Ohma Zi-O
Icon-zi-o.png This article is about a/an rider in Kamen Rider Zi-O.

"You fools could never hope to defeat me. Do you know why? Because I was born to be king!"
―Ohma Zi-O's declaration of his ironfist rule in 2068.[src]

"If you're that against becoming a demon king...then let me tell you what you can do. Throw away that belt! If you do that, then you won't become me."
―Ohma Zi-O offering his past self a chance to alter his destiny[src]

"My young self. I knew you could never give up your dream ... for you are me."
―Ohma Zi-O after he is restored to existence[src]

"Meeting you certainly was interesting, my young self."
―Ohma Zi-O's last words before being permanently erased[src]

Ohma Zi-O (オーマジオウ Ōma Jiō), alternatively spelled Oma Zi-O, is the alternate future self of Sougo Tokiwa (常磐ソウゴ Tokiwa Sōgo) who rules the world in the year 2068 as the Demon King (魔王 Ma Ō), eventually devastating the world into ruins and wiping out half the population.


Early Life

Main article: Sougo Tokiwa#Early Life

Rise of the Demon King

In the original timeline, Sougo Tokiwa followed the events of his main counterpart, up until the interference of Geiz, Black Woz and Tsukuyomi from the future. He eventually obtained his Ziku-Driver and the Zi-O Ridewatch to become Kamen Rider Zi-O. Unlike the original Sougo, Ohma Zi-O did not at any point become discouraged, thus it did not create a path for GeizRevive's existence.

Zi-O evolving into Ohma Zi-O during the event of Oma's Day.

Eventually Sougo Tokiwa obtained the Zi-O Ridewatch II and gained additional abilities to manipulate time however he wanted to. On April 7, 2019, Sougo evolved into Kamen Rider Ohma Zi-O from his base form during the events of Oma's Day. Using this newfound power, he destroyed the world using the Dai Mazines, eventually wiping out at least 50% of the Earth's population, and began his rule over the planet.

Zi-O's Arbitrary Rule

At the start of the series, Tsukuyomi and Geiz, along with the Resistance, attempted to wage a war against Sougo, only for him to effortlessly destroy them completely, before declaring that none of them were capable of defeating him because he was "born to be king". Some time after this ordeal, Tsukuyomi and Geiz traveled to the past, with one intent on changing Sougo's fate of becoming Ohma Zi-O and the other wanting to kill him before he can embark on the path. Kingdom 2068

Meeting his younger self

Sougo meeting his younger self.

One day, as he was sitting on his chrysanthemum throne in an isolated field, Sougo sensed his younger self's presence, who had been sent to 2068 by Tsukasa Kadoya, and pondered if his youthful self wanted to speak to him. He materialized the Ryuki Ridewatch and summoned Dragreder to bring both his past self and Tsukuyomi to him. As the past Sougo spotted him, but was unsure of his identity, Sougo proposed that they talk about the dream they both had in their youth about the Dai Mazines destroying the city, stating every exact detail right down to the man in black who approached them. As the past Sougo realized that Ohma Zi-O really was him all along, Sougo stood up as the sudare rose, revealing his face to both his past self and Tsukuyomi. Laughing, Sougo asked his younger self why he was shocked, and was surprised to find his youthful self in denial of actually becoming the demon king. The past Sougo continued to protest, but Sougo assured him it's their dream and destiny to become king and save the world, before telling the past Sougo that this was their future. When the past Sougo claimed he would become the "kindest and greatest demon king", Sougo laughed and revealed he swore the same thing, and believed that, thanks to perfection, he had actually succeeded. This made the past Sougo enraged, and he decided to defeat him right then and there.

Ohma Zi-O offering Zi-O the choice of throwing away his Ziku-Driver.

"How nostalgic. So that's how weak I used to be."
―Ohma Zi-O noting Zi-O's strength.[src]

As he watched the past Sougo shove Tsukuyomi aside in anger and transformed into Kamen Rider Zi-O, Sougo laughed as Zi-O executed a Fourze ZureZure Shooting from his Zikan Girade Gun Mode. The attack destroyed the throne, but Sougo emerged unscathed, having transformed into Ohma Zi-O, which shocked the past Zi-O. Ohma Zi-O described the nostalgia of his original Rider form, noting that he "used to be this weak", before countering with a golden shock wave, sending Zi-O flying through the dirt. Approaching Zi-O, Ohma Zi-O assured him that, at some point in his time, he would receive the power of a demon king, but Zi-O angrily dismissed it, transforming into Kamen Rider Zi-O Decade Armor, and performed a Kuuga Dual Time Break Rider Slash with the RideHeisaber. Pulling out the Kuuga Ridewatch of his own, Ohma Zi-O cancelled Zi-O's attack and countered with Kuuga's Rider Kick, knocking Zi-O down to the ground. Ohma Zi-O told his younger self that his indomitable will and refusal to surrender are qualities of a king, but Zi-O told him to shut up and executed a Kiva Dual Time Break, which was countered by Ohma Zi-O's Bloody Rose summoned via the Kiva Ridewatch, reducing Zi-O to his knees. Refusing to accept defeat, Zi-O attempted to attack his future self again with a Ryuki Dual Time Break Rider Slash, but Ohma Zi-O used his own Ryuki Ridewatch to summon Dragreder and made the dragon attack Zi-O, knocking him back down to the ground once more. Tsukuyomi came to the young Sougo's aid, and Zi-o had become thoroughly overwhelmed by his future self's power. However, Ohma Zi-O offered him a choice: if the past Zi-O did not wish to accept his fate as a malicious demon king, he must destroy his Ziku-Driver. Back to 2068

Sougo, restored back to existence in the timeline.

Zi-O pondered over this choice, not really wanting to give up his power. Ohma Zi-O generated golden energy from his clock hand-style cape and launched it at Zi-O, drawing the rider closer before detonating it and forcing the past Sougo out of his transformation. He then created a small time window to reveal that Kasshine was overpowering Kamen Rider Geiz Faiz Armor, at the same time stating it would not be long before Geiz was killed. Telling the past Sougo to return to 2018, Ohma Zi-O created a time portal and allowed both his past self and Tsukuyomi to pass through it and return to the present. Closing the portal, he expressed his interest in the decision his past self would make. Cancelling his transformation, before sitting back on his repaired throne, Sougo sensed his past self letting Geiz destroy his Ziku-Driver, and laughed as he was erased from the timeline. After the past Sougo, despite knowing the horror of becoming the demon king, became Kamen Rider Zi-O again, Sougo was restored back to existence in the timeline, laughing as he knew his past self couldn't give up his dream. Forever King 2018

Message from the Future

"There are six powers left for you to obtain. Obtaining all the Watches is... your path towards kingship. The path to conquest!"
―Ohma Zi-O presenting his past self the final Ridewatches to become the Demon King.[src]

Ohma Zi-O telling the younger Sougo to collect the remaining six Watches.

After the past Sougo acquired the power of Trinity and the Blade Ridewatch, Daiki Kaito presented Sougo and Geiz with a message from Ohma Zi-O, who congratulated his past self for having collected the Blade Ridewatch, having known about it all along. Ohma Zi-O then manifested six Ridewatches: Agito, Hibiki, Kabuto, Den-O, Kiva, and Drive, and told the past Sougo that he would have to obtain kingship by acquiring the remaining six Rider powers. 2019: Trinity Has Begun!

Duel of the Demon Kings & Time Alteration

"My youthful self."
"Ohma Zi-O."
"So you've obtained the power of all the Riders. Regardless, you're still no match for me."
"Let's see. I've got a feeling this is going to work out.
―Ohma Zi-O challenging GrandZi-O to test his new power.[src]

GrandZi-O prepares to fight Ohma Zi-O.

After his past self obtained the GrandZi-O Ridewatch and defeated Another Den-O, Ohma Zi-O teleported Sougo back to 2068, and forced him in his GrandZi-O form. Standing in front of GrandZi-O, Ohma Zi-O congratulated his past self for having successfully obtained all of the Rider powers, but claimed he's still no match for him. GrandZi-O, believing he can fare against his future self, challenged Ohma Zi-O. He accepted the challenge and told him to come face his future self as he manifested two Rouse Cards and Double's cyclone energy attacks, which GrandZi-O deflected as he ran towards Ohma Zi-O. 2017: Grand Climax! Face to face, Ohma Zi-O traded punches with GrandZi-O before both riders forced one another back and summoned manifestations of Kamen Riders Kuuga and Build. As the manifestations fought, Ohma Zi-O teleported in front of GrandZi-O and resumed their battle, blocking every one of GrandZi-O's attacks with no effort. Despite GrandZi-O's proclamation to end his tyrannic rule after Kuuga and Build's manifestations dissipated, Ohma Zi-O reminded him they were still the very same Sougo Tokiwa and scolded his past self for not acknowledging his destiny. This angered GrandZi-O as he summoned a manifestation of Drive. Ohma Zi-O took control of the manifestation and corrupted it, forcing it to attack GrandZi-O and defeat him with a Full Throttle Rider Kick, cancelling the past Sougo's transformation.

Ohma Zi-O, realizing that someone altered the timeline.

As Woz teleported and rushed to the past Sougo's side, who wondered why he lost, Ohma Zi-O revealed to him he hadn't truly acquired all of the Riders' powers, as the past Sougo's Drive Ridewatch was the one Geiz had stolen from Ohma Zi-O before. As the past Sougo refused to submit, Ohma Zi-O berated his stupidity and fired a shockwave at his past incarnate, forcing Woz to send the past Sougo back to 2019. Now alone, Sougo commended Woz for his action, but the Drive manifestation dissipated and chronal energy surged through 2068. Sougo realized that someone in the past had altered the timeline, placing his current one in jeopardy if the new one cemented in history. Eventually, his past self was able to return the timeline back to normal, and Ohma Zi-O's existence was untouched. 2019: World, Reset

Zi-O's Final Challenge

"Tell me. What is Ohma Zi-O's power?"
"The power to destroy time. Someone like Swartz does not have the power to destroy the world. He plans to have you destroy the dimensions."
"But I won't become you."
"Oh, really? You are me. I look forward to seeing... which timeline you destroy, and how you go on about it.
―Ohma Zi-O explaining his power to the past Sougo.[src]

Zi-OTrinity squaring off against Ohma Zi-O.

After Hiryu Kakogawa's alternate timeline was erased, Ohma Zi-O's existence was reestablished in history. Attacking the Resistance, Sougo forced them into a corner until the past Sougo arrived and transformed into Kamen Rider Zi-O. Relocating to a new field, Ohma Zi-O stated he had no recollection of his past self's returning to 2068 a second time, which Zi-O assured that history has changed, and what was Ohma Zi-O's past was Zi-O's future. Accepting this new event, Ohma Zi-O told Zi-O it's pointless to change their history, but Zi-O disagreed and fired his Zikan Girade gun mode at Ohma Zi-O, which he deflected with his power. He later blocked Zi-O's sword strikes with his arm before seizing his weapon and unleashing an energy wave at Zi-O.

As Zi-O rose, Ohma Zi-O saw him transform into Zi-OTrinity and charge at him with the Saikyo Zikan Girade, blocking every strike from the giant blade and even the King Giri Giri Slash. Zi-OTrinity rushed forward and attacked with the Saikyo Zikan Girade with all his might, which Ohma Zi-O countered with his own strength, causing a fallout explosion under the Demon King's feet. In a standoff, Ohma Zi-O was shocked to see Zi-OTrinity push his arms up and place the sword's tip at his torso, executing a surprise Trinity Time Break Burst Explosion that sent Ohma Zi-O crashing into a mountain. Falling down to the ground, a staggering Ohma Zi-O admitted he never had that kind of power in his own youth. Zi-OTrinity said his power was not just his own but his comrades' as well, something Ohma Zi-O never had. Finding Zi-OTrinity's claim amusing, Ohma Zi-O surmised that his past self would also have to sacrifice himself for his friends as well, forcing the past Sougo to cancel his transformation and send both the shocked Geiz and Woz back to 2019.

Ohma Zi-O then realized the past Sougo did not want his friends to find out about his planned sacrifice, as he also admitted that fighting each other was nothing but meaningless. He also surmised Ohma Zi-O never had any intention of killing him, since they were the same person. Hearing the past Sougo's demand to know what his power is, Ohma Zi-O revealed it was the power to destroy the very fabric of time and space, and that Swartz was using their power to enact that, since the Time Jacker could not do it himself. As his past self still claimed he would not become him, Ohma Zi-O assured him otherwise, and questioned what choices he would make, before sending him back to 2019.

Ohma Zi-O creating the Tsukuyomi Ridewatch.

Against his own judgement, Sougo chose to help his past incarnate, and raised his hand and transferred some of his power into a blank Ridewatch Tsukuyomi had in her pocket, which Sougo's youthful self had previously slipped into hers as he saved her from Ohma Zi-O's attack earlier. This created the Tsukuyomi Ridewatch for her to use in 2019. 2068: Ohma Time

Erasure From the Timeline

Ohma Zi-O's last moments before his permanent erasure.

After his past incarnate defeated Swartz with the power of Ohma Zi-O and planned to erase the current timeline, Sougo asked his youthful self if that was his decision as they conversed one last time. Sougo told him they had the right to be king for having saved the world, but the past Sougo claimed the world was saved by Geiz's and Tsukuyomi's sacrifices and the power of the past Kamen Riders, and there's no point in ruling without his friends with him. Realizing that his past self had chosen a virtuous path instead of a ruler's, Sougo assured him the power of Ohma Zi-O was both destruction and creation, which cemented the past Sougo's resolve to destroy the timeline and create a new one, effectively rewriting history. Before his past self left, Sougo told him he would never have another chance to become king. His youthful self's only response was that he would, albeit through a different way as the future was always in flux and unpredictable. Laughing in amusement, Sougo bid farewell to his past self before being erased permanently from the timeline, claiming that it was interesting to have met his youthful self. 2019: Apocalypse

Other Events

Kamen Rider Zi-O: Over Quartzer

Ohma Zi-O in Kamen Rider Zi-O: Over Quartzer

Ohma Zi-O giving a motivational speech to his younger self

During the Quartzer crisis, when his past self observed fond memories of their parents, he appears to his past self in his era and motivated him to defeat Barlckxs. He later provided his past self with another step towards the ultimate power: the Ohma Zi-O Ridewatch. This eventually allowed young Sougo to defeat SOUGO. Kamen Rider Zi-O: Over Quartzer

Kamen Rider Zi-O: Final Stage

Kamen Rider Zi-O: Final Stage
Ohma Zi-O was briefly restored to existence by the combined powers of a group of five Riders who belong to both the Showa and Heisei Eras. Together with his younger self's Ohma Form, the two managed to make extremely short work of Another Ohma Zi-O.

Kamen Rider Zi-O NEXT TIME: Geiz, Majesty

Ohma Zi-O briefly appeared in Keito Myokoin's dream, where he was challenging Kamen Rider Geiz, who was about to use GeizMajesty Ridewatch against him. Kamen Rider Zi-O NEXT TIME: Geiz, Majesty

Rider Time: Decade VS Zi-O & Rider Time: Zi-O VS Decade

"True Sougo"

"True Sougo" as Ohma Zi-O

Main article: True Sougo

Ohma Zi-O returns as the main antagonist of Rider Time: Kamen Rider Decade VS Zi-O and Rider Time: Kamen Rider Zi-O VS Decade. He is referred as True Sougo (真実のソウゴ Shinjitsu no Sōgo). True Sougo's actual nature and origin is currently debatable. Whether he is the same Ohma Zi-O from the TV show, originates from Sougo A's future, or a version of Ohma Zi-O from an A.R. World remains to be explained.

After being weakened from destroying and creating to many worlds, he sets up a death game to select a suitable host for his body, which drew the attention of Tsukasa Kadoya. When Ohma Zi-O attempted to bring all six different versions of Sougo Tokiwa, each from their own dimensions, which in turned regressed his body into the form of a child with amnesia. Eventually, he remembers his life as Ohma Zi-O; after transforming into the Demon King while revealing his identity, he tries to take the original Sougo's life, but subsequently defeated by Zi-O. Rider Time: Kamen Rider Decade VS Zi-O -Decade Mansion's Death Game- Rider Time: Kamen Rider Zi-O VS Decade -7 of Zi-O!-

Video Game appearances

Kamen Rider Buttobasoul

Ohma Zi-O medal

Kamen Rider Ohma Zi-O is a playable character with other Kamen Riders of Showa and Heisei-Era.

Kamen Rider City Wars

Ohma Zi-O encountering Zi-O OhmaForm and Ichigo

Separated from the younger self, Ohma Zi-O appeared as a Boss enemy in Kamen Rider City Wars.


From what was known about him, Ohma Zi-O was shown to be very arrogant due to his tremendous power, proclaiming that he was chosen to be the ruler of the world from birth. He did not even view the resistance fighters as serious threats. His arrogance was not without merit, however, as his battle against his younger self demonstrated impressive mastery over his abilities of his predecessors. Furthermore, he was extremely confident and fearless, as he openly suggested to his past self to throw away the Ziku-Driver, an action that would result in his own temporal erasure, and even arrogantly laughed as he was disappearing from the timeline, suggesting that everything young Sougo would do were within his calculation and expectation.

However, he still believed that his tyranny had somehow saved the world. When young Sougo claimed that he wished to become the "kindest and greatest" Demon King, this Sougo replied that he did in fact become the "kindest and greatest" Demon King, albeit not in the sense of compassion, but in the sense of perfection.

Although known for being a villainous demon king, Sougo was still shown to have retained some of his past traits. He continued to encourage his younger counterpart to the path to kingship, although it was mostly for saving his own existence. During the Quartzer crisis, he dragged his past self to his era and motivated him to defeat Barlckxs and provided him with another step towards the ultimate power: the Ohma Zi-O Ridewatch. He was also quite amused when he found out that Zi-OTrinity could briefly overpower him. He then explained the true extent of his power and gave some of his power to Tsukuyomi (albeit against his will), resulting in the creation of the Tsukuyomi Ridewatch.

In the series finale, when the past Sougo himself revealed that he was going to use the powers to reset time instead, Sougo did not get upset, but rather became amused and looked forward to seeing a future that the past Sougo would create without the powers of Ohma Zi-O. Even when knowing full well that he would permanently cease to exist, Sougo harbored no ill will towards his youthful self's actions, and he willingly let himself be erased without resistance, this time with a satisfying laugh of amusement and consent.

Powers and Abilities


  • Disintegration: Ohma Zi-O can send out a powerful wave of energy that can disintegrate anything in its path.
  • Enhanced Awareness: Ohma Zi-O immediately sensed and identified the threat of incoming missiles.
  • Velocity Manipulation: Ohma Zi-O can freeze dozens of missiles.
  • Time Manipulation: Ohma Zi-O can freeze time before disintegrating enemies. According to Tsukuyomi, Ohma Zi-O has all of the abilities that come with Sougo Tokiwa's Zi-O Ridewatch II, thus implying that Ohma Zi-O can reverse time as well.
  • Timeline Alteration: Tsukuyomi theorizes that Sougo's dreaming ability causes his encounters with the future Riders to actually happen in reality, an ability that (according to her) Ohma Zi-O also seems to possess.
  • Telekinesis: When an army of Time Mazines attempt to crush Ohma Zi-O, he simply uses telekinesis to hurl them into each other.

Ohma Zi-O's golden time portal.

  • Time Portal Creation: Ohma Zi-O can create time portals, which are even capable of forcefully pulling a person into themselves. Forever King 20182017: Grand Climax!
  • Legend Riders' Powers: Ohma Zi-O has the powers of all the Riders prior to the year 2068.[1] He can tap into their powers by activating their Ridewatches as well as simply through his will. He can also summon Rider clones and even corrupt the ones summoned by others.2019: World, Reset
    • Kuuga: Summons an energy construct of Lynt Hieroglyphics to create an energy kick.
    • Kiva: Summons the Bloody Rose, allowing him to control a colony of energy bats.
    • Ryuki: Summons Dragreder to attack his target.
    • Blade: Summons two large Rouse Cards to attack his target.
    • Double: Summons a green/purple colored energy cyclone.


  • Expert Manipulator: Like his past iteration, the future Sougo is also manipulative, even towards his younger self.


  • Sougo Tokiwa: Because Ohma Zi-O is Sougo's future self, any disturbance in the timeline (for example, the Ziku-Driver's destruction or Sougo's death) can erase Ohma Zi-O from existence. Forever King 2018 In their third and final match, his young counterpart, alongside with his companions, was able to overwhelm Ohma Zi-O to his knees, although the latter had no intention to go all out against his younger self, a fact acknowledged by young Sougo himself. 2068: Ohma Time
  • Hiryu Kakogawa (Formerly): Another Zi-O II's ability to alter history and reality can put Ohma Zi-O's existence in jeopardy.


Kamen Rider Zi-O


"Rider Time! (Electronic beat) Kamen Rider Zi-O!"
―Transformation announcement[src]

Rider Statistics

  • Rider Height: 200.0 cm[2]
  • Rider Weight: 92.0 kg[2]

Ability Parameters

  • Punching Power: 8.2 t[2]
  • Kicking Power: 19.0 t[2]
  • Maximum Jump Height: 30.2 m[2]
  • Maximum Running Speed: 100 m per 5.0 sec.[2]

Sougo transforms into Kamen Rider Zi-O (仮面ライダージオウ Kamen Raidā Jiō) by inserting the Zi-O Ridewatch into the D '9 Slot on the Ziku-Driver. His base form's visor reads "Rider" (ライダー Raidā), while the logo on his forehead reads "Kamen" (カメン) in katakana. Zi-O's personal weapon in his base form is the Zikan Girade.

Zi-O consists of the following parts:

  • Caliber A (キャリバーA Kyaribā A) - Zi-O's helmet. 'A' stands for Analog.
    • Clock Blade A (クロックブレードA Kurokku Burēdo A) - The clock hands on the Caliber A. It is a data collection device. The long hand, Baryon Hand M (Barion Hando M バリオンハンドM) predicts temporal information, such as enemy timing, while the short hand, Meson Hand H (メソンハンドH Meson Hando H) measures spatial information, such as the distance between Zi-O and the enemy as well as landing points of finishers.
    • Ow Signal (オウシグナル Ou Shigunaru) - The circular section where the two Clock Blades meet. It feeds gathered information to Zi-O, derive optimum solution to problems, and adjust internal systems of Zi-O.
    • Indication Eye (インジケーションアイ Injikēshon Ai) - The visor which spells out "Rider". Sensors with a 270° viewing angle is built into the compound eye.
    • Kamen Dial (カメンダイアル Kamen Daiaru, lit. 'Mask Dial') - Zi-O's faceplate. It invokes an analog clock face, and is made using a multilayer structure composed of the special metal alloy Graphenium (グラフェニウム Gurafeniumu). The Kamen Dial is described by the TV Asahi website to have a beautiful white lustre finish.
    • Crash Bezel (クラッシュベゼル Kurasshu Bezeru) - The metal frame surrounding the face. It is composed of Graphenium.
    • Core Ryūzu (コアリューズ Koa Ryūzu, lit. 'Core Crown') - The 'button' on Zi-O's left cheek. It is an information management unit that stores combat data.
  • Oval Light Tecter (オーバルライトテクター Ōbaru Raito Tekutā) - Zi-O's shoulder and chest armor. A metal coating called Graphenium Coat (グラフェニウムコート Gurafeniumu Kōto) has been applied, raising durability. As a result, the Oval Light Tecter is not only lightweight, but is also 200 times stronger than steel.
  • Mid Band Liner M (ミッドバンドライナーM Middo Bando Rainā M) - The silver band that runs vertically across Zi-O's torso, it connects the Ziku Driver to the head, converting energy made by the Driver into bioenergy.
  • Time Rush Arm (タイムラッシュアーム Taimu Rasshu Āmu) - Zi-O's arms. Nanoscopic "Nanotube Muscle" (ナノチューブ筋 Nanochūbu-kin) tubing covers it, increasing strength.
  • Flex Arm Girder (フレックスアームガーダー Furekkusu Āmu Gādā) - Zi-O's forearm armor. It is composed of the shock-absorbant material Amsein (アムセイン Amusein), allowing it to absorb and disperse physical attacks with ease.
  • Zi-O Leap Hand (ジオウリープハンド Jio Rīpu Hando) - Zi-O's hand units. It is covered with the purple metal Graphenium Bite (グラフェニウムバイト Gurafeniumu Baito) units, raising destructive power of punches.
  • Adjustrike Suit (アジャストライクスーツ Ajasutoraiku Sūtsu) - Zi-O's bodysuit. It automatically repairs minor damage.
  • Time Rush Leg (タイムラッシュレッグ Taimu Rasshu Reggu) - Zi-O's legs. Nanoscopic "Nanotube Muscle" (ナノチューブ筋 Nanochūbu-kin) tubing covers it, increasing strength.
  • Counter Pad (カウンターパド Kauntā Pado) - Zi-O's kneepads. It reads combat data on the field and sends it to the helmet.
  • Flex Leg Girder (フレックスレッグガーダー Furekkusu Reggu Gādā) - Zi-O's shin protecters. It is composed of the shock-absorbant material Amsein, allowing it to absorb and disperse physical attacks with ease.
  • Zi-O Leap Shoes (ジオウリープシューズ Jio Rīpu Shūzu) - Zi-O's shoes. The tip is covered with the Graphenium Bite (グラフェニウムバイト Gurafeniumu Baito) units, increasing destructive power of kicks. Additionally, The katakana for the word "Kick" (キック) in engraved on the soles.

This Form is Exclusive to Zi-O Episode 17

Kamen Rider Ohma Zi-O

Ohma Zi-O

"Shukufuku no toki! Saikō! Saizen! Saidai! Saikyō ō! Ohma Zi-O!"
―Transformation announcement[src]

Rider Statistics

  • Rider Height: 200.0 cm[3]
  • Rider Weight: 144.0 kg[3]

Ability Parameters

  • Punching Power: 108.3 t[3]
  • Kicking Power: 324.9 t[3]
  • Maximum Jump Height: 240.6 m[3]
  • Maximum Running Speed: 100 m per 0.1 sec.[3]

Kamen Rider Ohma Zi-O (仮面ライダーオーマジオウ Kamen Raidā Ōma Jiō), or simply Ohma Zi-O, is the final form of Sougo in a dystopian future. His visor reads "Rider" (ライダー Raidā), while the logo on his forehead reads "Kamen" (カメン) in katakana. In the initial position of the timeline, Sougo obtained this form on the event of Oma's Day, gaining control over the Dai Mazines and obtaining power of all Kamen Riders known to exist till date.

Compared to all of the other forms of Zi-O, Ohma Zi-O's skills are far beyond anything seen so far in the series. In addition to that, though Zi-O (2018-19), Geiz, and Woz need to use Ridewatches in their Drivers and/or weapons for using Legend/Future Rider powers, Ohma Zi-O can simply use them either through his will or by activating the respective Ridewatches.

Ohma Zi-O is composed of the following parts:

  • Complication Caliber A (コンプリケーションキャリバーA Konpurikēshon Kyaribā A) - The helmet
    • Transcendence Blade (トランセンデンスブレード Toransendensu Burēdo) - The two clock hand antennae. The long Transcendence Baryon Hand (トランセンデンスバリオンハンド Toransendensu Barion Hando) collects temporal information, such as the timing of enemy attacks while the short Transcendence Meson Hand (トランセンデンスメソンハンド Toransendensu Meson Hando) collects spatial information such as the distance between enemies and trajectory angles.
    • Ohma Signal (オーマシグナル Ōma Shigunaru) - The meeting point of the two Transcendence Blades. Adjusts Ohma Zi-O's systems according to information collected by the Transcendence Blades.
    • Parallel Rattrapante (パラレルラトラパンテ Parareru Ratorapante) - The three clock-like devices on Ohma Zi-O's forehead. Allows Ohma Zi-O to sense parallel timelines and informs him of any temporal changes made to history. Also allows Ohma Zi-O to sense parallel worlds. (Note, a rattrapante is a type of chronographic device that possesses two second hands, allowing the user to time multiple events. Also known as a 'double chronograph'.)
    • Expressive Flame Eye (エクスプレッシブフレイムアイ Ekusupuresshibu Fureimu Ai) - The red visor that spells out 'Rider' in katakana. Sensors with a 270° viewing angle is built into the compound eye. Additionally, its red coloring is due to it being in a constant state of heat, being 1000-1200°C. It can shoot out rays of heat at a maximum output.
    • Decorative Dial (デコラティブダイアル Dekoratibu Daiaru) - Ohma Zi-O's faceplate. It is a multilayered armor structure. The top layer utilizes Dark Matter Ingot (ダークマターインゴット Dāku Matā Ingotto) as a decorative material.
    • Divine Bezel (ディバインベゼル Dibain Bezeru) - The golden frame that surrounds Ohma Zi-O's face. It is composed of Zavaldust Graphenium (ザバルダストグラフェニウム Zabaru Dasuto Gurafeniumu), which is 1200 times stronger than steel. Super dense diamonds are encrusted into it.
    • Core Diadem (コアダイアデム Koa Daiademu) - The 'button' on Ohma Zi-O's left cheek. It is an information storage unit that has information on every single Kamen Rider from the Heisei era. It also stores information recorded by the Ohma Signal.
  • Ohma Radiant Armor (オーマラディアントアーマー Ōma Radianto Āmā) - Ohma Zi-O's upper torso magic armor. It is engraved with multiple decorations that channel magical energy through it (similar to Kamen Rider Wizard). It dons a special energy field titled Absolute Throne (アブソリュートスロウン Abusoryūto Suroun), negating any damage dealt to Ohma Zi-O.
    • Ornament Slots (オーナメントスロット Ōnamento Surotto) - Special slots for Ridewatches located on the Ohma Radiant Armor. A maximum of six Ridewatches can be plugged in. Devices known as Alternate Plugs (オルタネートプラグ Orutanēto Puragu) are installed, allowing Ohma Zi-O to activate a Ridewatch's powers just by activating them.
    • Apocalypse of Kingdom (アポカリプス・オブ・キングダム Apokaripusu Obu Kingudamu) - The two giant clock hands that hang on Ohma Zi-O's back. The hands themselves are titled Aparajita (アパラージタ Aparājita). By rotating themselves on the back, the Apocalypse of Kingdom can create a sort of circular disk attack.
  • Engraved Tecter (エングレイブドテクター Engureibudo Tekutā) - Ohma Zi-O's shoulder armor. It is composed of Zalvadust Graphenium. Contains an inbuilt Sona Count Pad (ザバルダストグラフェニウム Sona Kaunto Paddo).
  • Mid Band Liner Anthem (ミッドバンドライナー・アンセム Middo Bando Rainā Ansemu) - The silver watch strap that travels along Ohma Zi-O's entire body. It is a biological enhancement device, delivering the Ohma Zi-O Driver's inexhaustible energy into the wearer's body, giving them astonishing strength and power.
  • Noble Adjustrike Suit (ノーブルアジャストライクスーツ Nōburu Ajasutoraiku Sūtsu) - Ohma Zi-O's bodysuit. Partial shape changes, such as contraction and expansion, are regularly performed to deal maximum sharpness into an attack. Additionally, due to there being no damage accumulation, thanks to the Ohma Radiant Armor as well as having the highest quality possible self-healing function, it is possible for Ohma Zi-O to continue in battles that may exceed the limits of the wearer.
  • Meridian Sash (メリディアンサッシュ Meridian Sasshu) - The golden watch strap. It is an 'authoritative medal'. It allows Ohma Zi-O to send a 'seperate surge' (セパレートサージ separēto sāji) boundary wave that sends all objects in comes into contact within a 4km radius into a separate dimension.
  • Time Catastrophe Arm (タイムカタストロフアーム Taimu Katasutorofu Āmu) - The arms. The built-in Nanotube Muscle (ナノチューブ筋 Nanochūbu-kin) that covers the entire arm is strengthened and pushed to the absolute limits that humans can tolerate. The addtional ultra-high Gold Compression Line (ゴールドコンプレッションライン Gōrudo Konpuresshon Rain) restraints on the upper arm restrains the Nanotube Muscles' power, yet allows Ohma Zi-O to retain his supernatural power.
  • Solemn Arm Armor (ソレムアームアーマー Soremu Āmu Āmā) - The forearm armor. Crafted out of Dark Matter Ingot, it can freely change its weight and density, increasing punching and blowing impacts. By increasing density as per needed, the ultimate defensive strength can be obtained.
    • Sona Ridewatch Holders (ソナライドウォッチホルダー Sona Raidou~otchi Horudā) - Golden Ridewatch Holders. Due to Ohma Zi-O's ability to pull out Ridewatches out of thin air, they appear to be mere decorative pieces.
  • Ohma Causality Hand (オーマコーザリティーハンド Ōma Kōzaritī Hando) - The hands. It (somehow) manipulates causality and allows Ohma Zi-O to manipulate surrounding objects around him as he wills.
  • Time Catastrophe Leg (タイムカタストロフレッグ Taimu Katasutorofu Reggu) - The legs. The built-in Nanotube Muscle (ナノチューブ筋 Nanochūbu-kin) that covers the entire leg is strengthened and pushed to the absolute limits that humans can tolerate. The additional ultra-high Gold Compression Line (ゴールドコンプレッションライン Gōrudo Konpuresshon Rain) restraints limit the Nanotube Muscles' power, yet allows Ohma Zi-O to retain his supernatural power.
  • Sona Count Pad (ソナカウントパッド Sona Kaunto Paddo) - Collection devices located around the entire body (such as the knees). Instantaneously measures received impacts and information on objects and sends the data to the helmet.
  • Solemn Leg Armor (ソレムレッグアーマー Soremu Reggu Āmā) - The lower leg armor. Crafted out of Dark Matter Ingot, it can freely change its weight and density, increasing kicking impacts. By increasing density as per needed, the ultimate defensive strength can be obtained.
  • Ohma Causality Shoes (オーマコーザリティーシューズ Ōma Kōzaritī Shūzu) - The feet. Allows Ohma Zi-O to (somehow) manipulate causality to float in the air or walk/run at high speeds.

Appearances: Zi-O Episodes 1, 15-16, 29-30, 40-41, Kamen Rider Zi-O: Over Quartzer, 48, Zi-O NEXT TIME: Geiz, Majesty (Dream)


  • Ohma Zi-O Driver - Transformation device. Ohma Zi-O possesses a gold-colored upgraded variant of the Ziku-Driver.
  • Ridewatch Holders - Wristbands used to carry Ridewatches. They are not used by Ohma Zi-O as he can use Ridewatch powers directly.
  • Ridewatches - Transformation trinkets that allow Ohma Zi-O to use powers of different Kamen Riders. Ohma Zi-O has in his possession the Ridewatches of all Riders in existence.

Behind The Scenes


As Sougo is an old man at this point in time, he is portrayed by Seiji Takaiwa (高岩 成二 Takaiwa Seiji), [4], with Rikiya Koyama (小山 力也 Koyama Rikiya) acting as voice-over. His suit actor as Ohma Zi-O is Yasuhiko Imai (今井 靖彦 Imai Yasuhiko).


The "Ohma" in his name refers to Ōmagatoki (逢魔時 lit. "The hour of meeting evil spirits") in Japanese mythology and also a reversed spelling of Demon King (魔王(マオー) Ma Ō).


A close-up of Ohma Zi-O's mask.

  • In addition to his eyes being shaped like the word "Rider" (ライダー Raidā) in katakana, a trait shared with the present Zi-O, Ohma Zi-O's mask is also filled with a pattern comprising the kanji for "King" ( Ō), further symbolizing his nature as the Demon King.
  • As Ohma Zi-O is considered a darker, regal version of Zi-O, it is appropriate that the armor further emphasizes the watch-based elements, with said devices being used as accents on the helmet, trophies on the chest, with a gold watch strap as a bandolier and a large set of hour and minute hands on the back arranged like a cape.
  • Oddly, Sougo's future self's Driver seems to lack slots to insert a Ridewatch. Given that he is capable of using past Riders' powers by simply activating their Ridewatches or by his will alone, Ohma Zi-O no longer needs to insert a Ridewatch into the Driver to transform.
    • It was shown that he can absorb Ridewatches, meaning his supremacy over their powers negates needing the Driver to use them.
    • Being able to instantaneously transform into his Kamen Rider form without needing his Driver is similar to Kouta Kazuraba being able to transform directly into Kamen Rider Gaim Kiwami Arms without summoning his Sengoku Driver if he so chooses.


See Also


Sougo Tokiwa (Over Quartzer) - Geiz Myokoin - Woz (black, white, red) - Tsukuyomi
Other Sougo Tokiwa variations
Ohma Zi-O - Mirror World - Leader of Quartzer - B - C - D - E - F - Robot Sougo - True Sougo
Future Kamen Riders
2022 (Rentaro Kagura - Isamichi Konjo) - 2040 (Mondo Douan) - 2121 (Rento Makina) - Kamen Rider Ginga
Rider Time Ryuki Riders
Ishihashi - Tozuka - Kimura - Ishida - Abyss - Odin
Another World Riders
G4 - Fuma - Dark Ghost - Rey - Katsumi Daido - White Woz - Yuuki
Other Riders
G3 Team - Shun Kageyama (Worm)
Movie-exclusive Riders
SOUGO Tokiwa - Kagen - Jogen - Soreo Hiden
Stageshow-exclusive Riders
Hiryu Kakogawa - Red Woz
Transformation Devices
Ziku-Driver - Ohma Zi-O Driver - Beyondriver - Miraidriver (Shinobi, Hattari, Quiz, Kikai, Ginga) - NeoDecadriver - NeoDiendriver - K-Touch 21
Ridewatches - Miridewatches- Ridewatch Holder - Ridewatch Daizer - Faizphone X - Taka Watchroid - Kodama Suika Arms
Zikan Girade - Zikan Zax - Ride HeiSaber - Zikan Despear - Saikyo Girade - Zikan Jaclaw - Barlckxs' Sword
Ride Striker - Time Mazine - Dai Mazine - Karakuri Robos (Kurogane Oogama - Unnamed Wasp-based Karakuri Robo)
Rider Armors - Oma Advent Calendar - Future Note - Time Finishers
9 5 DO: Geiz Myokoin - Tsukuyomi - Junichiro Tokiwa
Futaros - Ataru Hisanaga - Shingo Hisanaga - Iroha Kagura - Master Gamano - Sara - Ms. Sailor - Oda Nobunaga - Clara Steinbelt - Gyuzo - Pietro - Resistance Captain
Kuuga: Yusuke Godai
Agito: Shoichi Tsugami - Takahiro Omuro
Ryuki: Shinji Kido - Dark Shinji - Ren Akiyama - Takeshi Asakura - Miyuki Tezuka - Jun Shibaura - Goro Yura
555: Takumi Inui - Masato Kusaka
Blade: Kazuma Kenzaki - Hajime Aikawa
Hibiki: Hitoshi Hidaka - Tomizo Todayama - Kyosuke Kiriya
Kabuto: Soji Tendo - Arata Kagami - So Yaguruma
THE FIRST/THE NEXT: Takeshi Hongo - Katsuhiko Yano - Shiro Kazami
Den-O: Ryotaro Nogami - Yuto Sakurai
Kiva: Wataru Kurenai - Jiro
Decade: Tsukasa Kadoya - Daiki Kaito - Yusuke Onodera - Natsumi Hikari
G: Goro
W: Philip & Shotaro Hidari - Ryu Terui
OOO: Eiji Hino - Michal Minato - Akira Date - Shintaro Goto
Fourze: Gentaro Kisaragi
Wizard: Haruto Soma - Kosuke Nitoh
Gaim: Kouta Kazuraba - Kaito Kumon - Takatora Kureshima
Drive: Shinnosuke Tomari - Go Shijima - Chase - Brain
Ghost: Takeru Tenkuji - Makoto Fukami
Kuuga (manga): Yusuke Godai
Amazons: Haruka Mizusawa - Jin Takayama
Ex-Aid: Emu Hojo - Hiiro Kagami - Kiriya Kujo - Kuroto Dan - Masamune Dan
Kamen Sentai Gorider: Aka-Rider - Ao-Rider - Ki-Rider - Momo-Rider - Mido-Rider
Build: Sento Kiryu - Ryuga Banjo - Kazumi Sawatari - Gentoku Himuro - Evolto
Zero-One: Aruto Hiden - Isamu Fuwa - Yua Yaiba - Jin - Horobi
Chuta Ohsugi - Daita Kondou - Chikao Nezu - Hina Izumi - Shibuya Hachioji - Narita Kisarazu - Misora Isurugi - Master of Fumen - Owner - Momotaros - Urataros - Kintaros - Ryutaros - Eri Ogawa - Daisuke Okubo - Amane Kurihara - Mana Kazaya - Riki - Ramon - Deneb - Krim Steinbelt - Takeshi Kinashi - Izu - Shesta - Jun Fukuzoe - Sanzo Yamashita - Narutaki
Swartz - Heure - Ora
Movie Exclusive
Tid - Finis
SOUGO Tokiwa - Kagen - Jogen - Woz
Another Build - Another Ex-Aid - Another Fourze - Another Faiz - Another Wizard - Another OOO - Another Gaim - Another Ghost - Another Double - Another Den-O - Another Kuuga - Another Shinobi - Another Quiz - Another Ryuga - Another Kikai - Another Zi-O (II) - Another Ryuki - Another Blade - Another Agito (troops) - Another Hibiki - Another Kiva - Another Kabuto - Another Drive - Another Decade
Movie-exclusive Another Riders
Another Zero-One - Another 1 - Another Diend
Stageshow-exclusive Another Riders
Another Rider - No Rider - Another Ohma Zi-O
Other Villains
Kasshine - Humanoise - Worms - Elementary Inves - Trilobite Magia - Battle Magia
Niji no Hebi: Yaminin - Dustards
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