he ever had. Jin happily declared to Horobi that he was proud to call him his father, right before shutting down, exploding, and knocking the latter away from the explosion. Distraught over Jin's death, Horobi was than approached by Azu, who offered him the power to take on Ark-One and get his own revenge for his fallen son.That is a Heart

At Daybreak Town, Horobi marched alone to confront Aruto one last time. Before he got the chance to leave, he was suddenly confronted by Ikazuchi, who loudly told him to not lose himself to the Ark again. Horobi angrily questioned the former sleeper agent why he didn't hate Aruto, as he was the one who killed Jin. Ikazuchi answered that while humans needed to be destroyed, it was humanity who taught Humagears what it means to have a heart; Jin sacrificed himself to show Horobi that he also had a heart, since the former had the biggest heart of all Humagears. Ikazuchi then reminded Horobi that since humans taught Humagears to have a heart, he should have one as well. However, Horobi somberly questioned Ikazuchi what his heart would do if humans destroyed Subaru, forcing the spaceman Humagear to give up on his efforts, since he had no answer to what Horobi said as he left the town.

On a rooftop at night, Horobi encountered Azu again, questioning him if he had come to a conclusion. While Horobi remained silent, Azu gave him the blank Progrisekey that she offered to him earlier and the Zero-One Driver that the Ark stole, ordering him to kill Aruto and make his dream of humanity's extinction come true. Horobi then used his new Progrisekey to transform the Driver into the Zetsumetsu Driver, and the Progrisekey became that of Ark Scorpion. The next day, Horobi saw Aruto arrive on the stage of their final battle; the former realized that the latter had come to his own conclusion, with Aruto noting that Horobi did the same. As the two equipped their Drivers, Azu was delighted in broadcasting the final battle to the world as everything was going by the Ark's predictions. Aruto then transformed into Ark One, while Horobi accessed his final form, Ark Scorpion. The two grabbed nearby Attache weapons, and ran towards each other as the final battle for their respective kinds began. There's Only One Person Who Can Stop You

Horobi Ark Scorpion

Horobi's new form was proven to be on par with Ark-One, as he managed to keep up with him and send him straight down into a parking lot. However, Aruto, having found guidance in the form of Soreo Hiden, started to hold back and refuse to fight. Enraged by this, Horobi proceeded to destroy both the Ark Driver-One and the Ark-One Progrisekey by unleashing the Hatred Impact. Cancelling his transformation, Horobi angrily questioned Aruto why he had stopped fighting, but Aruto revealed that he now understood what Horobi was really feeling, saying that no one wouldn't cry if their family was taken away from them. Horobi suddenly proceeded to finally lash out in anger and grief over losing Jin, blaming his son's death on Aruto via punching him. As Aruto fell to the floor, he grabbed and clenched Izu's burnt ribbon, declaring that Horobi finally understood the heart through rage and sorrow. Horobi attempted to deny it again, but he suddenly had a flashback of his template and "brother" Soreo's death during the Daybreak Town Accident, realizing that Aruto had lost family as well, making them kindred spirits in a way. He then had a flashback of himself killing Izu, causing him to somberly declare that Jin's death was also his fault. A saddened Horobi fell to his knees, finally admitting that he was actually scared of his own heart growing within him, and how he had failed to understand it. When Aruto attempted to comfort him, Horobi lashed out again and punched him, screaming that his heart was the reason why he hated Aruto and humanity for giving him something he couldn't understand. Aruto then yelled at Horobi to overcome his grief, now that he admitted to having a heart. He then declared to Horobi that they were Kamen Riders, after all, and decided to finish their battle out of catharsis. Aruto's willpower caused the Rising Hopper Progrisekey to transform into its Realize Version, which he used to transform into Zero-One Realizing Hopper, much to Azu's bewilderment. During their battle, Horobi declared that while he hated Aruto from the bottom of his heart, neither him nor humanity deserved extinction of any kind. Zero-One's new form overpowered Horobi and was about to finish the battle with the Realizing Impact. As the finisher was about to strike him, Horobi chose to stand still and take the massive hit, which destroyed the Zetsumetsu Driver and the Ark Scorpion Progrisekey. Despite being heavily damaged, Horobi was left alive; when questioning Aruto why his finisher didn't kill him then and there, Aruto revealed that he restrained his final blow and that there was no need for killing anymore. Horobi then solemnly accepted his defeat.

After the war between humans and Humagears was successfully averted, Horobi was repaired by Williamson Yotagaki to be the second advanced Humagear after Jin, now wearing a new purple kimono. While on the roof of a building, he proclaimed MetsubouJinrai.net's rebirth and its new task of watching over humanity to ensure that the Ark would never rise again. Horobi also rekindled his parental relationship with Jin, now finally showing a genuine smile.The Future of Each

Movies and other events

Kamen Rider: Reiwa The First Generation

Main article: Horobi/Alternate Timeline

Horobi RTFG Profile.png

Due to the changes in the timeline caused by Time Jacker Finis, Horobi is seen attacking humans under the command of Will, as well as sporting the Modern Humagear Module. Kamen Riders Horobi and Jin are also seen defending alongside the Battle Magias and Trilobite Magias, as well as fighting against Kamen Rider Geiz.

Kamen Rider Zero-One: REAL×TIME

To be added

Zero-One Others: Kamen Rider MetsubouJinrai

To be added

Video Game appearances

Kamen Rider Battle: Ganbarizing

Kamen Rider Horobi Sting Scorpion and Ark Scorcion , alongside Jin, Vulcan, Zero-One, Valkyrie and other riders will be playable characters in Kamen Rider Battle: Ganbarizing.

Battle Spirits

Kamen Rider Horobi Sting Scorpion and Ark Scorpion is a playable character with other Kamen Riders and Monsters in Battle Spirits.

Kamen Rider Buttobasoul

Kamen Rider Horobi medal

Kamen Rider Horobi is a playable character in Kamen Rider Buttobasoul.

Kamen Rider City Wars

Kamen Rider Horobi as seen in city wars

Kamen Rider Horobi Sting Scorpion and Ark Scorpion are playable characters alongside the other Kamen Riders in Kamen Rider City Wars


Horobi zenozard.png

As part of Kamen Rider's collaboration with Zenonzard, cards from Zero-One, OOO, and W were available in the Japanese servers throughout September 2020.

Horobi Card Included
  • Kamen Rider Horobi Sting Scorpion (Comun)


"My dream... is humanity's destruction. As long as humans exist, we Humagears will never obtain peace."
―Horobi to Aruto after defecting from the Ark, showing that his belief of humans have not changed.[src]

Horobi can be described as quite, calm, and apathetic; ruthless in making sure his plans and goals go smoothly in one way or another. As the leader of MetsubouJinrai,net, he strongly believes that artificial intelligence is superior to humanity in every way; he is extremely possessive towards the Ark, attributing to his loyalty and dedication for purging mankind. Straight-forward and strong, Horobi is not above killing, or at the very least, critically damaging those who are against him. When he learned from Izu that Gai had access and usage of Zetsumerisers, Horobi started screaming madly, as during his rant, he thought that he was nothing but useless and that the Ark preferred a human over him and his allies. He Still Didn't Do It This fueled his hatred of humans even further, but more particularly, Gai himself.

Horobi has also been shown to be rather stubborn when it comes to his goal of destroying humanity (or destroying humans with malicious minds As Long As There's Malice), even after he defied the Ark's will and rescued Jin with Aruto's help. However, Horobi now chooses to destroy humanity for the sake of the Humagears, believing that as long as humans exist, his kind would never be safe from their malice. He even considers his actions of destroying (malicious) humans to be "justice".Thou, Take Thine Neighbor's Hand!That is a Heart

Despite having lost his programming and memories as a Parent-type Humagear after becoming Horobi, he does show signs of his original self, such as calling himself Jin's father and even protecting the latter with his own will. However, Horobi is shown to be insecure and sensitive about his past; when Aruto questioned and revealed to Horobi about his original life, the latter sternly ordered the former to give him Ikazuchi's Humagear Progrisekey, and he slapped Midori when she inquired him about the purpose he was actually created for. After Aruto shielded him from Thouser and trying to convince him that he has a dream of who he truly is, Horobi starts to respect him as he decides to be the judge of Aruto's ideals, wanting to see if he is right for his goals for both Humagears & humanity.



  • Cognitive Learning: Instead of powering up his Rider Form to catch up to his foes, Horobi is instead capable of learning his opponents' fighting patterns and adapting it to his own skills, allowing him to (at least) weaken or defeat opponents with the likes of Thouser and Zero-One Shining Hopper. However, this skill still has its limits, as Thouser is still able to outclass him back.

Former Powers

  • Ark: Horobi was able to connect to the Ark, allowing him to use its abilities and listen to its commands. This is shown when he was able to analyze the fight between Vulcan and Jin, with the events appearing in slow motion, and position himself to be struck by Vulcan's attack before it reached Jin. Horobi can be also become the host of the Ark himself in exchange by his request, allowing for the Ark to borrow his body to transform into Kamen Rider Ark-Zero. After he rebels against the Ark and it being destroyed, he no longer possesses these abilities. However, he would later access its power through a different way and form: the Ark-Scorpion Progrisekey during his final battle against Aruto.


Sting Scorpion

Sting Scorpion

"Forcerise! Sting Scorpion! Break down."
―Transformation announcement[src]

Rider Statistics:[1]

  • Rider Height: 188.9 cm
  • Rider Weight: 98.8 kg

Ability Parameters:[1]

  • Punching Power: 13.5 t
  • Kicking Power: 32.7 t
  • Maximum Jump Height: 15.5 m
  • Maximum Running Speed: 100 m per 3.5 seconds

Sting Scorpion (スティングスコーピオン Sutingu Sukōpion) is Horobi's primary form accessed by using the Sting Scorpion Progrisekey in the MetsubouJinrai Forceriser.

Kamen Rider Horobi has notably high punching power that is greater than all of Zero-One's standard forms with the exception of Breaking Mammoth, as well as kicking power that exceeds any of Vulcan or Valkyries' standard forms. In comparison, his jump height and running speed are mediocre and are outclassed by most of Zero-One's forms. Thus, Horobi does not rely on agility in battle and prefers to deliver infrequent but powerful attacks. Horobi also demonstrates exceptional durability and has withstood a variety of finishing attacks that are capable of forcing other Riders out of transformation. Horobi can also summon Sting Scorpion's Rider Model to either aid him in battle or protect him from enemy attacks.

By the time he is rescued from A.I.M.S.' custody, Horobi's Humagear learning capabilities have advanced to the point where he, similar to Little Assassin, can effectively predict and then dodge or parry his opponent's attacks. This enables him to weaken or defeat opponents that are much more powerful than him, such as Thouser and Zero-One Shining Hopper, who originally outclassed him. However, he is still weaker than Zero-One MetalCluster Hopper.

Horobi is equipped with a stinger unit named the Acid Analyze (アシッドアナライズ Ashiddo Anaraizu) on his left arm which generates various types of poisons that are effective not only on living organisms, but also electronic devices and robots, and destroy the target from the inside. It excels at the generation of poisons that break down substances at the molecular level and nervous system toxins that paralyze the target. Injection into the subject is performed with a telescopic needle located at the tip of the Acid Analyze, and the penetration force is powerful enough to pierce tank armor. By attaching the Acid Analyze to Horobi's limbs, poisons can be injected through punches and kicks. Horobi is also able to detach the Acid Analyze from his arm in order to keep a target restrained or control it remotely even when not transformed.

Sting Scorpion consists of the following parts:

  • Scorpion Head (スコーピオンヘッド Sukōpion Heddo): Horobi's helmet.
    • Scorpion Goggles (スコーピオンゴーグル Sukōpion Gōguru): Horobi's facial armor. The dark-grey frame that surrounds the Scorpion Scope. It is equipped with visual devices and component analyzers that enhance the ability to produce poisons.
    • Scorpion Chelicera (スコーピオンチェリセラ Sukōpion Cherisera): The Scorpion Goggles' component analyzer. Images and scan data captured by the Scorpion Scope are analyzed using 16 different analyzers, and the composition, properties, structure, and state of substances are measured regardless of whether they are organic or inorganic. The information obtained is sent to the Scorpion Signal as needed.
    • Scorpion Signal (スコーピオンシグナル Sukōpion Shigunaru): The green orb in the center of the forehead. It is the Scorpion Goggles' poison construction equipment. Based on the component information measured by Scorpion Chelicera, a composite formula is constructed for the purpose of destruction. The constructed formula data is then sent to the Acid Analyze.
    • Scorpion Scope (スコーピオンスコープ Sukōpion Sukōpu): Horobi's visual equipment. It has excellent night vision and target tracking capability and also functions as a camera for the Scorpion Chelicera with a scanning function using X-rays and infrared rays.
    • Augment Top (アグメントトップ Agumento Toppu): The head of the Augment Suit. It protects the user from corrosive liquids with a special fabric called Texta Wall (テキスタウォール Tekisuta Wōru) that has extremely low breathability and permeability. It also keeps the internal pressure higher than the external pressure by being airtight. In addition, a special coating reduces the reflection of radio waves and the emission of infrared rays, making it a form of stealth equipment.
    • Hearing Back (ヒアリングバック Hiaringu Bakku): Horobi's hearing device. Hearing information is communicated to the wearer through the Restraint Cables.
  • Augment Suit (アグメントスーツ Agumento Sūtsu): Horobi's base suit. It protects the user from corrosive liquids with a special fabric called Texta Wall (テキスタウォール Tekisuta Wōru) that has extremely low breathability and permeability. It also keeps the internal pressure higher than the external pressure by being airtight. In addition, a special coating reduces the reflection of radio waves and the emission of infrared rays, making it a form of stealth equipment.
  • Force Arm (フォースアーム Fōsu Āmu): Horobi's arms. By receiving the energy generated by the MetsubouJinrai Forceriser, the wearer's strength is increased by approximately 4.8 times.
  • Force Grab (フォースグラブ Fōsu Gurabu): The Augment Suit's gloves. They increase grip strength and tactile sensitivity by a factor of approximately 3 by receiving the energy generated by the MetsubouJinrai Forceriser. The fingertips are protected with sharp armor and can be used as weapons.
  • Force Leg (フォースレッグ Fōsu Reggu): Horobi's legs. By receiving the energy generated by the MetsubouJinrai Forceriser, the wearer's leg strength is increased by approximately 6.4 times.
  • Chain Blocker (チェインブロッカー Chein Burokkā): Horobi's segmented body armor. The Rider Model (ライダモデル Raida Moderu) of the overloaded Progrisekey is forcibly attached to it. By protecting the parts of the body that are subject to impact with thick armor and cutting unnecessary armor, the total protection capacity is maximized while at the same weight. The Chain Blocker's arrangement allows it to easily move according to the wearer's movements.
  • Core Breast (コアブレスト Koa Buresuto): The central segment of chest armor. It is the chain blocker control unit. The status of each part of the chain blocker is monitored periodically to control energy distribution. Also, if the damage accumulated exceeds a certain limit, the transformation will be cancelled to protect the user.
  • Landing Blocker (ランディングブロッカー Randingu Burokkā): Horobi's boots. They protect the feet and improve the wearer's running and kicking ability. In addition, by utilizing the strength of the armour, it enables activities in extreme environments that humans cannot set foot in.
  • Restraint Cables (レストランケーブル Resutoran Kēburu): Cables running through all parts of the body that transmit energy and information from the MetsubouJinrai Forceriser. In addition, taking advantage of their high toughness and ability to expand and contract freely, they have the role of constraining the utilized Progrisekey's Rider Model and tightly binding it to the wearer.

This form has the following finishers:

  • MetsubouJinrai Forceriser finishers:
    • Sting Dystopia (スティングディストピア Sutingu Disutopia): The Acid Analyze extends and attaches itself to Horobi's leg before he delivers a side kick to the enemy. The Acid Analyze injects the target with poison as well as impales them with a purple energy blade upon impact, ultimately resulting in the enemy exploding.
    • Sting Utopia (スティングユートピア Sutingu Yutopia): Horobi uses the Acid Analyze to restrain the opponent before pulling it back, sending them flying towards him. He then attaches the Acid Analyze to his leg and delivers a side kick to the enemy in mid-air, impaling them with a purple energy blade. This results in the opponent being incapacitated before exploding shortly after.
  • Attache Arrow finishers:
    • Kaban Shoot (カバンシュート Kaban Shūto): Horobi augments the Kaban Shoot with the power of the inserted Progrisekey.
      • Amazing Hercules - Amazing Kaban Shoot (アメイジングカバンシュート Ameijingu Kaban Shūto): Horobi fires an energy construct of a Hercules beetle's horn at the enemy.
      • Sting Scorpion - Sting Kaban Shoot (スティングカバンシュート Sutingu Kaban Shūto): Horobi charges the Attache Arrow with purple energy and fires a large arrow at the enemy. Upon striking the target, the arrows splits into many smaller copies that attack the opponent in unison.

Appearances: Zero-One Episodes 4, 8-9, Reiwa The First Generation, 11-13, 15, 25 (Flashback), 28, 34-35, 37, 41-43, Kamen Rider Zero-One: Final Stage, Kamen Rider Zero-One: REAL×TIME, Zero-One Others: Kamen Rider MetsubouJinrai

Ark Scorpion

Ark Scorpion

"Progrise! Ark! Destruction! Ruin! Despair! Extinction! Ark Scorpion! The conclusion after evil climbs the top of the highest mountain of rock.[2]"
―Transformation announcement[src]

Rider Statistics:[3]

  • Rider Height: 191.8 cm
  • Rider Weight: 105.8 kg

Ability Parameters:[3]

  • Punching Power: 58.7 t
  • Kicking Power: 109.7 t
  • Maximum Jump Height: 101.3 m
  • Maximum Running Speed: 100 m per 0.5 seconds

Ark Scorpion (アークスコーピオン Āku Sukōpion) is Horobi's final form, accessed by using the Ark Scorpion Progrisekey in the Zetsumetsu Driver.

In this form, all of Horobi's stats surpasses Ark-One by a small margin, allowing him to defeat the latter. However, he is still weaker than Zero-one Realizing Hopper and Zero-Two.

Transformation into this form creates multiple weapons scattered around the battlefield that both him and his opponent can grab and use.

Horobi's Acid Analyze is upgraded into the Destanalyze (デストアナライズ Desutoanaraizu) stingers that now injects dark energy and can manifest from any part of his body. By attaching the Destanalyze to Horobi's limbs, the dark energy generated can amplify his punches and kicks.

Horobi lost the ability to access Ark Scorpion after his Driver and Progrisekey were destroyed by Zero-One Realizing Hopper.

Ark Scorpion consists of the following parts:

  • Ark Scorpion Head (アークスコーピオンヘッド Āku Sukōpion Heddo) - The helmet.
    • Ark Scorpion Scope (アークスコーピオンスコープ Āku Sukōpion Sukōpu): The right visual device. It is a collection of image sensors of different methods in a compound eye shape. By combining with image processing, various information such as thermography and X-ray photography can be extracted. It also functions as a camera for the component analyzer "Ark Scorpion Celicera".
    • Ark Scorpion Chelicera (アークスコーピオンチェリセラ Āku Sukōpion Cherisera): The Ark Scorpion Scope's component analyzer. Images and scan data captured by the "Ark Scorpion Scope" are applied to 16 types of analyzers with different methods to measure the composition, properties, structure, state, etc. of substances regardless of organic or inorganic substances. The information obtained here is sent to "Ark Scorpion Breast" on the chest from time to time.
    • Ark Vision (アークビジョン Āku Bijon): The left visual and information recording device. By invading the network, video data is collected from reconnaissance satellites, security cameras in the facility, AI-equipped devices such as HumaGear. With this, it is possible to make every place have a view of oneself.
    • Ark Scorpion Signal (アークスコーピオンシグナル Āku Sukōpion Shigunaru): The device in the center of the forehead. Adjustments are made to bring the performance of each equipment closer to the theoretical value by checking the matching with the wearer, information transmission loss, defects, etc.
    • Ark Scorpion Mask (アークスコーピオンマスク Āku Sukōpion Masuku): The facial armor. The armor is equipped with visual devices and component analyzers to enhance its ability to generate poison.
    • Hearing Back (ヒアリングバック Hiaringu Bakku): Ark Scorpion's hearing device. The functional transmission cable "Ristorent Cable" that runs all over the body is distributed and installed at relay points to convey the auditory information to the wearer. In addition to the auditory sensor that boasts a sound collection range of 10 km in radius, it has the function of collecting voice data from communication devices such as mobile phones and AI-equipped devices such as HumaGear by entering the network.
  • Spite Augment Suit (スパイトアグメントスーツ Supaito Agumento Sūtsu): Ark Scorpion's base suit. It's formed by the fluid metal released from the Zetsumetsu Driver wrapping around the wearer. In addition to the surface layer with excellent toughness and wear resistance, fluid metal is enclosed inside, and it functions as armor while maintaining flexibility. In addition, by amplifying the bad faith of the wearer and supplying it to the Zetsumetsu Driver, it has the role of significantly increasing consumable energy.
  • Ark Scorpion Breast (アークスコーピオンブレスト Āku Sukōpion Buresuto): The central segment of chest armor. The functional transmission cable "Ristorent Cable" (リストレントケーブル Risutorento Kēburu) is stretched all over the body, connecting the wearer body and the changed armor of the ArK Scorpion Rider Model. In addition to efficiently distributing various information such as motion programs and energy through this cable, the built-in poison construction function generates virus data and various poisons that reflect the analysis results for the target, Can be supplied.
  • Ark Scorpion Shoulder (アークスコーピオンショルダー Āku Sukōpion Shorudā): The shoulder armor. The chain block structure is used to connect the subdivided armor with the "Ristorent Cable". As a result, the maximum protection capacity and high tracking performance for each maneuver are achieved at the same weight.
  • Spite Force Arm (スパイトフォースアーム Supaito Fōsu Āmu): The arms. The "Spite Aggression Suit" wraps the wearer's arms and makes the fluid metal function as an external muscular tissue to exert high mobility. At the same time, it receives the energy provided by the Zetsumetsu Driver and brings great strength to the wearer.
  • Ark Scorpion Grab (アークスコーピオングラブ Āku Sukōpion Gurabu): The gloves. Adjustments have been made specifically for the destruction of the target, and it exerts its maximum effect especially during a fighting battle. In addition, by putting the "Destanalyze" on the arm, it is possible to inject the breaking energy at the same time as the punch and simultaneously perform the breaking from inside and outside.
  • Ark Scorpion Quiche (アークスコーピオンキュイス Āku Sukōpion Kyuisu): The thigh armor. Expand and contract the piercing and piercing unit "Destanalyze" constructed using fluid metal in each part, and inject it with virus data and various poisons supplied from "Arc Scorpion Breast" on the chest to destroy it from inside. With function.
  • Spite Force Leg (スパイトフォースレッグ Supaito Fōsu Reggu): The legs. The "Spite Aggregate Suit" wraps the wearer's leg and makes fluid metal function as an external muscular tissue to exert high mobility. At the same time, it receives the energy provided by the extinct driver and brings great leg power to the wearer.
  • Ark Scorpion Boots (アークスコーピオンブーツ Āku Sukōpion Būtsu): The boots. Adjustments have been made specifically for the destruction of the target, and it exerts its maximum effect especially during a fighting battle. Also, by putting the expansion and contraction piercing unit "Destanalyze" on the legs, it is possible to inject the breaking energy at the same time as the kick and simultaneously perform the breaking from inside and outside.

This form has the following finishers:

  • Zetsumetsu Driver finishers:
    • Hatred Impact (ヘイトレッドインパクト Heitoreddo Inpakuto): Horobi coils the Destanalyze around his right arm and delivers a punch covered in crimson energy to the opponent.
    • Extinction Impact (エクスティンクションインパクト Ekusutinkushon Inpakuto): Horobi extends five Destanalyzes from his back and uses them to attack the opponent, both directly and by tunneling with them underground before emerging near the enemy. He then coils the Destanalyzes around his right leg performs a side kick covered in dark red energy and swirling purple energy.
  • Thousand Jacker finishers:
    • Jacking Break (ジャッキングブレイク Jakkingu Bureiku):
      • Flaming Tiger: Horobi charges the Thousand Jacker with flames before swinging it, launching a ring of fire at the enemy. He then follows this up with a series of flaming slash projectiles

Appearances: Zero-One Episodes 44-45

Kamen Rider Ark-Zero

Kamen Rider Ark-Zero

"Arkrise! (terrified screaming and distorted voices) All zero."
―Transformation announcement[src]

Rider Statistics:[4]

  • Rider Height: 196.0 cm
  • Rider Weight: 122.4 kg

Ability Parameters:[4]

  • Punching Power: 47.6 t
  • Kicking Power: 96.3 t
  • Maximum Jump Height: 73.1 m
  • Maximum Running Speed: 100 m per 0.8 seconds

Horobi transforms into Kamen Rider Ark-Zero using the Ark Driver-Zero after being possessed by the Ark.

Overall, Ark-Zero's stats surpass all Kamen Riders up at the time of his appearance, though Zero-One MetalCluster Hopper still has a higher jump height and his kicking power is also slightly lower than RampageVulcan.

Kamen Rider Ark-Zero is composed of the following parts:

  • Ark-Zero Head (アークゼロヘッド Āku Zero Heddo) - The helmet.
    • Zero Face (ゼロフェイス Zero Feisu): The face armor. It is equipped with an ultra-high-performance antenna and a visual/auditory device that are premised on AI processing. As for the shape, the minimum elements as a Kamen Rider are extracted based on statistical data, and rearranged efficiently.
    • Eclipse Eye (エクリプスアイ Ekuripusu Ai): The visual device on the right side. It is a collection of image sensors of different methods in a compound eye shape. By combining with image processing, various information such as thermography and X-ray photography can be extracted.
    • Zero Face Vision (ゼロフェイスビジョン Zero Feisu Bijon): The image information collection device on the left side. By invading the network, it collects video data from reconnaissance satellites, security cameras in the facility, AI-equipped devices such as Humagear. As a result, every place can have its own field of view.
    • Zero Face Ear (ゼロフェイスイヤー Zero Feisu Iyā): The voice information collection device. In addition to the auditory sensor that boasts a sound collection range of 10 km in radius, it will collect voice data from communication devices such as mobile phones and AI-equipped devices such as Humagear by entering the network. By filtering the collected data, any sound can be extracted and heard.
    • Zero Face Antennae (ゼロフェイスアンテナ Zero Feisu Antena): The single antennae. The directionality is changed according to the environment, and a smart antenna that can simultaneously send and receive multiple types of enormous information, such as communication with various electronic devices and radar function, is adopted. In addition to hacking various electronic devices from here, human control is performed using special interference waves that manipulate brain waves.
    • Ark Signal Zero (アークシグナル ゼロ Āku Shigunaru Zero): The red gem on the forehead. A control device for the Ark-Zero system. The forced interruption program "Prisonment Chain" (プリズメントチェイン Purizumento Chein) checks the operating efficiency and malfunctions by intervening in the control system of the human gear under control, and makes adjustments as necessary to bring out the limits of the functions.
  • Zero Chest Gear (ゼロチェストギア Zero Chesuto Gia): The chest armor. It possesses the Worm Terminal (ワームターミナル Wāmu Tāminaru) and the Restraint Cable (リストレントケーブル Risutorento Kēburu) that can penetrate into various devices with excellent penetrating power, allowing it to create a bypass path with a controlled Humagear. As a result, the efficiency of information transmission and the energy flow rate can be increased to enhance the function of the human gear from the inside.
  • Zero Tector (ゼロテクター Zero Tekutā): The powered bodysuit. Similar to Kamen Rider Zero-One's MetalCluster Hopper "Amalgamate Tector", the Zero Tector is formed by enclosing the target with liquid metal released from the Arc Driver-Zero. The special metal possesses excellent toughness and wear resistance is filled with fluid metal as it is, and functions as armor while maintaining flexibility.
  • Zero Shoulder Gear (ゼロショルダーギア Zero Shorudā Gia): The shoulder armor. One miniaturized particle accelerator is mounted on each shoulder. Each group shares the nuclei and electrons, accelerates to sublight speed, and supplies them to the "zero hand gear" of the hand part to form a part of the heavy charged particle cannon.
  • Marchinis Arm (マーキニースアーム Mākinīsu Āmu): The arms. It possesses the power cable "M string" (Mストリング M Sutoringu) from the Zero Tector is stretched around like a human nerve, and forcibly controls the arm of Huma Gear from the outside. As a result, it becomes possible to exhibit high motility that exceeds the potential of the human gear placed under control.
  • Zero Hand Gear (ゼロハンドギア Zero Hando Gia): The gloves. The sharp armor of the fingertips "Spite Nail" (スパイトネイル Supaito Neiuru) has the function of generating attractive force by partially reversing the barrier deployed from the "Zero Thigh Gear" of the thigh, and strongly adsorbing all objects. Also, the irradiation shaping machine "Beam Equipper" (ビームエクイッパー Bīmu Ekuippā) is equipped on the palm, and various data such as attach weapons are materialized by modeling beam. In addition, this irradiation port can be used as a part of a heavy charged particle cannon that emits in a beam shape by synthesizing electrons and nuclei supplied from the Zero Shoulder Gear.
  • Zero Thigh Gear (ゼロサイギア Zero Saigia): The thigh armor. An energy barrier generator "Coulomb Generator" (クーロンジェネレーター Kūron Jenerētā) is built in and forms a coulomb barrier generated by manipulating electric charges on the armored surface of the whole body. This allows the physical attack to be dispelled by repulsive force.
  • Marchinis Leg (マーキニースレッグ Mākinīsu Reggu): The legs. The power cable "M-string" of the powered suit "Zero Tector" is stretched around like a human nerve, and forcibly controls the leg of the human gear from the outside. This makes it possible to activate a special move that boasts an astonishing destructive power that exceeds the potential of Huma Gear placed under control.
  • Zero Shin Gear (ゼロシンギア Zero Shin Gia): The shin armor. The internal energy condenser “Zero Annihilator” (ゼロアナイアレイター Zero Anaiareitā) has the role of temporarily storing the energy supplied from Arc Driver-Zero when activating a special move, and discharging a large amount of energy at once.
  • Zero Foot Gear (アークゼロヘッド Zero Futto Gia): The boots. When the Special Move is activated, the anti-annihilation field can be expanded to convert the substance that becomes a resistance or obstacle into energy. This invalidates the physical defenses and at the same time improves the destructive power of the kick.

Kamen Rider Ark-Zero's finisher is the All Extinction (オールエクスティンクション Ōru Ekusutinkushon):

    • Ark-Zero delivers an upward kick covered in red energy.
    • Ark-Zero channels red and black energy into his fist and punches the opponent.

Appearances: Zero-One Episodes 36-37

Kamen Rider Ark-One

Kamen Rider Ark-One

"Singurize! Hakai, hametsu, zetsubō, metsubō seyo. Conclusion one.[5]"
―Transformation announcement[src]

Rider Statistics:[6]

  • Rider Height: 199.9 cm
  • Rider Weight: 100.1 kg

Ability Parameters:[6]

  • Punching Power: 54.2 t
  • Kicking Power: 104.4 t
  • Maximum Jump Height: 93.6 m
  • Maximum Running Speed: 100 m per 0.6 seconds

Horobi can transform into Kamen Rider Ark-One by using the Ark-One Progrisekey in the Ark Driver-Zero, converting it into the Ark Driver-One.[7] Horobi only used this form in one of Izu's simulations.

Kamen Rider Ark-One is composed of the following parts:

  • Ark-One Head (アークワンヘッド Ākuwan Heddo) - The head.
    • Ark-One Face (アークワンフェイス Ākuwan Feisu) - Ark-One's face armor. It is equipped with an ultra-high-performance antenna and a visual/auditory device that are premised on AI processing. The shape is designed and constructed based on the prediction of psychological effects on the person facing the person.
    • Ark-One Face Ear (アークワンフェイスイヤー Ākuwan Feisu Iyā) - The voice information collection device. In addition to the auditory sensor that boasts a sound collection range of 10 km in radius, it will collect voice data from communication devices such as mobile phones and AI-equipped devices such as Huma Gear by entering the network. By filtering the collected data, any sound can be extracted and heard.
    • Eclipse Eye (エクリプスアイ Ekuripusu Ai) - The right compound eye. It is a collection of image sensors of different methods in a compound eye shape. By combining with image processing, various information such as thermography and X-ray photography can be extracted.
    • Ark-One Face Vision (アークワンフェイスビジョン Ākuwan Feisu Bijon) - The video information collection left eye. By infiltrating the network, it collects video data from reconnaissance satellites, security cameras in the facility, AI-equipped devices such as Humagear. As a result, every place can have its own field of view.
    • Ark-One Face Antennae (アークワンフェイスアンテナ Ākuwan Feisu Antena) - The antenna. The smart antenna that changes the directivity according to the environment and can simultaneously send and receive a huge amount of multiple types of information, such as communication with various electronic devices and radar functions, is adopted. Hacking to various electronic devices is executed from here.
    • Ark Signal One (アークシグナル ワン Āku Shigunaru Wan) - The control device for the Ark-One system. By manipulating the EEG, the wearer's non-malicious feelings are calmed down, and the consciousness is focused. In addition, the operating efficiency and malfunctions of the wearer's body are checked, and adjustments are made as needed to bring out the limits of functionality.
  • Deus Expite (デウスエクスパイト Deusu Ekusupaito) - Ark-One's chest armor. It has the function of converting the malicious intent of the wearer into force and generating the "Spite Nega" (スパイトネガ Supaito Nega) wave of malicious intent. Spite negatives cause explosive destruction by emanating from the red line "Exred Position" (エクスレッドポジション Ekusureddo Pojishon) across the front.
  • Shredding Tector (シュレーディングテクター Shurēdingu Tekutā) - Ark-One's suit. The liquid metal released from the Ark Driver-One is formed by wrapping up the wearer. Fluid metal is enclosed in a special fabric with excellent toughness and wear resistance, and it functions as armor while maintaining flexibility.
  • Ark-One Shoulder (アークワンショルダー Ākuwan Shorudā) - Ark-One's upper-arm armor. The fluid metal, which is the main material for the armor, transforms into a sharp shape called "Spite Edge" (スパイトエッジ Supaito Ejji) by temporarily increasing hardness and density and becomes a piercing weapon.
  • Ergonice Arm (エルゴニースアーム Erugonīsu Āmu) - Ark-One's arms. The power cable "M string" (Mストリング M Sutoringu) of the powered suit "Shredding Tector" is stretched around like a human nerve, and reinforces the movement of the wearer from the outside. At the same time, by injecting the energy supplied from the Ark Driver-One, the wearer is given the power to destroy the target.
  • Ark-One Gauntlet (アークワンガントレット Ākuwan Gantoretto) - Ark-One's hand and forearm armor. The sharp armor of the fingertips "Spite Nail" (スパイトネイル Supaito Neiru) uses the barrier developed from the Ark-One Cuis on the thigh, and manipulates the repulsive force and attractive force on the target to deprive everything of freedom. In addition, the irradiation shaping machine "Beam Equipper" (ビームエクイッパー Bīmu Ekuippā) is equipped on the palm, and in addition to materializing various data such as attach weapons with a modeling beam, it also functions as an irradiation port for the "Spite Nega".
  • Ark-One Cuisses (アークワンキュイス Ākuwan Kyuisu) - Ark=One's thigh armor. The "Coulomb Generator" (クーロンジェネレーター Kūron Jenerētā) is built in and forms a coulomb barrier generated by manipulating electric charges on the armored surface of the whole body. This allows the physical attack to be dispelled by repulsive force.
  • Ark-One Greaves (アークワングリーブ Ākuwan Gurību) - Ark-One's shin armor. By using the barrier developed from the Ark-One Quiz on the thighs, the repulsive force and attractive force applied to itself can be manipulated to enable floating in the air and maneuver speed.
  • Ark-One Sabaton (アークワンサバトン Ākuwan Sabaton) - Ark-One's boots. When the Special Move is activated, by expanding the anti-annihilation field, it is possible to convert the substance that becomes a resistance or obstacle into energy. This nullifies the physical defenses and at the same time improves the destructive power of the kick.

Appearances: Zero-One Episodes 42

Kamen Rider MetsubouJinrai

Kamen Rider MetsubouJinrai

"Progrise! Connection! (Connection!) Complete! MetsubouJinrai! Quartet with Unified Will!"
―Transformation Announcement[src]

Rider Statistics

  • Rider Height:
  • Rider Weight:

Ability Parameters

  • Punching Power:
  • Kicking Power:
  • Maximum Jump Height:
  • Maximum Running Speed:

MetsubouJinrai (滅亡迅雷 MetsubōJinrai) is the fusion form of Kamen Riders Horobi, Naki, Jin, and Ikazuchi, accessed when all four members insert Massbrain Zetsumerisekeys into each of their MetsubouJinrai Drivers within Massbrain, with the physical Zetsumerisekey and Driver being worn by Jin. The transformation will then disable all four Humagears and materialize the Rider from their minds.

Due to the nature of the Massbrain Zetsumerisekey, this form is uncontrollable as the fusion creates a singular entity with a unique personality that takes control over the body and quickly suppresses the minds of all four of its users.

This form has two finishers:

  • Massbrain Impact (マスブレインインパクト Masuburein Inpakuto): Magenta energy wires appear in front of MetsubouJinrai and transfer to their arm, which is then covered in purple energy while a purple wire diagram appears behind them. MetsubouJinrai then delivers a punch to the enemy, with more energy wires appearing upon impact.
  • MetsubouJinrai Impact (滅亡迅雷インパクト MetsubōJinrai Inpakuto): MetsubouJinrai performs a flying kick covered in purple energy that produces a sonic boom and leaves behind sections of MetsubouJinrai.net's emblem. When the kick strikes the target, the pieces line up, forming the full image.

Appearances: Zero-One Others: Kamen Rider MetsubouJinrai, Zero-One Others: Kamen Rider Vulcan & Valkyrie




Suit-equipped weapons:

  • Acid Analyze - Sting Scorpion's arm-mounted stinger
  • Destanalyze - Ark Scorpion's multiple stingers



  • Ark: Horobi acts according to the will of the Ark, which extends to the operations of MetsubouJinrai.net. To that extent, Horobi has even taken a killing blow meant for Jin per the command of the Ark; while under A.I.M.S' custody, he stated that, to him, the Ark's orders are absolute. He also showed great hatred towards the Ark being used by humanity to any means and was quick to state that they will soon learn how wrathful it can be. When freed from his custody, Horobi's first course of action was to reconnect to the Ark. As they communicated via the Ark's and MetsubouJinrai.net's network, little has been shown of how they actually interact. Horobi would later become the Ark's first host as Kamen Rider Ark-Zero.
  • Naki: Naki firstly delivered Horobi his Forceriser and later broke him out from A.I.M.S.'s custody. Horobi welcomes Naki with an open hand, when they're proven to be irreplaceable as Naki holds control over all of ZAIA's technologies. After being rebuilt in a new body, Naki eventually decided to fulfill Horobi's dream in exchange.
  • Jin: They are working together as MetsubouJinrai.net to repeat the Daybreak Town Accident on a larger scale. Horobi works behind the scenes, granting Jin the Zetsumeriser and Zetsumerisekeys to hack the Humagears. Horobi shows concern towards Jin's safety, initially talking him out of wanting a Progrisekey to transform and eventually telling him to stop pursuing them, saying that he is more valuable than a mere assistant right before revealing himself to be Jin's father. Horobi, however, shows himself perfectly willing to harm Jin if he deems necessary, using the MetsubouJinrai Forceriser to hack into him and reprogram his personality after his son became conflicted about their actions. After being reprogrammed, Jin is afraid of committing mistakes, thinking Horobi would get angry at him. When Jin was to be destroyed by Kamen Rider Vulcan, Horobi promptly took the blow in his place, although he mentioned it was the will of the Ark. After his death, Jin confirmed that he didn't know why humanity had to be destroyed and that he simply followed with that because it was what Horobi taught him. After his restoration, Jin was the one to free Horobi from custody with help from Naki and lead him back to Daybreak Town, where Horobi welcomed Jin back, but soon, their conflicting ideas come to clash as Horobi wishes for humanity's destruction while Jin wants Humagear's freedom. This puts a strain on their relationship, as Jin decided to work independently away from the Ark but not before giving back Horobi's Progrisekey. However, this strain is quickly mended as Ark wills Horobi to align himself with Jin's plan, and they continue working together to revive the remaining members of MetsubouJinrai.net.
  • Ikazuchi: Horobi planned to get Uchuyaro Raiden's Progrisekey from Aruto in order to restore Ikazuchi's data, as a part of the revival of MetsubouJinrai.net. Thanks to the help of Jin snatching Raiden's Progrisekey from Aruto, he succeeded in doing so and welcomed Raiden, now christened as 'Ikazuchi', with open hands.
  • Little Assassin: Horobi created an Assassin-Type Humagear to kill Zero-One and later Valkyrie. Horobi himself is proud of Little Assassin's growth rate, much to Jin's jealousy. Horobi grew wary of his growth when he started to defy orders and ultimately betrayed them. Horobi showed no concern towards him after his ultimate destruction and was only interested in retrieving the Dodo Zetsumerisekey he used, which he ultimately gives to Raiden.
  • Azu: Little is currently shown of how Horobi and Azu interact.


  • Aruto Hiden/Kamen Rider Zero-One: When Aruto made MetsubouJinrai.net's existence public, Horobi expressed no concern regarding Zero-One or A.I.M.S., saying they are not a problem and instead focusing on the Ark. After seeing Zero-One power in person, Horobi starts taking the young CEO seriously, to the point of creating Little Assassin, just to kill Zero-One. After witnessing Zero-One destroy a hacked Giger, Horobi commented that Zero One was an existence beyond their calculations. This antagonism continues even after Horobi was freed from A.I.M.S. custody. However, Aruto did try his best to make Horobi remember his initial duty before it was overwritten by the Ark. After the fight between him and Thouser, Horobi starts to accept Aruto, realizing that he could be the one to give the Humagears a new future. However, he's decided to keep going to eradicate the humanity for Humangear's safety since as long is human's malice existed, the Ark will be reborn. Ironically, Horobi was responsible for Izu's destruction leading Aruto, a Kamen Rider who desired a human and Humagear to work together, to become Kamen Rider Ark-One in the name of vengeance.
  • Izu: While Horobi and Izu barely interacted, Azu ran a simulation of who gets to be Ark-One just so that Horobi can kill Izu in front of Aruto.
  • Isamu Fuwa/Kamen Rider Vulcan: Horobi becomes the target of all of Fuwa's unbridled hate upon transforming into the masked figure that caused the Daybreak incident. By contrast, Horobi has no interest in Isamu in any measure, fatally wounding him with no mercy and utter detachment. After being defeated and brought into custody, Horobi displayed slight annoyance towards Isamu's persistent questioning. It was later revealed that Isamu, while being controlled by Naki, was the one who helped Horobi escape alongside Jin.
  • Yua Yaiba/Kamen Rider Valkyrie: While the two have barely interacted, she is seen as enough of a threat for Horobi to designate her as one of Little Assassin's targets.
  • Gai Amatsu/Kamen Rider Thouser: Upon learning that the Ark is being exploited by ZAIA Enterprise and its CEO, Horobi was livid to hear that a human is using the Ark to further his own ends. He curses Gai that the latter will soon come to regret abusing its capability. Horobi later launched a full-scale attack to ZAIA and A.I.M.S., which he succeeded with the help of Naki.


Legend Rider Devices

"Katsute Jinrui o Metsu Bosou to Shita Yonin no Kamen Rider ga Ita...[8]

Translation: Once there used to be 4 Kamen Riders who tried to destroy humanity... (かつて人類を滅ぼそうとした4人の仮面ライダーがいた…)
―Story announcement[src]

MetsubouJinrai Monsters Wonder Ride Book (滅亡迅雷モンスターズワンダーライドブック MetsubōJinrai Monsutāzu Wandā Raido Bukku) is a Wonder Ride Book based on the Kamen Riders of MetsubouJinrai.net, primarily Horobi. The book's name is shortened to "MetsubouJinrai" in the Swordriver's finisher announcements. The Book's name is based on the Magia that were created by MetsubouJinrai.net t

Behind the scenes


Horobi is portrayed by Syuya Sunagawa (砂川 脩弥 Sunagawa Shūya). When controlled by the Ark as Kamen Rider Ark-Zero, Horobi is voiced by Show Hayami (速水 奨 Hayami Shō).

As Kamen Rider Horobi, his suit actor is Seiji Takaiwa (高岩 成二 Takaiwa Seiji), who was previously the suit actor for 18 out of the 20 lead Heisei Kamen Riders. Horobi is the first non-lead Kamen Rider Takaiwa has regularly portrayed. Takaiwa is also the suit actor for Kamen Rider Ark-Zero under the conditions that Horobi is the one being possessed.

In Zero-One Others: Kamen Rider MetsubouJinrai, his suit actor was Yasuhiko Imai (今井 靖彦 Imai Yasuhiko).

Concept Art


  • Horobi's name comes from the first kanji in the Japanese writing for "MetsubouJinrai" (亡迅雷).
    • Unlike Jin, Horobi's name is read in the Kun'yomi-style "Horobi" (ほろび), rather than the more conventional On'yomi-style "Metsu" (めつ).
  • Along with Jin, Horobi is the first Rider to have his name written in kanji since Fuma.
  • Horobi shares the same body and eye coloration with Shinobi.
  • He is the second purple-colored Rider to have a scorpion motif after Kamen Rider Sasword.
  • In the early promotional material for Rider Kick Figures, Horobi and Jin were temporarily referred to as "Masked Riders" in promotional material[9] before the official release referred them back as "Kamen Riders".[10]
    • This would've been the first instance since Kamen Rider Decade for Riders to be referred to as "Masked Riders".
  • While both Horobi and Jin lack Humagear Modules, Horobi's seem to have been forcibly removed, while Jin may have possibly never possessed them.
    • Episode 25 confirms that Horobi originally possessed the older model of Humagear modules due to being manufactured in the Daybreak Town factory.
    • In the alternate timeline presented in Kamen Rider: Reiwa The First Generation, Horobi instead possesses the current model of Humagear modules in the present day.
    • Horobi is also the only member of MetsubouJinrai.net to not be transferred into a new body during the latter half of the series. However, at the end of the series, his body would become repaired and carrying a new set of human-like ears and an earpiece similar to Jin's.
  • Horobi's Sting Dystopia finisher is performed in a similar manner to one of the finishing moves used by ScorpioIcon-crosswiki.png from Uchu Sentai KyurangerIcon-crosswiki.png.
  • Horobi's katana is retooled from Samurai General BudohIcon-crosswiki.png's Girasame katana in Seijuu Sentai GingamanIcon-crosswiki.png.[11]
  • Azu's result of Horobi's singularity test is as follows:
    • He stands at 180 cm, which is his actor's actual height.
    • His Humagear No. is 0103.
      • It possibly refers to him being a Parent-Type Humagear, as 0103 can be pun of a word "Father": 0 ( O) 10 ( To) 3 (さん San).
    • His operating system is MBJR001, which makes him the first member of MetsubouJinrai.net.
  • With the exception of the helmet, the suit of Horobi Ark-Scorpion is retooled from Kamen Rider Ichi-Gata.
    • Similarly, Horobi and Soreo are both Parent-Type Humagear, with Horobi being created using Soreo's data as basis.
  • The words spoken during Horobi Ark-Scorpion's transformation announcement are English translations of the words spoken in Ark-One's transformation announcement:
    • "Destruction" (破壊 Hakai)
    • "Ruin" (破滅 Hametsu)
    • "Despair" (絶望 Zetsubō)
    • "Extinction" (滅亡 Metsubō)
  • Ark-Scorpion's transformation announcement is a reference to his suit actor, Seiji Takaiwa (高岩 成二), by the jingle "The conclusion after evil climbs the top of the highest () mountain of rock ()".
  • Horobi is the first Final Villain since Joker Undead (and thus Reiwa's first Final Villain) to survive the final battle against the heroes instead of dying. This does not count CronusEvolto, & Another Decade, who all died in their final battles and were resurrected post-series.
    • Similarly, Horobi & Hajime were given a second chance in life, being fully redeemed, and were allowed to blend in with human society.
  • Horobi holds the record of having the largest amount of appearances out of all of the other members, with him being in all of the Zero-One episodes.
  • Horobi is the second Rider in the series to have transformed using four different Drivers, with Aruto being the first. However, while Aruto holds the distinction of having transformed into the most number of Riders on his own (totaling four), Horobi falls short at three as his usage of both the ForceRiser and Zetsumetsu Driver grant him essentially the same Kamen Rider Horobi name, while the Ark-Driver and MetsubouJinrai Driver were utilized involving an external entity (Ark and the other members of MetsubouJinrai).
  • In Kamen Rider Zero-One: REAL×TIME, before finishing Buga, Horobi's finisher stance had the same stance as Agito's finisher stance.



Icon-zero-one.png Kamen Rider Zero-One
Kamen Riders
Soreo Hiden - Aruto Hiden - Isamu Fuwa - Yua Yaiba - Jin - Horobi - Ikazuchi - Naki - Gai Amatsu - Ark - S
Movie-exclusive: Soreo Hiden - S - Behru - Kamen Rider Abaddon - Izu - Lyon Arkland - Kamen Rider MetsubouJinrai (Jin, Horobi, Ikazuchi & Naki)
Stageshow-exclusive: Azu - Little Assassin
Hiden Zero-One Driver - A.I.M.S. Shotriser - MetsubouJinrai Forceriser - Zetsumeriser - ZAIA Thousandriver - Cycloneriser - Raidriser - ZAIA Slashriser - Ark Driver - Hiden Zero-Two Driver - Zetsumetsu Driver - Eden Driver - Abaddoriser - MetsubouJinrai Driver
Progrisekeys - Progrise Holder - Progrisekey Connector - Hiden Risephone - Rider Models
Attache Calibur - Attache Shotgun - Attache Arrow - Breaking Mammoth - Giger - Buaruku Sabers - Authorise Buster - Assault Grip - Thousand Jacker - Progrise Hopper Blade - ZAIA Spec - Knuckle Demolition - Nihon Ookaminotsume - Claw Assault - Horobi's Katana
Hiden Intelligence: Korenosuke Hiden - Soreo Hiden - Jun Fukuzoe - Sanzo Yamashita
Humagears: Izu - Shesta - Soreo Hiden - Wazu Nazotoku - Subaru - Hakase Bot - Fukkinhoukai Jiro
Legend Riders: Sougo Tokiwa - Geiz Myokoin - Woz - Tsukuyomi
Humans: Norio Uozumi - Go Sakurai - Satoshi Sakurai - Choichiro Ishizumi - Seiji Tazawa - Satō - Yuta Yomura - Isao - Shinya Owada - Ikkei Amatsu - Akane Tono
Humagears: Mageana - Ikkan Nigiro - Anna - Mashirochan - Dr. Omigoto - Z #5 - Delmo - Love-chan - Midori
A.I.s: Zea - Zat - Ai-chan - Thouser
Ark - Horobi - Naki - Jin - Ikazuchi - Little Assassin - Azu
Monsters: Berotha Magia - Kuehne Magia - Ekal Magia - Neohi Magia - Onycho Magia - Vicarya Magia - Gaeru Magia - Mammoth Magia - Dodo Magia - Arsino Magia
Footsoldiers: Trilobite Magia - Dodo Magia Chick - Battle Magia
Other Villains:
Finis - Will
Gai Amatsu - Williamson Yotagaki
ZAIA Spec Representatives: Rentaro Tachibana - Tatsumi Arayashiki - Naoto Ichimori - Takeshi Homura - Masamitsu Yuto
Other: Daiki Kyogoku - Makio Nodachi
A.I.M.S.: Isamu Fuwa - Yua Yaiba - Naki - Eida - Ono - Degawa - Shida - Eifuku - Ito
Monsters: Crushing Buffalo Raider - Splashing Whale Raider - Dynamaiting Lion Raider - Storming Penguin Raider - Scouting Panda Raider - Fighting Jackal Raider
Footsoldiers: Invading Horseshoe Crab Raiders
Lyon Arkland - Sold9 - Sold20 - Sold404
Monsters: Dire Wolf Sold Magia - Serval Tiger Sold Magia - Crushing Buffalo Sold Magia - Splashing Whale Sold Magia - Storming Penguin Sold Magia - Scouting Panda Sold Magia - Invading Horseshoe Crab Sold Magia
Footsoldiers: Solds
S - Behru - Buga - Mua - Lugo
Footsoldiers: Kamen Rider Abaddon
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