Yuto Sakurai

"Let me say this to start: I am fairly strong!"

- Zeronos' pre-battle catchphrase Yuto Sakurai (桜井 侑斗) is Kamen Rider Zeronos (仮面ライダーゼロノス), the Secondary Rider that appears in Kamen Rider Den-O.

Yuto Sakurai
He is a man who bears the same name as Airi's fiancé who mysteriously disappeared prior to the beginning of the series, but similarities do not go any further it would seem. It is later revealed that Yuto is the very same Yuto Sakurai, only a decade younger, sharing his future self's high knowledge of astronomy. Prior to the series, Yuto Sakurai encounters his future self, the older Yuto Sakurai of 2007, who revealed to him the situation relating to the Imagin. Provided with the Zeronos arsenal and Deneb, Yuto takes the ZeroLiner forward in time to May 20, 2007.

Unlike Ryotaro, Yuto claims that protecting the flow of time is not the same thing as protecting people. He says that saving people is unnecessary if it means disrupting the flow of time even if it means sacrifices must be made to save the future. He holds a very spoiled personality, and often acts like a child when things do not go his way and putting lots of sugar in his coffee before actually tasting it, hence earning him the nickname "Boku-chan" (僕ちゃん) by Urataros. Yuto is also the kind of figure who would use dishonest methods to get the job done, but has since abandoned this way of fighting. A running gag with Yuto is his hatred for shiitake mushrooms, going as far as a comic beating to make sure Deneb does not serve or buy any.

After Yuto disappears in time (during the events of Cho Kamen Rider Den-O & Decade Neo Generations: The Onigashima Warship), an even younger version of Yuto appears known only as "Yu". Yu possesses an artifact that the Oni Brothers Goludora and Shilubara need to complete their plan. Thus Ryotaro, Kotaro and the rest of the Den-Liner crew aid him and get the artifact to the past. To protect Yu, Deneb, not knowing he is actually Yuto, asks to form a contract with him, allowing him to gain a physical form. Yu's wish for the contract is for Deneb to see his contract holder, once more. The adult Sakurai and the ZeroLiner make a cameo appearance in the end, with the former reuniting with Deneb. Yuto returns once more when his relationship with Airi begins to be threatened by the actions of the Piggies Imagin (the events of Episode Red: Zero no Star Twinkle).

When possessed by Deneb, Yuto's hair grows out past shoulder length with two locks of hair on each side of his head. On the right side, the lock is a neon green with a darker green streak within it. His personality is also overwritten by Deneb's, who is much more polite and apologizes for Yuto's actions, often by giving out Deneb Candies and acting overly friendly. This usually gets Yuto angry thus forcing Deneb out of him and comically beating him. In one occasion, he was also possessed by Urataros. Although surprised and initially annoyed, he allowed the possession to happen for a short while.

History
Prior to the series, Yuto Sakurai encounters his future self, the older Yuto Sakurai of 2007, who revealed to him the situation relating to the Imagin. Provided with the Zeronos arsenal and Deneb, Yuto takes the Zero-Liner forward in time to May 20, 2007, where he makes himself known to Ryotaro Nogami after the Wolf Imagin is destroyed. He warns Ryotaro not to look for the mysterious man in the trenchcoat, the future Yuto Sakurai that Ryotaro knows as his sister's fiancé. Yuto also reveals that he is Kamen Rider Zeronos, chiding Ryotaro's flawed ideals as Den-O yet was unhinged when Ryotaro intended to keep fighting for what he believes in. Once he meets his near-future self, who abducts Ryotaro to prepare for an event known as the Climax Scene, Yuto begins to respect the boy chosen to be Den-O.

Yuto originally has ten Zeronos Cards, the items that allow him to become Zeronos, which are in turn are tied to the memories people have of the elder Sakurai. Each time a card is used up from a battle, the memories from normal people who knew Sakurai disappear as well. It is this reason that he tries not to become Zeronos very often, only doing so if it is necessary to help Den-O. After using up his second-to-last card in an attempt to save Deneb, only to learn it was a false alarm, Yuto is reluctant to use his final card until Airi is kidnapped by Fujishiro, one of her former suitors that has been possessed by the twin Anthopper Imagin. He uses his last card as Airi begins to remember him, making Fujishiro and Airi lose all memories of the Sakurai they knew. Unable to become Zeronos, Yuto is confronted by Sakurai himself, receiving another set of Zeronos Cards despite Deneb's protests. These new cards show that the older Sakurai is displaced from time and space during each transformation, as memories of him alone cannot power the cards. As Kai arrives, Kai sees fit to eliminate Yuto Sakurai, as he believes that Sakurai is the key to the Junction Point. Kai sends the female Snail Imagin to 1993 to kill Yuto before he could meet Sakurai, removing him from time.

However, the Zeronos Cards have created a time lag, allowing Yuto to return despite not being a Singularity Point like Ryotaro. He also uses red Zeronos Cards, which Ryotaro notices. Yuto tells him that the memories of the older Sakurai are no longer enough to support Zeronos' power, and now his memories in 2007 are being used as power to transform him into Zeronos Zero Form. Eventually, Kai starts to question his agenda and realizes that Yuto and his future self have been acting as a distraction from his true target: Airi, who is tied to the Junction Point. Once Ryotaro goes into the past, Yuto is forced to battle the numerous Imagin under Kai, fighting them and the Death Imagin to protect Airi until Ryotaro returns.

When Ryotaro does return, Yuto fights alongside him using the last card Deneb gave him, which severs his ties to his future self. After the battle is over, Yuto immediately returns to the Zero-Liner to find Deneb only to find nothing but the last meal Deneb prepared for him, which ironically has shiitake in it. Yuto willingly eats the meal as Deneb surprises him. Instead of comically beating him up as normal, Yuto instead hugs Deneb, crying tears of joy. After Yuto, Hana, and Ryotaro discuss their respective futures, Yuto gives Hana a pocket watch, which signifies a possible meeting in the future. Yuto and Deneb say their goodbyes to Ryotaro as the Zero-Liner departs into the time stream.

Later, Ryotaro finds Yuto having been investigating the crime lord Seiya Kuroki undercover and discovering his ties to Negataros. Yuto and Deneb manage to maintain his guise of being a villain in the ranks until Ryotaro's partner Suzuki gets himself caught by the evil organization. Attempting to save Suzuki, he gets caught in Negataros' trap to draw out the detectives pursuing him. In the ensuing battle, Yuto is revealed to be in possession of more regular Zeronos cards.

Den-O Final Countdown
Yuto and Deneb later return to aid the Den-Liner Crew when Ryotaro is abducted by Shiro, joining the epic battle against the revived Imagin and the villains of the Phantom Train.

Cho-Den-O and Decade
After a time anomaly (attributed to Kamen Rider Decade) causes Yuto to disappear in time, an even younger version of Yuto appears in the film Cho Kamen Rider Den-O & Decade NEO Generations: The Onigashima Warship, though the entire cast only know of him as "Yu". Yu possesses an artifact that the antagonists wish to have. Thus Ryotaro, Kotaro and the rest of the Den-Liner crew aid him and get the artifact to the past. To protect Yu, Deneb, not knowing he was Yuto, asks to form a contract with him, allowing him to gain a physical form. Yu's wish for the contract is for Deneb to see his contract holder again. After Deneb is dropped back in 2009, he finds Yuto waiting for him. Both of them then return to the ZeroLiner together.

Cho Den-O Trilogy: Episode Red
Several years after final battle against Kai, Yuto tried to rescue Airi Nogami who was kidnapped by the Pig Imagin. After rescuing her, he invites Airi to observe stars together. This act made her realize that she still has lingering feelings for Yuto, even though the older one is gone.

OOO, Den-O, All Riders: Let's Go Kamen Riders
Kamen Rider Zeronos was part of a group of reinforcement riders led by Akira Date/Kamen Rider Birth to aid the primary riders in defeating the Rock Great Leader. All the Kamen Riders got on their bikes and performed the All Rider Break attack which destroyed the Great Leader.

Kamen Rider Taisen
With the DenLiner Gouka combining with, the seperated ZeroLiners participate alongside the other three DenLiner forms in the finishing attack of , Fumikiriken Brave Sanjou Slash, which is used to destroy the Generalissimo of Badan.

Despite not appearing on-screen, Zeronos' participation in the final battle is indicated by the appearance of ZeroLiner in the finishing attack.

After Shocker alters the timeline, due to being a member of the Liner Crew, Yuto and Deneb survived the alteration, and they went out to find other Riders who resisted Shocker's reign to help them find other Rider friends whose memories were altered, brainwashed, and/or captured. Deneb went into hiding, while Yuto was joined by Drive after Kotaro Minami managed to restore the Shift Car using the Heisei Rider's original memories, Go Shijima, and last but not least is none other than Kyoichiro Kuroi, who was formerly Shocker's brainwashed Rider prior to sending him from 2015 to 1973, and now on the run from Shocker. While Shinnosuke Tomari needs some time to recover himself, he, Kyoichiro and Go encounters Sakuya Tachibana, and one of the other main Royal Card Kamen Riders, whereas Mutsuki Kamijou and Hajime Aikawa became members of Shocker, and Kazuma Kenzaki is initially held as a prisoner. Apparently, the rescue was all a ruse, as Tachibana and Kenzaki are actually evil all along, but they manage to defeat the Royal Riders, as they escape again. However, they are chased by Takumi Inui, who they thought was with Shocker until he revealed he was there to assassinate Kyoichiro. As Mach handled Faiz, Zeronos and Rider 3 escapes, but only to be ambushed again by the Shocker Riders, as Rider 3 sacrificed his life to save Zeronos since they were after Rider 3, but Rider 3 was captured and brainwashed again.

Though there's no hope left, as Yuto was caught by Shocker, with a brainwashed Kyoichiro with them, a recovered Shinnosuke arrived to challenge Shocker to a race, but on one condition is to hand over Yuto as a hostage, as Shocker also held a still alive Kiriko as a hostage too, Shinnosuke accepted. While Yuto and Kiriko are watching the race, they saw Shocker doing dirty work to make Rider 3 win, yet Drive was lucky enough by being reinforced by a revived BLACK RX Kotaro, Faiz, and Mach. When Rider 3 rejects Shinnosuke's empathy of being a winner means no cheating, led to a kid who watches the race supporting the Kamen Riders, as well as leading the civilians to do so, even the kids whom Kotaro saved defects from Shocker. After Rider 3 is freed from being brainwashed and remembered Shinnosuke's empathy, accepting his loss. However, Shocker doesn't want to accept their loss as the Great Leader put Rider 3 into a vessel in the form of Rider Robo, orders all Shocker members, including the Riders to kill the Kamen Riders and their civilian resistance. After he and Kiriko are untied by the three former Shocker kids, he is reinforced by Deneb and transformed into Zeronos Zero Form, later being aided by the fully recovered Royal Ace Kamen Riders, who shortly began to recover their original memories. Rider 3's remaining consciousness revived the original Double Riders into the future, with memories of the present era, managed to recover the Shocker Riders' memories and turned them back into Kamen Riders once again. Great Leader then went too far by erasing most of the Riders' existences, until Rider 3 himself managed to break himself free from Rider Robo's vessel, rendering the Great Leader powerless and unable to utilize a time alteration. As the battle is over, with the help of the Ninningers, but they lost one ally, Mach, the timeline is about to be restored, as Kyoichiro bids his Rider allies farewell as a Rider, and may see them on the other side as a normal human. Yuto is last seen with Deneb when he noticed of Deneb's suspicion in attempt to put a shitake into Yuto's meal.

D-Video Special: Kamen Rider 4
to be added

Kamen Rider Climax Heroes
Kamen Rider Zeronos appears in all Kamen Rider Climax Heroes series video games. In the first and Kamen Rider Climax Heroes Double, his Zero form was only used as a special move and finishing move.

All Kamen Rider: Rider Generation 2
Kamen Rider Zeronos appears in All Kamen Rider: Rider Generation 2.

Kamen Rider Battride War
Kamen Rider Zeronos appears as a Second Rider in the video game Kamen Rider: Battride War. In this game, Zeronos is in his Zero Form instead of Altair Form for some reason.

Kamen Rider Battride War II
Kamen Rider Zeronos appears as a Second Rider in the video game Kamen Rider: Battride War II. In this game, Zeronos is still using his Zero Form.

Kamen Rider: Battride War Genesis
Kamen Rider Zeronos made his playable debut in Kamen Rider: Battride War Genesis, with Yuichi Nakamura reprised his role, and Zeronos now start out in his primary Altair Form, with Zero Form is finally used for his final form. Unlike Den-O, Zeronos has no limit on using his Imagin-based form Vega Form, thus making this form safer to use for the rest of gameplay. Like Hibiki Oni and Amazon, Zeronos' Altair for can link between Holding [] to other normal special moves.

Forms
Unlike Kamen Rider Den-O, Zeronos uses a card system, using Zeronos Cards to activate the transformation process. A Zeronos Card disappears after use, which limits the number of times the Zeronos transformation can be achieved as each time a card disappears. At the beginning, Zeronos had multiple forms that he could assume in battle. On his own, Yuto could become Kamen Rider Zeronos Altair Form. When the Imagin Deneb possesses him, he is able to become Kamen Rider Zeronos Vega Form. Altair and Vega Form are based on the, which is part of the myth that is the basis for the Chinese legend of , the Korean and the Japanese. A cowherd named Niu Lang/Hikoboshi is separated from his lover and the mother of his children, the fairy Zhi Nü/Orihime, by the great river (the ) as punishment for the fairy having eloped with a mortal man. Every year, the magpies take pity on the two lovers and become a bridge at to allow the two lovers to be together once again.

Kamen Rider Zeronos' ending theme is entitled "Action-ZERO".

Device

 * Zeronos Belt: Transformation Belt
 * Zeronos Card: Cards that allow Zeronos to change forms and perform attacks

Weapons

 * ZeroGasher: Personal/primary weapon for Altair and Vega forms
 * Denebick Buster: Zero Form's primary weapon

Vehicles

 * Zero-Liner: Zeronos' personal train
 * Machine ZeroHorn: Zeronos' Rider Machine

Relationship

 * Deneb: His Imagin partner. Deneb is a polar opposite of Yuto as he always want to make sure that Yuto will have friends. Because of Deneb's care about Yuto's health, he is often to give mushroom which Yuto hates most and also making Yuto annoyed for having him friends which he doesn't approve. But Yuto still think Deneb as his best friend.
 * Past Man/ Future Yuto: Despite him being his future self, Yuto has a somehow bad relationship and it is never revealed how he accepted his role as the second Kamen Rider Zeronos despite disliking it (shown during his card to become Zeronos is refilled and given again).
 * Den-Liner crew:
 * Ryotaro Nogami: At first, he mocked Ryotaro for his weakness. But later he grew to recognize him as his partner to save time from the threat of the Imagin.
 * Den-O's Taros: Yuto has no true close relationship with the Taros with the exception of Ryutaros. He is mostly annoyed with Ryutaros due to his false conception of feelings toward Airi. However, Ryutaros discarded this relationship after he realized his mistake about approaching Airi.
 * Hana: Hana is Yuto's indirect daughter because of his future self’s marriage.
 * Airi Nogami: His future wife. At first, he just came to her coffee house to drink. But later, he is somehow developed feelings toward her which were later revealed at first during his transformation into Zero Form and later in Den-O Trilogy Episode Red which showing him to be annoyed from being told to be different than his future self, showing that Airi was never once affected from Zeronos' transformation side effect.

Portrayal
Yuto Sakurai is portrayed by Yuichi Nakamura (中村 優一). As a child, he is portrayed by Ruka Sawaki (沢木 ルカ), who is actually a girl.

As Kamen Rider Zeronos, his suit actor is Makoto Ito (伊藤 慎), Yasuhiro Takeuchi (竹内 康博 Takeuchi Yasuhiro). This is currently Makoto's last role to suit act the Secondary Riders in the Heisei Era before the role went to Eitoku, starting with Decade.