Kamen Rider Wiki
Advertisement
Kamen Rider Wiki
Main
Icon-build.png This article is about a rider in Kamen Rider Build.

"Now, shall we begin the experiment? (さ、実験を始めましょうか, Sa, jikken o hajimemashou ka)"
―Sento's catchphrase before transforming[src]

"Build Up!"
―Build's call whenever he changes forms[src]

"The laws of victory have been set! (勝利の法則がきまた!, Shōri no hōsoku ga kimata!)"
―Build's catchphrase when he has an advantage or before he performs a finisher[src]

"This is the best! / worst."
―Sento's catchphrase whenever things go right / wrong[src]

"I'm amazing! I'm the best! I'm a genius!"
―Sento praising his own work[src]

"To protect something important...I will rise up as many times as necessary! That's the Build that we created!"
―Sento's unwavering resolve to protect the innocent.[src]

"Humans aren't that simple! Even if we make mistakes...we do research to make sure that the same thing doesn't happen again. That's the duty of science! I believe in humanity!"
―Sento's stand to protect the Earth from Evolto.[src]

"Now, shall we begin the final experiment?"
― Sento's catchphrase before transforming into Cross-ZBuild[src]

Sento Kiryu (桐生 戦兎, Kiryū Sento) is the main protagonist and narrator of Kamen Rider Build. He is a 26-year-old genius theoretical physicist who experiments with Fullbottles to further enhance his abilities as Kamen Rider Build (仮面ライダービルド, Kamen Raidā Birudo) to fight against the evil organisms called Smash. A man with no memory of his past, he was initially believed to be the popular musician Taro Satou, but was actually the scientist Takumi Katsuragi. As the war for the Pandora Box broke out between the three countries, Sento allied himself with his former enemies and fought against a common enemy who threatened to destroy Earth.

History

Early Life

Main article: Takumi Katsuragi

Takumi Katsuragi performing his "inhumane" experiments as a scientist of Faust

Takumi Katsuragi was a researcher at the Touto Institute of Advanced Matter Physics, and was infamously nicknamed the "Devil's Scientist". Alongside his father Shinobu Katsuragi, they are regarded as the original creators of Project Build, which was completed during Takumi's time with Faust after his firing from the Touto Institute. Takumi's accomplishments had earned him a brief partnership with Kaisei Mogami, in which he traveled to a parallel universe and stole Ex-Aid's power. This particular memory would later resonate with Sento as a dream.

Takumi had eventually reiterated that Project Build was for the sole purpose of fighting against the alien Evolto. Eventually he discovered Evolto's true identity and subsequently confronted his human persona, but was knocked out and has his face and outfit switched with Taro Satou, a man who arrived in response to Takumi's fake job offer. Realizing that Takumi would be useful in gathering the rest of the Fullbottles, Soichi smuggled Katsuragi out of Faust and made it appear as if "Sento Kiryu" was just an amnesiac man found in an alleyway nearby Nascita during a rain day.

Soichi gives Sento the Build Driver

At some point after being taken in by Soichi, he was provided the Build Driver and a set of Fullbottles. During Sento's first fight against a Smash, he fought hand-to-hand but was beaten to the point where he had no choice but to use the belt. Upon transforming, Build defeated the Smash and headed back to Nascita, where Soichi and Misora Isurugi were waiting for him. From that day on, Sento would continue being Kamen Rider Build in order to uncover the mysteries surrounding his past.

The Faust Conspiracy

Sento believing in Ryuga's innocence, helped him escape.

After gaining one year of notoriety as Build, Sento continued searching for his missing memories and landed a mid-level position at the Touto Institute, later finding his first lead an escaped convict Ryuga Banjo. The two meet up and confide in each other, with Ryuga explaining that he was framed for Takumi Katsuragi's murder. As Sento begins connecting Takumi's murder with Ryuga's escape, he is approached by journalist Sawa Takigawa who wishes to interview Sento on his identity as Build. The next day, Sento and Ryuga respond to a Smash alert and encounter Night Rogue, one of the ringleaders of Faust. Upon learning that Ryuga's fiancée Kasumi Ogura had been turned into the Burn Smash, Build was forced to put her down with Ryuga's consent. He extracted her essence into the Dragon Fullbottle to which he gives it to Ryuga as a keepsake.

With Sawa's investigative journalist skills, Sento and Ryuga smuggle themselves to Seito to meet Masahiro Nabeshima, a man with a connection to Takumi Katsuragi's murder and Ryuga's jailbreak. However, Nabeshima is kidnapped by Faust and has his memories erased, dissolving one lead towards Takumi's death. Sawa later finds Taro Satou, a man seemingly identical to Sento, but he's been missing since Takumi's death. Combing through Takumi's notes, Sento and Ryuga meet Takumi's mother Kyoka Katsuragi in Hokuto to retrieve the plans to Project Build. Ultimately, this leads to Sento believing that Takumi was still alive and that he may be Blood Stalk. With Faust getting stronger, Sento arranges to have Ryuga become Kamen Rider Cross-Z using Project Build's plans. Upon learning that Sawa was originally a spy from Namba Heabvy Industries, Sento began feeling the turmoil between the three regions' plans to reclaim the Pandora Box, especially after the "death" Nariaki Utsumi, who was a Faust member the whole time.

Sento upon discovering that he was previously Takumi Katsuragi.

"This is the worst. Having you criticize me... I remember now. I...am a narcissistic-ego driven... hero of justice!"
― Sento regaining his confidence as a Kamen Rider.[src]

One night, Sento receives a phone call from Nabeshima who regained his memories and disclosed Stalk's true identity as Soichi. Suspicious with this revelation, Sento tests Soichi and catches him attempting to escape with the Fullbotles, with the latter confessing to causing the Sky Wall Disaster. Keeping this a secret from Misora to not worry her, Sento and Soichi confront each other in battle, as both Build and Blood Stalk. Using his new RabbitTank Sparking powers, he defeats Blood Stalk and learns from Soichi that Night Rogue's true identity was Gentoku. Learning at the newly appointed Touto Prime Minister had just issued a warrant for both his and Ryuga's arrest, Sento completed the Sclash Driver, but it was stolen by Soichi who brought a copy of the plans to Seito. During a battle with Night Rogue for the Pandora Box, Gentoku is defeated and arrested, but not before revealing to Sento that the amnesiac scientist is actually Takumi Katsuragi the entire time. After hearing how the switch happened, Sento became overridden with guilt due to Takumi's past actions, but ultimately managed to find the confidence to accept it and resolved to right Takumi's wrongs by protecting his country as the hero, Kamen Rider Build.

The Japanese Civil War

With Faust's dissolution in Touto, the starving nation of Hokuto declared war on Touto by sending an army of forces to secure the Pandora Box. Sento and Ryuga voluntarily joined up with the Touto's govenment to protect the nation, but are forced to comply with Gentoku Hiromu's orders. Build and Cross-Z would confront Kamen Rider Grease, Kazumi Sawatari, and the Hokuto Sanbagarasu who are Hokuto's forces intent to take the Fullbottles. Furthermore, Ryuga would take the Slash Driver that Sento created to become Kamen Rider Cross-Z Charge, causing his raging emotions to spiral out of control. Stalk, having set up a Faust base in Hokuto, reveals the concept of Hazard Levels to Sento, revealing that his low level was the cause of his inability to hold Hokuto back.

Sento deciding to use the Hazard Trigger for the first time

"I will stop you. Even if I lose myself!"
―Sento's before transforming to RabbitTank Hazard Form for the first time[src]

Sento, losing his will to fight

Stalk would later gift him the Hazard Trigger, a forbidden item created by Katsuragi that would cause the user to lose sight of himself and rampage. Ignoring this to help Ryuga, it sent Hazard Build into a mindless rage that fatally wounded Aoba. When Sento later regains his senses and realizes what he has done, he is traumatized and loses his motivation to fight. The next day, Sento is notified of an upcoming Proxy Battle between him and Kazumi Sawatari, and regains his composure after receiving all the Fullbottles in possession both Hokuto and Seito from Stalk. In the case he loses control, he trusts Misora will a kill-switch for the Hazard Trigger, which she is reluctant to use regardless. On the day of the duel, Build is overpowered and forced to use the Hazard Trigger to defeat Grease before going berserk. He is stopped by Ryuga, and the referees declare Touto the winner, putting an end to Touto and Hokuto's war.

Despite this victory, Kazumi is called back to Hokuto as Seito has declared war on them, with the Washio brothers holding Kazumi's family hostage. Although Sento and Ryuga offered to help, they are unable to as long as the Washio Brothers were in Hokuto. However when they cross Touto borders, it becomes a whole different story. Mid-battle, they are joined by the previously exiled Gentoku, who joined Seito as Kamen Rider Rogue and defeated Build, Cross-Z, and Grease without breaking a sweat. Recovering from this battle and with Hokuto's current situation, Sento offers them refuge at nascita. When Prime Minister Himuro requested the team for help to protect the Pandora Box, they encounter the Washio Brothers and Rogue in combat. Just as Rogue is about to deal the finishing blow, Misora suddenly appears and reveals the entity inside of her, Vernage, who uses her powers to force Rogue and the Washio brothers over the Sky Wall back to their own territory.

Sento later reports to Soichi about his recent revelations, and Soichi tells Sento about Juzaburo Namba and his Namba Children, revealing that there was a spy in Touto. After Misora regained consciousness, Vernage takes over and tells the team about her past and the old Martian Civilization that was destroyed by Evolto, with Sento later finding actual footage of said events. To end this war, he promised to protect Misora no matter the cost. Working with the Touto government, Sento's team provided three different locations of the Pandora Box to three different members within the government, in which one person came to their location with Seito, with Sento and Ryuga waiting to ambush them. However, Rogue somehow discovered the Box's actual location and kills Akaba, indicating there was still one last traitor amongst the team. The Riders arrive and Build goes berserk with Hazard, but Misora arrives and her bangle is successful in freeing him from his rampage.

Gaining an idea for his new upgrade, the FullFull RabbitTank bottle, he planned on unveiling it at the recently announced Proxy Battle between Touto and Seito. During development, Sawa revealed to Sento that she herself was a Namba Child, the last mole. Sento forgives her and they formulate a plan to ensure Touto's victory at the proxy battle. Arriving at the venue, Build is paired with Rogue for match point and is questioned by Rogue for his motives of using his own weapons. Taking responsibility for his actions, he transforms into RabbitRabbit, a new set of armor that goes over Hazard Form and suppresses the violent stimuli while giving additional power. Although it was able to keep up with Rogue, Seito had received data for that form from Sawa, which allowed Rogue to counter all of RabbitRabbit's moves. However unaware that Sawa was still colliding with Sento from the start, Sento receives the signal to transform into TankTank and defeat Rogue, reaffirming his goals to fight for "love and peace". With Sento's victory, the war with Seito had seemingly come to a close...

The Evolto Revolution

Although Touto had won, Seito dishonorably attacks them anyway with Blood Stalk raising Pandora's Tower using the Sky Wall. Joining with Hokuto against Seito's forces, Vernage explains that Soichi was possessed by an alien known as Evolto who had destroyed Mars, and has his sights set on Earth next. Noticing a mysterious circumstance with Ryuga's past, Sento requests Sawa to look into his background, while creating the Magma Knuckle for him from a damaged Dragon Sclashjelly. As Sento, Ryuga, and Kazumi engage Seito, Gentoku reveals that he is forced to obey Seito due to a neural chip in his brain and urges him to prevent Namba from using the box to take over the world. The next day, Sento intentionally detaches himself from Touto to attack Stalk, and is joined by Ryuga and Kazumi on the way. Ryuga transforms into Cross-Z Magma to help the team gain the upper hand and defeat the Smash clones, before bringing the Pandora Box back to Prime Minister Himuro. Sawa returns from her investigation and shares Ryuga's extraterrestrial origins with the team. The results devastate Ryuga, and Sento is able to learn of Shinobu Katsuragi's involvement in it.

After Rogue abducts Prime Minister Himuro, Evolto demands Sento for the Evol-Driver in exchange for his life. Finding it in his lab, the team head to the trade which goes south as Evolto does not cooperate. Thanks to Sento disabling Gentoku's chip, he now works for the team and helps hold Evolto back. However, Evolto is able to recover his Evol-Driver and emerges as Kamen Rider Evol, killing Taizen Himuro, who dies in Gentoku's arms. The four Riders retaliate, but Sento is defeated and poisoned by Evol, who will die within three days should he not receive the antidote. When Ryuga confronts Evolto for the cure and reiterates his desire to use his powers for good, Sento is forced to witness Evolto possess Ryuga and access a new Dragon-based form to complete Pandora's Tower. Vernage appears and teleports the team and the Box back to nascita, where Sento engineers one of the box's panels for the development of his final power-up, despite the life-threatening risks. In battle, Build attempts to sacrifice himself to destroy Evolto, but it backfires and Evolto manages to take over Sento's body, ejecting Ryuga.

With Sento now in Evolto's possession, Evolto accesses his Rabbit-based Phase 3 form, but is still unable to activate his Evol-Trigger, believing that human bodies are not strong enough to handle such power. Ryuga attempts to transform, but his detachment from Evolto removed his alien essence as well his ability to transform, though his determination allowed him to reignite his genes and become Great Cross-Z. However, Evolto managed to complete the Evol-Trigger and access his Black Hole form, jettisoning Sento. However, what came out was not Sento... but Takumi Katsuragi.

Sento Kiryu's triumphant return and holding the Genius Fullbottle.

Takumi continued to assist the Riders in their efforts against Evolto. Although he behaved just like Sento, Takumi did not possess the fundamentals of a hero, which prevented him from using the Genius Fullbottle that he finished from Sento's handiwork. Hearing of Sento's seemingly heroic deeds from Ryuga, Takumi experienced a flow of memories coming into his mind Sento appears in front of Katsuragi, who asks him if he believed in the power of trust and friendship. Sento responds with a smile, with Katsuragi asks Sento to show him the future he can build. Takumi and Sento join hands, assimilating with each other. During the battle against Kamen Rider MadRogue, Sento revealed himself to Ryuga having regained his memories. Declaring the return of the egotistic superhero, he reveals the Genius Bottle and successfully activates it into his Build Driver, thus giving birth to Kamen Rider Build Genius Form and overwhelm MadRogue with intense speed and power.

The Tomorrow Build Will Create

With Sento returning back to normal, he began to wonder why Evolto was still collecting Fullbotles despite having already reached Black Hole form. Takumi, who occasionally speaks to Sento in their psyche, confirms that Evolto is searching for Faust's Lost Bottles, which was created by their father Shinobu. They discover their location in the Katsuragi residence in Hokuto, but are ambushed by Yoshiko Tajimi who turned into the Owl Lost Smash. After returning her to normal, Evolto began to demand Sento for the Lost Bottles, with Sento later discovering that his father was still alive, having faked his death. Though Sento believed that Shinobu created Project Build with the intent of combating against Evolto, it did not seem that way as Shinobu was working alongside Evolto to complete the Black Pandora Panels using the Lost Bottles.

The team later receive a request to fight against Evolto once again, with Takumi advising Sento to assume that Shinobu had betrayed them. However mid-battle, they are joined by a second Kamen Rider Build, who then reveals himself to be Shinobu Katsuragi. He reveals his intent to collect the Lost Bottles and fights the heroes, turning Misora into the CD Smash. Ultimately by working together, Sento and Ryuga defeat Shinobu, with Vernage giving some of her powers to Ryuga which also stops his episodes entirely. They confront Evolto once again with the final Lost Bottle and turn the tides, defeating him, though Sento isn't convinced they've won yet. Shinobu suddenly arrives and places all of Evolto's essence and gear into a large and reveals his true intentions to foil Evolto's plans. Although Sento hesitates to forgive his father, Evolto escapes and kills Shinobu before the man confides in his son information about a secret White Pandora panel.

Build with the other Kamen Riders as they storm Pandora Tower.

While Sento is distressed over his father's death, Evolto evolves into a horrifying new monster form and begins warping Earth before announcing his intention to destroy it. Sento uses the Hazard Trigger with the Genius Bottle to purify a few Lost Bottles and restore Evolto back to Black Hole. Using his father's research, Sento figures out a way to merge their world with one where the Sky Wall did not exist, using Evolto himself as the catalyst. On Kazumi's request, Sento creates the Blizzard Knuckle for him, warning Kazumi that using it to transform would be fatal. Shortly after Evolto's national television broadcast, the team begin their raid on Pandora's Tower. Kazumi and Gentoku stay behind to fight Evolto's replicants, while Sento, Ryuga, Misora, and Sawa wait for Evolto at the top, later learning of Kazumi's death from becoming Grease Blizzard. Unable to grieve, Evolto arrives and Sento lashes out at the tyrant.

"To be surrounded by a bunch of idiots... this is the best!"
―Sento expresses his relief of being surrounded by idiots before transforming into Kamen Rider Build Genius Form.[src]

The three remaining Riders transform and charge at Evolto, who was unimpressed at their performance and takes an opportunity to transform back into his monster form. Sento and Ryuga watch as Gentoku sacrifice's immobilizes Evolto, allowing Sento to trap Evolto and tether the worlds. However at the last second, Evolto grabs Ryuga and drags him into the ripple between the two Earths. Sento gives pursuit and faces off against Evolto one last time, who mocks his efforts for being a fake hero. Sento retorts that he's been fighting with love and peace, and ultimately accesses RabbitDragon form to vanquish Evolto once and for all. The energy begins the fusion, and both Sento and Ryuga are sent flying by a tornado. The two worlds merge, finally bringing peace.

New World

Sento upon arriving in the New World

Sento wakes up in the middle of a park where the Sky Wall originally stood, holding onto a strange stopwatch with an image of with Cross-Z on it. While wrapping his head around the situation, he realized his plan to create a new world had succeeded. Takumi, realizing that he was no longer needed, bids farewell to Sento and disappears from his mental psyche. Though the world was finally at peace, no one will know who he was or remember his good deeds... except Ryuga who reveals that he found a version of himself who was living peacefully with Kasumi. As the duo unite, they begin chronicling their journey into a 49 episode script.

Other Events

Kamen Rider Heisei Generations FINAL: Build & Ex-Aid with Legend Riders

One day, Sento had a dream where he robbed Kamen Rider Ex-Aid of his powers. He wakes up after Misora finished purifying the Doctor and Game Fullbottles. Sento tells the others about his strange dream and reveals his new RabbitTank Sparkling Fullbottle. Build and Cross-Z were later called into battle when Nebula Bugsters attacked the power plant. Build accesses the Doctor and Game Bottles to change into an form resembling Ex-Aid and manages to make a hit against the grunts. Left Kaiser appears and takes away the new bottles and as Cross-Z runs after him, he is transported into another world where the Sky Wall never existed.

After meeting Parado, Sento learns he originated from another world and spent two years tracking Build down to retrieve Ex-Aid's powers back. Soichi Isurugi appears to him and drops information on Left Kaiser's identity, Kaisei Mogami, before leaving behind the Phoenix and Robot Fullbottles. Upon further investigation of Mogami, Sento discovered he was a researcher studying parallel worlds and the Bugster Virus. He also learned that Takumi Katsuragi worked very close to him and operated in Ex-Aid's world as Build, seeking to collect Ex-Aid's powers to stop Mogami's mysterious agenda.

Sento would remain in contact with Emu Hojo and Ryuga Banjo in Ex-Aid's world, while he and Parado confront Mogami as they learn of his intentions of smashing their two Earths with his alternate doppelgänger, Right Kaiser. As the two Earths were vast approaching, Sento and Parado rode down towards Ex-Aid's worlds and reunites with Ryuga. Sento finally meets Emu Hojo for the first time and gives him the Doctor and Game Bottles to restore his powers. Build and Ex-Aid joined up with OOO, Fourze, Gaim, and Ghost as they cycled against the Foundation X Guardians, until the two managed to reach the interlocked Engima to confront Bikaiser. Build assumes the RabbitTank Sparkling form as he fights alongside Ex-Aid Muteki Gamer to turn the tide and vanquish Bikaiser together. After Build and Cross-Z say their goodbyes to the Kamen Riders, they return back to their native Earth.

Kamen Rider Build: Be The One

After intercepting stray Smash threatening a pair of siblings, Sento found himself chased down by a mob of civilians whom had been compelled to attack him. It is revealed Japan's new governors were actually members of the Blood Tribe and part of the same race as Evolto. They had been operating in the shadows up til now and declared Build an enemy of the country as they commenced the Build Annihilation Plan. Sento quickly lost all of his supporters as Sawa and Misora fell into mind control, Rogue and Grease were overwhelmed by the horde, while Ryuga was personally brainwashed by the Governor of Touto, Kengo Ino. Finding himself attacked by Ryuga, Sento was robbed of the Hazard Trigger, which was provided to Kengo Ino, who used it in the Build Driver, along with Ryuga's Great Cross-Z Dragon and the Cobra Lost Bottle, to transform into Kamen Rider Blood, combining his power with Ryuga and his fellow Blood Tribe members.

Sento would be rescued from Blood's mercy by Evolto, but remained intent on saving Ryuga. Sento soon confronted the Blood Tribe and the possessed Ryuga in the station square. Though outmatched by Blood, Build was able to land a blow which separated Ryuga from him, proceeding to purify Ryuga's mind with the power of the Genius Bottle. Knowing that a pair of Fullbottles belonging to those who reached Hazard Level 7 can defeat Blood. Misora channeled the power of Vernage to combine the Gold Rabbit and Silver Dragon Fullbottles as well as the Genius Bottle, to create the Cross-ZBuild Can, a device which enabled a transformation combining Sento and Ryuga into Kamen Rider Build Cross-ZBuild Form. Ultimately, this new power allowed them to vanquish Kamen Rider Blood and free his compulsion over the Japanese populace.

Sometime after Sento created the White Pandora Panel, it suddenly created a portal that pulled him in. Now on a mountain top, Sento discovers the past Heisei Kamen Riders fighting a platoon of enemies. Suddenly a Time Mazine lands in front of Sento and Kamen Rider Zi-O steps out, who later transforms using Build's powers to defeat the monsters down below.

Kamen Rider Heisei Generations FOREVER

Kamen Rider Build in Heisei Generations FOREVER

Sento and Ryuga were drawn into Ataru Hisanaga's world as a result of the Imagin Futaros using his powers to grant Ataru's wish of meeting Kamen Riders. They were walking into the city where they saved a boy named Shingo from being attacked by Another Double. Kazumi Sawatari as Grease and Gentoku Himuro as Rogue arrive to help Build and Cross-Z. After they fend him off, Sento and Ryuga are then confused on how Kazumi and Gentoku have their memories back. Later when they realize the boy from earlier was gone, Sento sets out to find him but gets brainwashed by the Super Time Jacker Tid to follow his bidding.

Team Build in Heisei Generations Forever.png

However, it is later revealed that it is just a facade to reveal Tid's plan. Then Sento teams up with Ryuga to fight against Another Double before Kamen Rider Zi-O finishes the Another Rider off assuming WArmor. Then, he repairs and pilots Geiz's Time Mazine to fight Tid in his Another Kuuga form. In the climax, Sento along with all Heisei Kamen Riders battle against Another Ultimate Kuuga and a horde of past monster combatants created by him before defeating the Super Time Jacker for good.

Build NEW WORLD: Kamen Rider Cross-Z

Sometime after the creation of the new world, Sento and Ryuga can be seen in a storage facility recording the last of the story they remember. After he finished recording his 49-episode script, Sento tells Ryuga to sell his various inventions in order to make income. Right when Ryuga had left, Sento becomes started by the presence of Killbus who emerges from the White Panel. After Killbus took the Build Driver from Sento, he tries to calls Ryuga to warn him about the new threat. When Killbus manages to reactivate the Pandora Box, those who were experimented on Nebula Gas were able to recall their previous world memories, allowing Sawa, Misora, Kazumi, and Gentoku to resurface in Build's support.

After Ryuga manages to regroup with the others, Sento learned that Evolto had been revived in the new world. When Ryuga handed him the Dragon Evolbottle to analyze it's data, Sento discovers that to defeat Killbus, Ryuga needs an item which amplifies Evolto's genes as much as possible. Sento warns that the process of creating this item would come with the risk of Evolto reviving at full strength and the risk of Ryuga's body exploding, risks that Ryuga is willing to take. To create the new item, Sento develops a machine to stimulate Evolto's genes inside Ryuga which successfully revives Evolto. Later, the item made to defeat Killbus is completed, and an excited Sento christens it the Muscle Galaxy Fullbottle. He then entrusts Yui to deliver it to Ryuga so he can finish the fight.

Sometime after Killbus was vanquished and Evolto left the planet, Sento continues working on his latest intentioned. It was later revealed he saved Yui Mabuchi's hospitalized students using the Genius Fullbottle's purification effects.

Build NEW WORLD: Kamen Rider Grease

Sento in NEW WORLD: Kamen Rider Grease.

While Sento helps Nariaki Utsumi raise his Hazard Level in a Nebula Gas, he and Ryuga get ambushed by one of Down Fall's Phantom Crusher. While Build and Cross-Z engage the Phantom Crusher, he negates their transformation and takes both the Hazard Trigger and White Panel. After regrouping with Kazumi, he questions how he manages to maintain his transformation and learns he and the Hokuto Sanbagarasu had bathed in a hot spring that actually contained Phantom Liquid.

Sento reunites with Takumi Katsuragi in order to study the Phantom Liquid's effects. He devises a new power-up item that harnesses the power of Phantom Liquid specifically made for Kazumi. After the Hokuto Sanbagarasu were injured during a battle with Metal Build, Sento presented Kazumi with the Perfect Kingdom adapter but advised him that it is lacking in Phantom Liquid to complete it. Although he revealed the rest of the Phantom Liquid could be extracted from the Hokuto Sanbagarasu, it would put their lives at risk which Kazumi refused. However, much to Sento's horror, the three offered to sacrifice themselves to complete the Perfect Kingdom adapter.

Once Sento retrieves Utsumi out from the Nebula Gas capsule, he also created a replica Evol-Driver for him to use in the awaiting fight against Down Fall During Kazami's fight against Phantom Build, he is joined by Sento, Utsumi, Ryuga, and Gentoku, and they all transform into Kamen Riders and engage the Phantom Crushers. After the battle, Kazumi discovered the Hokuto Sanbagarasu were alive the entire time and Sento deliberately lied about their survival to raise Kazumi's Hazard Level.

Personality

"Me and him...We fought to become strength for others. To protect people...we kept rising back up. Even without you...I still have people to protect. For the justice I believe in...I will defeat you!"
―Sento proving his justice to Blood Stalk.[src]

Originally a man with no memories of his past, one of the greatest traits Sento has kept from the transition from Takumi is his genius-level intellect, which he has displayed numerous times with his advanced knowledge of science, mathematics, engineering, and cryptography. Sento is easily attracted to anything he deems mysterious or interesting, such as a new innovation or a lead towards uncovering his past, and will relentlessly pursue it. This will continue until either he reaches a conclusion or someone forcibly stops him during progress. When Sento gets excited (usually due to a discovery or breakthrough), he receives an ahoge, a single lock of hair that typically represents a person with a foolish and carefree personality, traits that are not entirely absent in Sento.

Another trait that is carried over from Takumi is his polymathism, which is accompanied by an inflated ego and sharp tongue: he likes to praise himself for his works, and often mocks Ryuga for his comparatively lower intelligence. Sento often relies on his own skills to solve problems and never expects sudden assistance from others, so when it happens, he tends to either be surprised or turns them down. Also, Sento can be easily caught off guard when he accomplishes anything or witnesses something unexpected and new which excites him, because of his reliance on his intellect. In this state, he is vulnerable to any surprise attacks.

Perhaps Sento's greatest and most well-known trait is his "superhero like" sense of justice, which Sento is said to have uniquely created all on his own, separate from Takumi's natural anti-heroic nature. A firm pacifist, he believes that science should be used for the sake of humanity, and harshly opposes using it for war. His selflessness and sense of duty causes him to try and shoulder the burden alone rather than involve others, whether he can carry that burden or not. This altruism intensifies the guilt he feels for his role in creating the Smash and escalating the war. While generally calm and composed, Sento is prone to making poor judgement during emotional turmoil.

Sento has a couple of catchphrases:

  • Pre-transformation: "Now, shall we begin the experiment?" (さあ、実験を始めようか?, Sā, jikken o hajimeyou ka?).
    • Varient in Kamen Rider Build: Be The One: "Now, shall we begin the final experiment?" (さあ、最後の実験を始めようか?, Sa, saigo no jikken o hajimeyou ka).
  • Post-transformation: "The laws of victory is set." (勝利の法則は決まった, Shōri no hōsoku wa kimatta).

Family

Powers and Abilities

Powers

  • Artificially Enhanced Physiology: Sento underwent an experiment from Faust which injected him with a certain amount of Nebula Gas, which has enhanced his physical condition to a certain degree. To be noted that as his Hazard Level increases, his physical condition increases as well. Since his body was presumably been experimented on beforehand, as Takumi Katsuragi was able to become Build in previous occasions, he didn't mutate into a Smash and the gas retained his body without side affects apart from memory loss (mostly inflicted by Blood Stalk). As result, his initial Hazard Level starts at Level 3, which allows subjects like him to utilize the Build Driver to transform into Kamen Rider Build. Later, his Hazard level rose to 3.7 due to his anger during the battle against Blood Stalk. After continuous usage of the RabbitTank Sparkling Fullbottle, his Hazard level rose to 3.9; and after continuous use of the Hazard Trigger, his hazard level was at 4.4 according to Blood Stalk, last time it was measured. By using a panel from the Pandora Box in the Build Driver, Sento was able to raise his Hazard Level to 6, a feat that should not be possible for a human being. Soon after he raised it to 6.3+ by cranking the Build Driver's Vortex Lever. During his fight with the CD Lost Smash and Shinobu Katsuragi as another Build, Sento raised his Hazard level to 7.
  • Fullbottle Augmentation: By shaking a Fullbottle in his hand, regardless of whether he is transformed or not, Sento can gain abilities based on said Fullbottle's traits.
    • Rabbit: Allows Sento to gain fast reflexes. First used to defeat Ryuga Banjo in a one-on-one fight.
    • Gold Rabbit: Allows Sento to perform powerful punches. First used to defeat Shinobu Katsuragi's version of Build.
    • Gorilla: Allows Sento to perform fiery punches. First used to fight Ryuga Banjo.
  • Fourth-Wall Interaction: Used only for comical purposes, Sento is capable of interacting with Ryuga's recollection of his birth in various ways. This normally involves said recollection being thrown away or knocked off-screen somehow.
  • Hazard Level Measurement: Sento gained this ability following his acquisition of Genius Form. He was able to detect Evolto's rising Hazard Level while fighting him.

Abilities

  • Genius-Level Intellect: Sento's most defining trait is his intelligence. He is a genius in several fields of science and has an advanced knowledge of particularly both physics and chemistry. Thus, he created majority of Build's accessories and modified from Evol-Driver and Evol-Trigger to create Build Driver and Hazard Trigger that they would be safe to use by humans, all of Cross-Z's equipment on his own, some equipment and Fullbottles for Grease and Rogue. Since regaining his memories of Takumi Katsuragi, his intellect has combined with the latter as well, enabling him to complete Project Build.
  • Master Scientist: A exceptional scientific prodigy, Sento is a ingeniously resourceful, knowledgeable, and brilliant scientist who is well-educated in many different fields of science, including physics, chemistry, and advanced mathematics. This is publicly proven through his perfect test score on a difficult physics test administered by the Touto Institute of Advanced Matter Physics. This proves a significant asset in battle, which Sento incorporates into his fighting technique with his science knowledge. He cultivated and activated inert Evolto Cells despite Evolto being a completely alien life form. Moreover, he masters the usage of in his technology a Gas that warps Physics and Space-Time (The Sky Wall notably had Bugster Viruses in them which is not found in Build's Universe but rather Ex-Aid's).
  • Master Engineer: Sento is an extremely talented and prolific engineer and technician, having been able to make many complicated inventions. Since inheriting Project Build, Sento has showcased an immense and prolific talent in engineering by developing the majority, if not all, of the equipment used by himself and the rest of Team Build. He is also a master craftsman. Hence, he created fake versions of his gear to use as bait, which were completely indistinguishable from the genuine article with the naked eye. He has also made a modified microwave machine in Nascita's basement, and through Vernage's power inside of Misora Isurugi's bracelet to purified the harmful properties in Smash Bottle, leading to the creation of a Fullbottle which can then be used by Build.
  • Time Travel Knowledge: Sento also seems to understand the fundamentals of time travel as well, as he is able to maintain the bootstrap paradox previously established by Sougo, in fact that he is currently the only legacy Rider in Zi-O to remember Sougo giving him the blank Ridewatch and return it, knowing Sougo is a time traveler. In Heisei Generations FOREVER, he was able to repair a time machine without prior knowledge on how it works, though it most likely stems from his previous encounter with Sougo before the latter had even met him in the first place.
  • Expert Tactician: Sento has shown himself to be a capable strategist, being able to outwit Blood Stalk on two occasions as well as Namba.
  • Skilled Combatant: To be added
  • Bilingualism: Sento speaks his native Japanese, and can possibly speak English as he able to read files written in English entirely and perfectly translate it back to Japanese verbally.

Weaknesses

  • Form Data: As seen on Utsumi's tablet, Namba has data on most of Build's Best Match forms, including tactical data for countering them. They also have data and counters for RabbitRabbit Form, which they used against Sento in the fight with Rogue. Hypothetically, any of Sento's forms can be countered, provided they're analyzed and the opponent is powerful enough to utilize the counters.
  • Hazard Trigger: If Sento uses the Hazard Trigger for too long within the Super Best Match, it will overstimulate his nervous system and send him into a mindless rampage, destroying anything and anyone in his path until his transformation is cancelled. Raising Sento's Hazard Level appears to prolong the amount of time he can use the Trigger with his consciousness intact. Sento can overcome the effects of the Hazard Trigger by using it along with the FullFull RabbitTank Bottle. When the Force Ride Meter on the Trigger is struck forcefully with an attack, it will paralyze him for a period of time. This weakness is carried over from the Evol-Trigger, which the Hazard Trigger is based on. By the end of the series, Sento's Hazard Level has become high enough to allow him to use the raw Hazard Form long enough to defeat an opponent before losing control, though ultimately it will eventually overwhelm him.
  • Negative Emotions: Since Sento's acquisition of Genius Form, the form is entirely based around Sento's heroic traits and will not activate should he lose those traits. The first instance of this happening was when the bottle was first completed and Takumi attempted to use it, and could not since he did not have any trust whatsoever in anyone. The second instance was shortly after Evolto had killed Shinobu Katsuragi, causing Sento to enter a fit of rage that prevented the Genius Bottle from activating.

Former Weaknesses

  • Dragon Fullbottle: As seen in episode 10, Sento's body cannot handle the Dragon Fullbottle's power as he transforms into Build KeyDragon, which causes him to be electrified by the energy surges and experiences intense pain. Further use of the Dragon Bottle causes his body to be engulfed in flame-like energy which hurts him even more and forcibly knocks Sento out of his transformation. This was due to Ryuga's Hazard Level 3 synchronizing more effectively with the Dragon Full Bottle from prolonged use and exposure to its energy, while Sento had never used it before. Sento uses the Dragon Bottle in the finale for his RabbitDragon form when he is finally above Hazard Level 7, giving him a complete control.
    • Dragon Jelly: Sento is also incapable of using this item as well when he uses Banjou's Sclash Driver.
  • Hazard Kill Switch: With Utsumi's help, Sento designed a switch that would allow the user to overload and destroy the Hazard Trigger, killing Sento in the process, should he ever lose control while using it. However, Sento has came up with an idea on countering the side effects of the Hazard Trigger by using the broken fragments of the Low Rabbit Fullbottle as a basis, thus the creation of the FullFull RabbitTank Bottle.
  • Alien Poison: Due to Evolto's poison injecting on him, Sento will suffer panic attacks and a high health risk, right until Evolto removes it from his body after a few hours while possessing Ryuga. This goes the same for Killbus, however, Sento manages to cure himself with the Genius Fullbottle.

Forms

Kamen Rider Build can assume a variety of different forms, called Trial Forms (トライアルフォーム, Toraiaru Fōmu), using different combinations of Fullbottles. However, each one has a Best Match (ベストマッチ, Besuto Matchi) with another Fullbottle that creates an especially powerful form. Best Matches usually have unique names in comparison to other mismatched forms, and the caps of Fullbottles indicate what Fullbottle is its Best Match.

Build initiates a finishing attack by turning the Build Driver's Vortex Crank again. The finisher of all Trial Forms is called the Vortex Attack (ボルテックアタック, Borutekku Atakku), while the finisher of the Best Matches is called the Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu).

In any form that uses the Rabbit Fullbottle, Build is armed with the Rabbit Foot Shoes (ラビットフットシューズ, Rabitto Futto Shūzu) on his left leg for increased jumping.

RabbitTank Form

RabbitTank Form

"Rabbit! Tank! Best Match! Are you ready? (Techno rock music) Hagane no moonsault! RabbitTank! Yeah!"
―RabbitTank's transformation announcement[src]

Rider Statistics

  • Rider Height: 196 cm.
  • Rider Weight: 99 kg.

Ability Parameters:

  • Punching Power: 9.9 t. (right arm)/17 t. (left arm)
  • Kicking Power: 23.7 t. (right leg)/17.8 t. (left leg)
  • Maximum Jump Height: 55 m.
  • Maximum Running Speed: 100 m. per 2.9 sec.

RabbitTank Form (ラビットタンクフォーム, Rabitto Tanku Fōmu) is Build's red and blue primary and default Best Match form form accessed from the Rabbit and Tank Fullbottles, hence known as the Moonsault of Steel (鋼のムーンサルト, Hagane no Mūnsaruto). It is a Touto Best Match, and is themed after a rabbit and a tank.

Being Build's most balanced (and second fastest) form, RabbitTank is the Best Match form favored by Sento, despite being able to transform with any Fullbottles. The Rabbit and Tank Fullbottles are noted as having a particularly high synergy with each other and compatibility with various mechanisms, thus RabbitTank is the basis of several upgraded forms Build can access.

In this Best Match form, Build is armed with the Tank Roller Shoes (タンクローラーシューズ, Tanku Rōrā Shūzu) on his right leg for kicking attacks, and can also act as a working tread to roll along on a flat surface.

This form's weapon is the Drill Crusher. In the final episode, Build uses the Fullbottle Buster while in this form.

As a Best Match, this form has two finishers:

  • Build Driver finisher:
    • Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu): Build dives underground to send a white energy chart flying up to the surface with the dotted line securing the enemy before leaping back up, and delivering a kick whilst riding the chart's line. According to Blood Stalk, this finisher has a Hazard Level of 3.2, and then 3.7 when Build attacks him out of anger.
  • Drill Crusher finisher:
    • Vortex Break (ボルテックブレイク, Borutekku Bureiku):
      • Blade Mode: Build channels the energy of a Fullbottle in his Drill Crusher and performs a powerful slash.
        • Biotic:
          • Rabbit: The Drill Spiral Blade spins such that it creates an energy whirlpool before Build performs a red energy slash.
          • Gorilla: The Drill Spiral Blade cloaks itself in an energy projection that bears a striking resemblance to the Muscle Glove.
          • Ninjya: Purple energy Drill Spiral Blades are projected and spin violently around the Drill Crusher.
        • Abiotic:
          • Rocket: The Drill Crusher charges at the enemy and attacks like a rocket.
      • Gun Mode: Build channels the energy of a Fullbottle in his Drill Crusher and performs a powerful blast.
        • Harinezumi: Build shoots white energy spikes at the enemy.
  • Fullbottle Buster finisher:
    • Just Match Break (ジャストマッチブレイク, Jasuto Matchi Bureiku): Build channels the power of two Fullbottles for a powerful attack.
      • Buster Blade Mode
        • Gold Rabbit + Silver Dragon: Build jumps into the air and performs a powerful downward slash covered in gold and silver energy, followed by two horizontal slashes.
Appearances: Build Episodes 1-2, Transformation Lessons: Kamen Rider Build Chapter, Build 3, 5-7, 10, 13 (flashback), 14, Heisei Generations FINAL: Build & Ex-Aid with Legend Riders, Build 15-17, Birth! KumaTV!! VS Kamen Rider Grease!, Build 21-25, 30, Be The One, Build 49, Kamen Rider Build: Final Stage, Heisei Generations FOREVER, Zi-O Episodes 39, 41, Kamen Rider Zi-O: Over Quartzer, Kamen Rider: Reiwa The First Generation, Kamen Rider Saber + Kikai Sentai Zenkaiger: Superhero SenkiIcon-crosswiki.png

RabbitSoujiki Form

RabbitSoujiki Form

"Rabbit! Soujiki! Are you ready? (Funky music)"
―RabbitSoujiki's transformation announcement[src]

Rider Statistics

  • Rider Height: 196 cm.
  • Rider Weight: 93.7 kg.

Ability Parameters:

  • Punching Power: 7.9 t. (right arm)/5.7 t. (left arm)
  • Kicking Power: 9.6 t. (right leg)/14.2 t. (left leg)
  • Maximum Jump Height: 38.4 m.
  • Maximum Running Speed: 100 m. per 3.9 sec.

RabbitSoujiki Form (ラビット掃除機フォーム, Rabitto Sōjiki Fōmu) is Build's red and turquoise Trial Form accessed through the Rabbit and Soujiki Fullbottles, themed after a rabbit and a vacuum cleaner.

In this Trial Form, Build is armed with the Long Range Cleaner (ロングレンジクリーナー, Rongu Renji Kurīnā) on his left arm that can suck things in with high-velocity winds, and the Trash Converter (トラッシュコンバーター, Torasshu Konbātā) on his left shoulder that stores what has been sucked in.

This Trial Form gives Build the ability to absorb any elemental attacks using the Long Range Cleaner, and safely disarm the accumulated attack using the Trash Converter. However, this comes at the cost of all of his Ability Parameters being decreased from RabbitTank.

As a mismatched form, this form's finisher is the Vortex Attack (ボルテックアタック, Borutekku Atakku).

This form is exclusive to Kamen Rider Build Episode 2.

RabbitGatling Form

RabbitGatling Form

"Rabbit! Gatling! Are you ready? (Funky music)"
―RabbitGatling's transformation announcement[src]

Rider Statistics

  • Rider Height: 196 cm.
  • Rider Weight: 95 kg.

Ability Parameters:

  • Punching Power: 7.9 t. (right arm)/8 t. (left arm)
  • Kicking Power: 10.8 t. (right leg)/14.2 t. (left leg)
  • Maximum Jump Height: 37.7 m.
  • Maximum Running Speed: 100 m. per 6.2 sec.

RabbitGatling Form (ラビットガトリングフォーム, Rabitto Gatoringu Fōmu) is Build's red and gray Trial Form accessed through the Rabbit and Gatling Fullbottles, themed after a rabbit and a gatling gun.

In this Trial Form, Build is armed with the Hawk Gatlinger and Drill Crusher.

As a mismatched form, this form's finisher is the Vortex Attack (ボルテックアタック, Borutekku Atakku).

This form is exclusive to Kamen Rider Build Episode 4.

Trial Forms
"Rabbit! (Abiotic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]

As mismatched forms, the finisher is the Vortex Attack (ボルテックアタック, Borutekku Atakku).

These forms have yet to appear in any episode, movie, or special.

In any form that uses the Gorilla Fullbottle, Build is armed with the Muscle Glove (マッスルグローブ, Massuru Gurōbu) on his right arm for enhanced punching.

GorillaMond Form

GorillaMond Form

"Gorilla! Diamond! Best Match! Are you ready? (Tropical rock music) Kagayaki no destroyer! GorillaMond! Yeah!"
―GorillaMond's transformation announcement[src]

Rider Statistics

  • Rider Height: 189 cm.
  • Rider Weight: 112 kg.

Ability Parameters:

  • Punching Power: 25.9 t. (right arm)/15.8 t. (left arm)
  • Kicking Power: 17.3 t. (right leg)/16.5 t. (left leg)
  • Maximum Jump Height: 32.5 m.
  • Maximum Running Speed: 100 m. per 8.4 sec.

GorillaMond Form (ゴリラモンドフォーム, Goriramondo Fōmu) is Build's brown and cyan second Best Match form accessed from the Gorilla and Diamond Fullbottles, hence known as the Shining Destroyer (輝きのデストロヤー, Kagayaki no Desutoroyā). It is a Touto Best Match, and is themed after a gorilla and a diamond.

In this Best Match form, Build is armed with the BLD Prism Glove (BLDプリズムグローブ, BLD Purizumu Gurōbu) on his left hand.

GorillaMond shows an increase in power, as the Punching Power of Build is significantly higher than in RabbitTank, albeit with a slightly decreased amount in its left arm, but it lacks Kicking Power and agility compared to RabbitTank. His left arm can convert abiotic objects, or even weakened enemies, into diamonds.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu): This finisher has two variations:

  • Build uses the BLD Prism Glove to create a gust full of diamonds and uses the Muscle Glove to punch them at the enemy. The diamonds creates a tornado that causes a human to separate from his/her Smash form, then Build punches the Smash inside the tornado, destroying it.
  • Build stops an enemy's projectile attack in mid-air with the BLD Prism Glove, altering the projectile's atomic structure into a diamond shield. He then punches the shield with the Muscle Glove, shattering it and sending the shards flying at the enemy at high speeds.
Appearances: Build Episode 2, Transformation Lessons: Kamen Rider Build Chapter, Build 3-4, 6

GorillaSoujiki Form

GorillaSoujiki Form

"Gorilla! Soujiki! Are you ready? (Funky music)"
―GorillaSoujiki's transformation announcement[src]

Rider Statistics

  • Rider Height: 189 cm.
  • Rider Weight: 111.7 kg.

Ability Parameters:

  • Punching Power: 20.7 t. (right arm)/5.7 t. (left arm)
  • Kicking Power: 9.6 t. (right leg)/13.2 t. (left leg)
  • Maximum Jump Height: 26.5 m.
  • Maximum Running Speed: 100 m. per 6.2 sec.

GorillaSoujiki Form (ゴリラ掃除機フォーム, Gorira Sōjiki Fōmu) is Build's brown and turquoise Trial Form accessed through the Gorilla and Soujiki Fullbottles, themed after a gorilla and a vacuum cleaner.

In this Trial Form, Build is armed with the Long Range Cleaner (ロングレンジクリーナー, Rongu Renji Kurīnā) on his left arm that can suck things in with high-velocity winds, and the Trash Converter (トラッシュコンバーター, Torasshu Konbātā) on his left shoulder that stores what has been sucked in.

As a mismatched form, this form's finisher is the Vortex Attack (ボルテックアタック, Borutekku Atakku).

This form is exclusive to Kamen Rider Build Episode 3.

GorillaRocket Form

GorillaRocket Form

"Gorilla! Rocket! Are you ready? (Funky music)"
―GorillaRocket's transformation announcement[src]

Rider Statistics

  • Rider Height: 189 cm.
  • Rider Weight: 115 kg.

Ability Parameters:

  • Punching Power: 20.7 t. (right arm)/11.6 t. (left arm)
  • Kicking Power: 13.5 t. (right leg)/13.2 t. (left leg)
  • Maximum Jump Height: 32.5 m.
  • Maximum Running Speed: 100 m. per 9.1 sec.

GorillaRocket Form (ゴリラロケットフォーム, Gorira Roketto Fōmu) is Build's brown and light blue Trial Form accessed through the Gorilla and Rocket Fullbottles, themed after a gorilla and a rocket.

In this Trial Form, Build is armed with the Space Ride Arm (スペースライドアーム, Supēsu Raido Āmu) on his left arm that can fly off as a rocket and ram the opponent, and let him fly.

As a mismatched form, this form's finisher is the Vortex Attack (ボルテックアタック, Borutekku Atakku).

This form is exclusive to Kamen Rider Build Episode 8

Trial Forms
"Gorilla! (Abiotic Fullbottle name)! Are you ready?"
―Trial Forms' transformation announcement[src]

As mismatched forms, the finisher is the Vortex Attack (ボルテックアタック, Borutekku Atakku).

These forms have yet to appear in any episode, movie, or special.

In any form that uses the Taka Fullbottle, Build is armed with the Celestial Wings (ソレスタルウィング, Soresutaru Wingu) on his back that grant him the ability to fly, along with the Hawk Gatlinger. [1]

HawkGatling Form

HawkGatling Form

Extended wings

"Taka! Gatling! Best Match! Are you ready? (Brass band music) Tenkuu no abarenbou! HawkGatling! Yeah!"
―HawkGatling's transformation announcement[src]

Rider Statistics

  • Rider Height: 193 cm.
  • Rider Weight: 107 kg.

Ability Parameters:

  • Punching Power: 9.7 t. (right arm)/10 t. (left arm)
  • Kicking Power: 13.5 t. (right leg)/14.2 t. (left leg)
  • Maximum Jump Height: 41.7 m.
  • Maximum Running Speed: 100 m. per 5.8 sec.

HawkGatling Form (ホークガトリングフォーム, Hōku Gatoringu Fōmu) is Build's orange and gray Best Match form accessed with the Taka and Gatling Fullbottles, hence known as the Rampage of the Skies (天空の暴れん坊, Tenkū no Abarenbō). It is a Touto Best Match, and is themed after a hawk and a gatling gun.

While this Best Match has low stats compared to RabbitTank, this is made up for by the Celestial Wings on his back which grant him flight capabilities, as well as the utilization of the Gatling Fullbottle's Hawk Gatlinger that was designed for this particular Best Match.

As a Best Match, this form has two finishers:

  • Build Driver finisher:
    • Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu).
  • Hawk Gatlinger finisher:
    • Full Bullet (フルブレット, Furu Buretto): Build spins the Revol-Magazine ten times causing the gun to surround itself and its wielder with a white energy spherical graph that traps all enemies in mid-air before firing upon them all.
Appearances: Build Episodes 3-5, 8-10, 13, Heisei Generations FINAL: Build & Ex-Aid with Legend Riders, Build 16, 20, 24, Be The One, 49 (flashback; archive footage only), Kamen Rider Build: Final Stage

Trial Forms
"Taka! (Abiotic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]

As mismatched forms, the finisher is the Vortex Attack (ボルテックアタック, Borutekku Atakku).

These forms have yet to appear in any episode, movie, or special.

In any form that uses the Ninjya Fullbottle, Build wields the 4Koma Ninpoutou. It also grants Build the Onmitsu Scarf (オンミツスカーフ, Onmitsu Sukāfu) on the right side of his back.

NinninComic Form

NinninComic Form

"Ninjya! Comic! Best Match! Are you ready? (Surfer rock music) Shinobi no entertainer! NinninComic! Yeah!"
―NinninComic's transformation announcement[src]

Rider Statistics

  • Rider Height: 194 cm.
  • Rider Weight: 90.5 kg.

Ability Parameters:

  • Punching Power: 11.1 t. (right arm)/8.8 t. (left arm)
  • Kicking Power: 10.1 t. (right leg)/22.2 t. (left leg)
  • Maximum Jump Height: 45.4 m.
  • Maximum Running Speed: 100 m. per 4.2 sec.

NinninComic Form (ニンニンコミックフォーム, Ninnin Komikku Fōmu) is Build's purple and yellow Best Match form accessed with the Ninjya and Comic Fullbottles, hence known as the Stealthy Entertainer (忍びのエンターテイナー, Shinobi no Entāteinā). It is a Touto Best Match, and is themed after a ninja and a comic book.

This form grants Build well-balanced abilities akin of RabbitTank. Furthermore, it has increased kicking and punching power with the cost of jumping power and speed. The 4Koma Ninpoutou was designed for this particular Best Match. This is also Build's fourth fastest form.

Additionally, thanks to the stretchable Onmitsu Scarf, Build can wrap his entire body in it to camoflauge himself with local scenery, rendering him almost invisible.

As a Best Match, this form has several finishers:

  • Build Driver finisher:
    • Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu)
  • 4Koma Ninpoutou finishers:
    • Clone Jutsu (分身の術, Bunshin no Jutsu, Art of Cloning): Build presses the Vortex Trigger one time and creates a number of clones of himself that attack together.
    • Fire Jutsu (火遁の術, Katon no Jutsu, Art of Fire Releasing): Build presses the Vortex Trigger two times and delivers a flaming slash attack. While performing this attack, the 4Koma Ninpoutou announces Blazing Slash (火炎斬り, Kaen Giri).
    • Wind Jutsu (風遁の術, Fūton no Jutsu, Art of Wind Releasing): Build presses the Vortex Trigger three times and creates a tornado around the blade. While performing this attack, the 4Koma Ninpoutou announces Tornado Slash (竜巻斬り, Tatsumaki Giri).
    • Stealth Jutsu (隠れ身の術, Kakuremi no Jutsu, Art of Camouflage): Build presses the Vortex Trigger four times and teleports a short distance away in a puff of smoke. While performing this attack, the 4Koma Ninpoutou announces Doron (ドロン, Doron, lit. "Abscond"), with a heavy drumbeat when he disappears and reappears.
Appearances: Build Episodes 5-7, 9, 12-13, Heisei Generations FINAL: Build & Ex-Aid with Legend Riders, Build 16, Birth! KumaTV!! VS Kamen Rider Grease!, Build 20, Kamen Rider Build: Final Stage

NinjyaTank Form

NinjyaTank Form

"Ninjya! Tank! Are you ready? (Funky music)"
―NinjyaTank's transformation announcement[src]

Rider Statistics

  • Rider Height: 194 cm.
  • Rider Weight: 101.1 kg.

Ability Parameters:

  • Punching Power: 8.9 t. (right arm)/13.6 t. (left arm)
  • Kicking Power: 19 t. (right leg)/17.8 t. (left leg)
  • Maximum Jump Height: 32.3 m.
  • Maximum Running Speed: 100 m. per 2.3 sec.

NinjyaTank Form (忍者タンクフォーム, Ninja Tanku Fōmu) is Build's purple and blue Trial Form accessed through the Ninjya and Tank Fullbottles, themed after a ninja and a tank.

In this Trial Form, Build is armed with the Tank Roller Shoes (タンクローラーシューズ, Tanku Rōrā Shūzu) on his right leg for kicking attacks, and can also act as a working tread to roll along on a flat foot, as well as the Drill Crusher.

As a mismatched form, this form's finisher is the Vortex Attack (ボルテックアタック, Borutekku Atakku).

This form is exclusive to Kamen Rider Build Episode 6

Trial Forms
"Ninjya! (Abiotic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]

As mismatched forms, the finisher is the Vortex Attack (ボルテックアタック, Borutekku Atakku).

These forms have yet to appear in any episode, movie, or special.

In any form that uses the Panda Fullbottle, Build is armed with the Giant Scratcher (ジャイアントスクラッチャー, Jaianto Sukuracchā) claws on his right hand.

RocketPanda Form

RocketPanda Form

"Panda! Rocket! Best Match! Are you ready? (Orchestra music) Buttobi monotone! RocketPanda! Yeah!"
―RocketPanda's transformation announcement[src]

Rider Statistics

  • Rider Height: 189 cm.
  • Rider Weight: 114 kg.

Ability Parameters:

  • Punching Power: 18.8 t. (right arm)/14.5 t. (left arm)
  • Kicking Power: 16.9 t. (right leg)/15.4 t. (left leg)
  • Maximum Jump Height: 43.6 m.
  • Maximum Running Speed: 100 m. per 8.5 sec

RocketPanda Form (ロケットパンダフォーム, Roketto Panda Fōmu) is Build's snow white and light blue Best Match form accessed with the Rocket and Panda Fullbottles, hence known as the Flying Monotone (ぶっ飛びモノトーン, Buttobi Monotōn). It is a Touto Best Match, and is themed after a panda and a rocket.

In this Best Match form, Build is armed with the Space Ride Arm (スペースライドアーム, Supēsu Raido Āmu) on his left arm that can fly off as a rocket and ram the opponent, and let him fly.

This form grants Build a balanced boost in punching, kicking and jumping power, albeit his speed is the slowest of all forms so far.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu): Build surrounds the enemy with a white, oval-shaped energy chart, then uses the Space Ride Arm to fly at the enemy and performs a series of slashes with the Giant Scratcher. The chart goes up as Build continues to slash the enemy.

Appearances: Build Episode 7-8, 15, 18, 20

PandaGatling Form

PandaGatling Form

"Panda! Gatling! Are you ready? (Funky music)"
―PandaGatling's transformation announcement[src]

Rider Statistics

  • Rider Height: 189 cm.
  • Rider Weight: 112 kg.

Ability Parameters:

  • Punching Power: 15 t. (right arm)/8 t. (left arm)
  • Kicking Power: 10.8 t. (right leg)/12.3 t. (left leg)
  • Maximum Jump Height: 26.6 m.
  • Maximum Running Speed: 100 m. per 8.6 sec.

PandaGatling Form (パンダガトリングフォーム, Panda Gatoringu Fōmu) is Build's snow white and gray Trial Form accessed through the Panda and Gatling Fullbottles, themed after a panda bear and a gatling gun.

In this Trial Form, Build is armed with the Hawk Gatlinger.

As a mismatched form, this form's finisher is the Vortex Attack (ボルテックアタック, Borutekku Atakku).

This form is exclusive to Kamen Rider Build Episode 7

Trial Forms
"Panda! (Abiotic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]

As mismatched forms, the finisher is the Vortex Attack (ボルテックアタック, Borutekku Atakku).

These forms have yet to appear in any episode, movie, or special.

In any form that uses the Harinezumi Fullbottle, Build is armed with the Spine Knuckle (スパインナックル, Supain Nakkuru) on his right fist, allowing him to clobber foes with spikes that extend outwards when used.

FireHedgehog Form

FireHedgehog Form

"Harinezumi! Syoubousya! Best Match! Are you ready? (Rock music with sirens) Rescue kenzan! FireHedgehog! Yeah!"
―FireHedgehog's transformation announcement[src]

Rider Statistics

  • Rider Height: 190 cm.
  • Rider Weight: 103.7 kg.

Ability Parameters:

  • Punching Power: 13.7 t. (right arm)/11.9 t. (left arm)
  • Kicking Power: 14.7 t. (right leg)/14 t. (left leg)
  • Maximum Jump Height: 36.5 m.
  • Maximum Running Speed: 100 m. per 6.4 sec.

FireHedgehog Form (ファイヤヘッジホッグフォーム, Faiya Hejjihoggu Fōmu) is Build's white and scarlet-colored Best Match form accessed from the Harinezumi and Syoubousya Fullbottles, hence known as the Rescue Kenzan (レスキュー剣山, Resukyū Kenzan). It is a Touto Best Match, and is themed after a hedgehog and a fire engine.

In this Best Match form, Build is armed with the Multi Deluge Gun (マルチデリュージガン, Maruchi Deryūji Gan) on his left arm that can shoot water, fire, or extend.

This form give build balanced boost in punching, kicking and jumping power, albeit at the cost of his running speed.


As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu): Build extends the Multi Deluge Gun and uses it to stab the enemy, then fills them up with water and surrounds them with a white energy chart before jumping up such that he's perpendicular with the ground, then dropping down, and punching the enemy with the Spine Knuckle.

Appearances: Build Episode 8, 10, 15, 19

HarinezumiTank Form

HarinezumiTank Form

"Harinezumi! Tank! Are you ready? (Funky music)"
―HarinezumiTank's transformation announcement[src]

Rider Statistics

  • Rider Height: 194 cm.
  • Rider Weight: 102.7 kg.

Ability Parameters:

  • Punching Power: 11 t. (right arm)/13.6 t. (left arm)
  • Kicking Power: 19 t. (right leg)/11.2 t. (left leg)
  • Maximum Jump Height: 28.4 m.
  • Maximum Running Speed: 100 m. per 7 sec.

HarinezumiTank Form (ハリネズミタンクフォーム, Harinezumi Tanku Fōmu) is Build's white and blue Trial Form accessed through the Harinezumi and Tank Fullbottles, themed after a hedgehog and a tank.

Compared to RabbitTank, this Trial Form has a stronger amount of Punching Power in its right arm, while being weaker in the left. The rest of the Ability Parameters are overall much worse in comparison.

In this Trial Form, Build is armed with the Tank Roller Shoes (タンクローラーシューズ, Tanku Rōrā Shūzu) on his right leg for kicking attacks, and can also act as a working tread to roll along on a flat foot.

As a mismatched form, this form's finisher is the Vortex Attack (ボルテックアタック, Borutekku Atakku).

Appearances: Build Episodes 1-2

Trial Forms
"Harinezumi! (Abiotic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]

As mismatched forms, the finisher is the Vortex Attack (ボルテックアタック, Borutekku Atakku).

These forms have yet to appear in any episode, movie, or special.

In any form that uses the Lion Fullbottle, Build is armed with the Gold Lio Gauntlet (ゴルドライオガントレット, Gorudo Raio Gantoretto) on his right arm that lets him shoot bursts of yellow energy by punching.

LionCleaner Form

LionCleaner Form

"Lion! Soujiki! Best Match! Are you ready? (Techno rock music) Tategami cyclone! LionCleaner! Yeah!"
―LionCleaner's transformation announcement[src]

Rider Statistics

  • Rider Height: 189 cm.
  • Rider Weight: 104.3 kg.

Ability Parameters:

  • Punching Power: 17.4 t. (right arm)/7.1 t. (left arm)
  • Kicking Power: 12 t. (right leg)/21.3 t. (left leg)
  • Maximum Jump Height: 39 m.
  • Maximum Running Speed: 100 m. per 3.6 sec.

LionCleaner Form (ライオンクリーナーフォーム, Raion Kurīnā Fōmu) is Build's marigold and turquoise Best Match form accessed with the Lion and Soujiki Fullbottles, hence known as the Mane Cyclone (鬣サイクロン, Tategami Saikuron). It is a Touto Best Match, and is themed after a lion and a vacuum cleaner.

In this Best Match form, Build is armed with the Long Range Cleaner (ロングレンジクリーナー, Rongu Renji Kurīnā) on his left arm that can suck things in with high-velocity winds, and the Trash Converter (トラッシュコンバーター, Torasshu Konbātā) on his left shoulder that stores what has been sucked in.

This form grants Build a balanced boost in all his ability parameters. This is also Build's third fastest form.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu): Build uses the Long Range Cleaner to suck the enemy towards him, holding it in place, before coating the Gold Lio Gauntlet in yellow energy, then firing off an energy lion head that bites the opponent on contact.

Though Build possessed both Fullbottles needed for this form for an extended time and seemingly knew of their Best Match, he didn't use them until much later, likely because Lion was always being used for the Machine Builder.

Appearances: Build Episodes 9-10, 15

LionComic Form

LionComic Form

"Lion! Comic! Are you ready? (Funky music)"
―LionComic's transformation announcement[src]

Rider Statistics

  • Rider Height: 194 cm.
  • Rider Weight: 99 kg.

Ability Parameters:

  • Punching Power: 13.9 t. (right arm)/7 t. (left arm)
  • Kicking Power: 8.1 t. (right leg)/17 t. (left leg)
  • Maximum Jump Height: 32.8 m.
  • Maximum Running Speed: 100 m. per 5.6 sec.

LionComic Form (ライオンコミックフォーム, Raion Komikku Fōmu) is Build's marigold and yellow Trial Form accessed with the Lion and Comic Fullbottles, themed after a lion and a comic book.

In this Trial Form, Build is armed with the 4Koma Ninpoutou.

As a mismatched form, this form's finisher is the Vortex Attack (ボルテックアタック, Borutekku Atakku)

This form is exclusive to Kamen Rider Build Episode 15

Trial Forms
"Lion! (Abiotic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]

As mismatched forms, the finisher is the Vortex Attack (ボルテックアタック, Borutekku Atakku).

These forms have yet to appear in any episode, movie, or special.

In any form that uses the Dragon Fullbottle, Build can make powerful punches and scratches with his right hand augmented by blue flames. Any form using this Fullbottle tends to be unstable, due to its immense power and close tuning to Ryuga instead of Sento.

Its power is so strong that even its Best Match configuration cannot stabilize it for long, and Build can be forced out of his transformation and get injured.

KeyDragon Form

KeyDragon Form

"Dragon! Lock! Best Match! Are you ready? (Fantasy-themed music) Fūin no fantasy star! KeyDragon! Yeah!"
―KeyDragon's transformation announcement[src]

Rider Statistics

  • Rider Height: 196 cm.
  • Rider Weight: 108 kg.

Ability Parameters:

  • Punching Power: 19.7 t. (right arm)/16.9 t. (left arm)
  • Kicking Power: 17.6 t. (right leg)/24.1 t. (left leg)
  • Maximum Jump Height: 47.4 m.
  • Maximum Running Speed: 100 m. per 5.1 sec.

KeyDragon Form (キードラゴンフォーム, Kī Doragon Fōmu) is Build's navy and gold Best Match form accessed with the Dragon and Lock Fullbottles, hence known as the Sealed Fantasy Star (封印のファンタジースター, Fūin no Fantajī Sutā). It is a Touto Best Match, and is themed after a dragon and a lock.

This form grants Build a significant parameter boost along with jumping power, albeit at a cost in running speed. Despite its tremendous power, this form also possesses a drawback of a potential overload due to the Dragon Fullbottle's strong synchronization with Ryuga.

In this Best Match Form, Build is armed with the Bind Master Key ( バインドマスターキー, Baindo Masutā Kī) on his left arm which can be used as a battering weapon due to its weight.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu): Build fires several chains from the Bind Master Key to bind the opponent in place before creating and throwing a powerful dark blue fireball, that detonates upon impact.

Appearances: Build Episode 10-11

Trial Forms
"Dragon! (Abiotic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]

As mismatched forms, the finisher is the Vortex Attack (ボルテックアタック, Borutekku Atakku).

These forms have yet to appear in any episode, movie, or special.

In any form that uses the Kaizoku Fullbottle, Build wields the Kaizoku Hassyar.

KaizokuRessya Form

KaizokuRessya Form

"Kaizoku! Densya! Best Match! Are you ready? (Pirate-themed string music) Teikoku no hangyakusha! KaizokuRessya! Yeah!"
―KaizokuRessya's transformation announcement[src]

Rider Statistics

  • Rider Height: 189 cm.
  • Rider Weight: 95.8 kg.

Ability Parameters:

  • Punching Power: 12 t. (right arm)/12.7 t. (left arm)
  • Kicking Power: 15 t. (right leg)/13.8 t. (left leg)
  • Maximum Jump Height: 39.4 m.
  • Maximum Running Speed: 100 m. per 2.5 sec.

KaizokuRessya Form (海賊レッシャフォーム, Kaizoku Ressha Fōmu, lit. PirateTrain Form)[2] is Build's azure and lime green Best Match form accessed with the Kaizoku and Densya Fullbottles, hence known as the Punctual Rebel (定刻の反逆者, Teikoku no Hangyakusha). It is a Touto Best Match, and is themed after a pirate and a train.

Being based on a train, this form is Build's fastest Best Match form, only being outpaced by Trial Form NinjyaTank by 0.2 seconds. The Kaizoku Hassyar was designed for this Best Match.

In this form, Build is armed with the Train Gauntlet (トレインガントレット, Torein Gantoretto) on his left arm for increased speed, and the Multi Sail Mantle (マルチセイルマント, Maruchi Seiru Manto) on his right shoulder for increased agility and throwing net-like capturing manoeuvres.

Using the Kaizoku Hassyar, Build can perform three different special attacks by pulling back the Build Arrow and holding it before letting go. Charging the Kaizoku Hassyar escalates its shot through three of the four tiers. While performing any of this attacks, the Kaizoku Hassyar announces Shuppatsu (出発 lit. Departure).

As a Best Match, this form has three finishers:

  • Build Driver finisher:
    • Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu):
  • Drill Crusher finisher:
    • Vortex Break (ボルテックブレイク, Borutekku Bureiku):
      • Blade Mode: Build channels the energy of a Fullbottle in his Drill Crusher and performs a powerful slash.
        • Kaizoku: The Drill Spiral Blade spins such that it creates an energy whirlpool before Build performs a double azure energy slash.
  • Kaizoku Hassyar finisher:
    • Kaizoku Densya (海賊電車): After charging the Kaizoku Hassyar by pulling back the Build Arrow and holding it until it reaches the final tier, Build fires a green and azure energy train from the Kaizoku Hassyar that not only rams into the enemy, but shoots azure energy discs as well. While performing this finisher, the Kaizoku Hassyar announces Hassha (発射 lit. Fire).
Appearances: Build Episodes 12-13, Heisei Generations FINAL: Build & Ex-Aid with Legend Riders, Build 15, 19

KaizokuGatling Form

KaizokuGatling Form

"Kaizoku! Gatling! Are you ready? (Funky music)"
―KaizokuGatling's transformation announcement[src]

Rider Statistics

  • Rider Height: 189 cm.
  • Rider Weight: 98.1 kg.

Ability Parameters:

  • Punching Power: 9.6 t. (right arm)/8 t. (left arm)
  • Kicking Power: 10.8 t. (right leg)/11 t. (left leg)
  • Maximum Jump Height: 33.1 m.
  • Maximum Running Speed: 100 m. per 6.7 sec.

KaizokuGatling Form (海賊ガトリングクフォーム, Kaizoku Gatoringu Fōmu) is Build's azure and gray Trial Form accessed through the Kaizoku and Gatling Fullbottles, themed after a pirate and a gatling gun.

In this Trial Form, Build is armed with the Hawk Gatlinger. Even though Build didn't use the Hawk Gatlinger in the debut episode, a scan shows that he does use it in this form.[3]

As a mismatched form, this form's finisher is the Vortex Attack (ボルテックアタック, Borutekku Atakku).

This form is exclusive to Kamen Rider Build Episode 16

Trial Forms
"Kaizoku! (Abiotic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]

As mismatched forms, the finisher is the Vortex Attack (ボルテックアタック, Borutekku Atakku).

These forms have yet to appear in any episode, movie, or special. KaizokuSyoubousya specifically was almost used in Build Episode 8, but Sento decided otherwise upon seeing it wasn't a Best Match.

In any form that uses the Octopus Fullbottle, Build is armed with the Twist Lash Arm (ツイストラッシュアーム, Tsuisuto Rasshu Āmu) on his right shoulder that can be used to bind his opponents.

OctopusLight Form

OctopusLight Form

"Octopus! Light! Best Match! Are you ready? (Electronic music) Inazuma technician! OctopusLight! Yeah!"
―OctopusLight's transformation announcement[src]

Rider Statistics

  • Rider Height: 193.5 cm.
  • Rider Weight: 96.5 kg.

Ability Parameters:

  • Punching Power: 4.4 t. (right arm)/4.8 t. (left arm)
  • Kicking Power: 8.6 t. (right leg)/8 t. (left leg)
  • Maximum Jump Height: 42.1 m.
  • Maximum Running Speed: 100 m. per 6.5 sec.

OctopusLight Form (オクトパスライトフォーム, Okutopasu Raito Fōmu) is Build's magenta and light yellow Best Match form accessed with the Octopus and Light Fullbottles, hence known as the Lightning Technician (稲妻テクニシャン, Inazuma Tekunishan). It is a Touto Best Match, and is themed after an octopus and a light bulb.

This is Build's weakest Best Match form in terms of ability parameters. However, his jumping power and speed is on average. As such, Build is restricted to OctopusLight's special abilities to win fights.

In this Best Match form, he is armed with the Shade Breaker (シェードブレイカーム, Shēdo Bureikā) and the BLD Light Bulb Shoulder (BLDライトバルブショルダー, BLD Raito Barubu Shorudā), which can both be used together to create lightning in order to attack his opponents.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu): Build fires an orb of jet-black ink from the head of the Twist Lash Arm that traps the enemy before snaring them with its tentacles, then using both the Shade Breaker and BLD Light Bulb Shoulder to shock the trapped enemy via a punching maneuver.

Appearances: Build Episode 13-14, 16

Trial Forms
"Octopus! (Abiotic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]

As mismatched forms, the finisher is the Vortex Attack (ボルテックアタック, Borutekku Atakku).

These forms have yet to appear in any episode, movie, or special.

In any form that uses the Phoenix Fullbottle, Build is armed with the Flame Reviver (フレイムリヴァイバー, Fureimu Rivaibā) gauntlet on his right arm for pyrokinesis and Imperial Wings (エンパイリアルウィング, Enpairiaru Uingu) on his back that grant him the ability to fly.

PhoenixRobo Form

PhoenixRobo Form

"Phoenix! Robot! Best Match! Are you ready? (Dark classical music) Fujimi no heiki! PhoenixRobo! Yeah!"
―PhoenixRobo's transformation announcement[src]

Rider Statistics

  • Rider Height: 191 cm.
  • Rider Weight: 112.3 kg.

Ability Parameters:

  • Punching Power: 15.7 t. (right arm)/28.8 t. (left arm)
  • Kicking Power: 23.4 t. (right leg)/16.8 t. (left leg)
  • Maximum Jump Height: 43.6 m.
  • Maximum Running Speed: 100 m. per 6.4 sec.

PhoenixRobo Form (フェニックスロボフォーム, Fenikkusu Robo Fōmu) is Build's vermillion and gunmetal gray Best Match form accessed with the Phoenix and Robot Fullbottles, hence known as the Immortal Weapon (不死身の兵器, Fujimi no Heiki). It is a Hokuto Best Match, and is themed after a phoenix and a robot.

In this Best Match form, Build is armed with the Demolition One (デモリションワン, Demorishon Wan) on his left hand for dismantling and crushing targets, which connected to the BLD Arsenal Shoulder (BLDアーセナルショルダー, Birudo Āsenaru Shorudā) on his left shoulder that allows him to turn dismantled objects into his personal robot troops.

Stat-wise, this Best Match is significantly stronger than all previous Best Matches, and its punching power even surpasses RabbitTank Sparkling. In this form, Build handled the Hokuto Sanbagarasu quite easy, which is something he couldn't do with RabbitTank Sparkling.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu): Build covers himself in a bird-shaped flame before ramming the enemy into the air, then flies after the enemy before repeatedly ramming into it.

Appearances: Heisei Generations FINAL: Build & Ex-Aid with Legend Riders, Build Episode 18, Raising the Hazard Level ~7 Best Matches~: First Chapter

PhoenixSoujiki Form

PhoenixSoujiki Form

"Phoenix! Soujiki! Are you ready? (Funky music)"
―PhoenixSoujiki's transformation announcement[src]

Rider Statistics

  • Rider Height: 191 cm.
  • Rider Weight: 98 kg.

Ability Parameters:

  • Punching Power: 12.6 t. (right arm)/5.7 t. (left arm)
  • Kicking Power: 9.6 t. (right leg)/13.4 t. (left leg)
  • Maximum Jump Height: 37.9 m.
  • Maximum Running Speed: 100 m. per 3.8 sec.

PhoenixSoujiki Form (フェニックス掃除機フォーム, Fenikkusu Sōjiki Fōmu) is Build's vermillion and turquoise Trial Form accessed through the Phoenix and Soujiki Fullbottles, themed after a phoenix and a vacuum cleaner.

In this Trial Form, Build is armed with the Long Range Cleaner (ロングレンジクリーナー, Rongu Renji Kurīnā) on his left arm that can suck things in with high-velocity winds, and the Trash Converter (トラッシュコンバーター, Torasshu Konbātā) on his left shoulder that stores what has been sucked in.

As a mismatched form, this form's finisher is the Vortex Attack (ボルテックアタック, Borutekku Atakku).

Appearances: Build Episodes 19, 21

Trial Forms
"Phoenix! (Abiotic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]

As mismatched forms, the finisher is the Vortex Attack (ボルテックアタック, Borutekku Atakku).

These forms have yet to appear in any episode, movie, or special.

In any form that uses the Wolf Fullbottle, Build is armed with the Wolfatal Claw (ウルフェイタルクロー, Urufeitaru Kurō) on his right arm for channeling animal instinct.

SmaphoWolf Form

SmaphoWolf Form

"Wolf! Smapho! Best Match! Are you ready? (Classic rock music) Tsunagaru ippiki ookami! SmaphoWolf! Yeah!"
―SmaphoWolf's transformation announcement[src]

Rider Statistics

  • Rider Height: 189 cm.
  • Rider Weight: 91.6 kg.

Ability Parameters:

  • Punching Power: 16.6 t. (right arm)/5.2 t. (left arm)
  • Kicking Power: 10.4 t. (right leg)/20.8 t. (left leg)
  • Maximum Jump Height: 41.6 m.
  • Maximum Running Speed: 100 m. per 5.1 sec.

SmaphoWolf Form (スマホウルフフォーム, Sumaho Urufu Fōmu) is Build's silver and blue Best Match form accessed with the Wolf and Smapho Fullbottles, hence known as the Connected Lone Wolf (繋がる一匹狼, Tsunagaru Ippiki Ōkami). It is a Hokuto Best Match, and is themed after a wolf and the Build Phone.

In this Best Match form, Build is armed with the Build Pad Shield (ビルドパッドシールド, Birudo Paddo Shīrudo) on his left arm for either defending capabilities or selecting a recommended attack enhancement. Although the Build Pad Shield cracks upon sustaining a strong attack, it can repair itself. Befitting its identical appearance to the Build Phone, the Build Pad Shield can also function in the same manner, with the exception of Bike Mode.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu): Build surrounds himself with a ring of energy smartphone icons before a black energy wolf shadow circles it, leaps out, and rams into any enemy within the ring.

Appearances: Build Episode 18

Trial Forms
"Wolf! (Abiotic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]

As mismatched forms, the finisher is the Vortex Attack (ボルテックアタック, Borutekku Atakku).

These forms have yet to appear in any episode, movie, or special.