Ryutaros

"Mind if I defeat you? I can't hear your answer!!"

- Ryutaros' pre-battle catchphrase

Ryutaros (リュウタロス) is the fourth Imagin that gives Ryotaro Nogami the ability to assume Kamen Rider Den-O (仮面ライダー電王)'s Gun Form.

History
Promised by Kai that he would become the Den-Liner's conductor if he kills the Singularity Point, Ryutaros enters Ryotaro's body prior to his contact with Urataros. He is eventually revealed when Issē Miura places Ryotaro under hypnosis, able to force the other Taros out of Ryotaro as he takes the human's body for a spin. Later emerging from Ryotaro's body when attracted by Naomi's coffee inside the Den-Liner, revealing his intent to kill Ryotaro, Ryutaros is revealed to have a Rider Ticket Kai gave him that allows the Imagin to remain on the train. However, having developed feelings for Airi Nogami, Ryutaros decides to not go through with it. Because he knows that Airi has loved Yuto Sakurai, Ryutaros was jealous and took faulty advice on love from Kintaros to nearly kill Yuto in a fight before Ryotaro took control. Though he forgave him for previous moments, Ryotaro gives Ryutaros a severe warning not act on his own again. Ryutaros is also credited with being the one who allowed Sieg to come upon the Den-Liner, even allowing him access to a luxurious train car.

During the events of Kamen Rider Den-O: I'm Born!, Ryutaros possesses the Ryotaro that Yuto brought for the Climax Scene. This has a negative side effect which caused Ryutaros to fade from existence were it not for Ryotaro's feelings condensing his remains into the K-Taros, restoring him to normal while allowing Ryutaros to form the chest armor of Den-O's Climax Form until his synch with Ryotaro was negated. However, Ryutaros drew up the concept design of the DenKamen Sword, his power now accessed in the Ryu-Gun Mode.

Eventually, Ryutaros meets up with Kai,who tricks him into sabotaging the Zero-Liner without knowing the consequences of the Den-Liner being taken and rendered powerless. Due to the event, Ryutaros matures and takes the new timeline's effects hard, being forced to realize that he couldn't be with Airi as she recognized him not to be her Ryotaro. After Ryotaro stands up to Kai for him, Ryutaros, like the other imagin, learns repect towards Ryotaro and is now more willing to help Ryotaro out in any way he can. Ryutaros can perform his own variation of Gun Form's finisher, Wild Shot, although it is simply a powered shot due to the lack of additional charges.

As the new year approaches, Ryutaros is saddened and confused over both Kintaros's and Urataros's decision to abandon the Den-Liner and remain in the past to fend off the Imagin army. During the final battle, he catches Ryotaro as he falls from a building at the last second, and is the first to fight the Death Imagin as Den-O Gun Form, and lent his power for the finishing blow against the Death Imagin. During the events of Climax Deka, as a member of the Den-Liner Police, Ryutaros causes an incident while searching for the "Evil Organization", arresting anyone who merely looked suspicious. He finally gets his closure with Airi when they meet face to face and he bashfully accepts the meal she made. During the events of "Final Countdown", Ryutaros assumes Gun Form (on his own) during the epic battle against the revived Imagin, determined to protect the time from being destroyed, having seen an Airi doppelganger in the time where they were, who also turns out to be an ancestor of Ryotaro and Kotaro.

Super Hero Taisen
Momotaros discovered Daiki holding up the stolen cup of Den-Liner Purine pudding that he stole from him during their last meeting. The Den-Liner rendezvoused with the where Daiki was standing with Hina Izumi and Gokaigers Joe Gibken and Don Dogoier to get back the pudding. Picking up the four passengers, the Den-Liner took them to Winter 1976 to pick up Akarenger. When the Sentai teams and the Kamen Riders battle the Shocker-Zangyack Alliance, the four Taros join the fray in their Den-O forms, fighting alongside the.

Kamen Rider Taisen
The DenLiner, piloted by Momotaros, is attacked by a sent by  of the  as they join forces with the Underground Empire Badan, resulting in the time train's destruction with Momotaros being turned into the Den-O Lockseed. However, the DenLiner returns with Momotaros when the Riders are restored. With the DenLiner Gouka combining with, the other Taros participate in their Liners with ZeroLiner in the finishing attack of , Fumikiriken Brave Sanjou Slash, which is used to destroy the Generalissimo of Badan.

Despite not appearing on-screen (his voice actor was present in the movie, but voicing other characters), Ryutaros/Den-O Gun Form's participation in the final battle is indicated by the appearance of DenLiner Ikazuchi in the finishing attack.

Kamen Rider Battride War
Ryutaros appears as Den-O Gun Form and as a navigator in the video game Kamen Rider: Battride War.

Stats

 * Height: 171cm
 * Weight: 80kg

Personality and Abilities
Ryutaros is most childish in personality with a love for drawing and animals, even affectionately referring to Airi as "sis" (お姉ちゃん) compared to Ryotaro's more formal sister (姉さん). Ryutaros also appears to enjoy break dancing, to the point to that it is incorporated into his fighting style which can cause the most collateral damage as he fires his gun aimlessly. Whenever excited, in a outside a fight, Ryutaros asks something before following with a "I can't hear your answer!" Whenever he possesses a person, Ryutaros's vessels don a hip-hop look with purple eyes with matching streak in the hair, usually wearing a cap. Though selfish and spoiled at first, Ryutaros eventually matured more as time passed with Ryotaro and the others to guide and befriend him.

In a fight, Ryutaros is armed with shotgun named the Ryuvolver (リュウボルバー). He also has the ability to control people simply by snapping his fingers, normally using to have back-up dancers, the tactic working with summoning the DenBird as well. He can control a large amount of people with this ability. Ryutaros can also freely possess most people including Singularity Points with mostly little to no effort. His power to possess others is so strong, that he can overpower Ryotaro and the other Taros, but not Sieg. It does seem that with enough effort and motivation though, Ryotaro can stop Ryutaros. Momotaros also managed to control a Ryutaros possessed Ryotaro`s hand at one point.

He usually refers to Urataros and Kintaros as "Turtle-chan" (カメちゃん) and "Bear-chan" (クマちゃん) respectively, excluding Momotaros as he's not based on an animal. He is referred to by the others as "Ryuta" (リュウタ). After this initial arrival on the Den-Liner, he is rarely seen without a pair of headphones over his head. Early promotional material stated that his form is based on the legend of Tatsu no Ko Tarō, or Taro the Dragon Boy. TV Asahi's website for Den-O states that his form is based on Ryotaro's mental image of dragons. One of the Imagin Anime shorts discusses Ryutaros's possible namesake.

Devices

 * Den-O Belt - Transformation belt
 * Rider Pass - Train pass used in transformation
 * Climax Cellphone K-Taros - A cellphone used to invoke the Climax Forms

Weapons

 * Combination Armament DenGasher - A weapon used by Den-O that can be manipulable depending on the Imagin. While Ryutaros in possession, his took the form of Gun Mode (ガンモード).
 * Ryuvolver (リュウボルバー): Shotgun used either as an Imagin or when possessing another Rider.

Vehicles

 * DenLiner Ikazuchi - Den-O Gun Form's form of the DenLiner train, composing of cars 7 and 8
 * Machine Den-Bird - Den-O's Rider Machine, used to pilot the DenLiner

Wizard Ring
This Rider Ring which bears the likeness of Imagin Ryutaros is exclusive to Kamen Rider Wizard's Wizard Ring toyline. When used by a WizarDriver wearer, it would be able to summon Ryutaros.

Portrayal
Ryutaros is voiced by Kenichi Suzumura (鈴村 健一). In both his Imagin form and as Kamen Rider Den-O (Gun Form), his suit actor is Toshihiro Ogura (おぐら としひろ).

While possessing others, he is portrayed by their respective actors while retaining his voice.
 * As R-Ryotaro, he is portrayed by Takeru Satoh (佐藤 健).
 * As R-Kotaro in Saraba Kamen Rider Den-O: Final Countdown, he is portrayed by Dori Sakurada (桜田 通).
 * As R-Tsukasa in Kamen Rider Decade episode 14, he is portrayed by Masahiro Inoue (井上 正大).
 * As R-Natsumi in Kamen Rider Decade episode 14, he is portrayed by Kanna Mori (森 カンナ).
 * As R-Ramon in Cho Kamen Rider Den-O & Decade Neo Generations: The Onigashima Warship, he is portrayed by Yuuki Ogoe (小越 勇輝).

In popular culture

 * In episode 65 of Gintama, Sougo Okita uses Ryutaros' catchphrase "Mind if I beat you? I can't hear your answer!" (倒してもいい？答えは聞いてないけど！) and his eyes flash purple while battling Kagura. Episode 89 of Gintama also features this visual gag. Kenichi Suzumura, who voices Ryutaros in Den-O, voices Okita in Gintama.