Ace Ukiyo is a mysterious man who was born in the year 21 BCE as the son of a previous DGP navigator Mitsume and an unnamed previous , who acquired the ability to reincarnate from his subconscious need to find his mother. After competing in the first DGP and its subsequent tournaments, unaware of his parents' past involvements, he gained additional abilities and earned the title of Dezashin for his undefeated winning streak throughout his succeeding reincarnations across the centuries while attempting to wish for Mitsume's return so he can ask her why she granted him his initial ability. In the present, after losing his pet dog
Constantine in a car accident and graduating from high school, Ace becomes a celebrity, referred to as the , after winning the "Daybreak" DGP and later makes DGP staff members Tsumuri and Girori part of his family after winning the "Encounter" DGP, intending to use the wish he will gain from winning the "Conspiracy" DGP to further infiltrate the organization and uncover the reason behind Mitsume's disappearance. As rules are put in place to limit him, his reincarnations come to light before Ace declares war on the DGP upon discovering what the tournament organizer Suel did to his parents. Ace manages to prevent Suel from erasing the world by fully awakening the power he inherited from his mother, becoming the and recreating the world based from his memory with everyone aware of the now absent DGP's existence. Ever since acquiring the power of the Boost MarkIII Buckle, Ace prepares his death at the hands of Black Tsumuri, to revive himself as a god per Mitsume's tips, and properly destroys Suel, thereby erasing the DGP and restoring peace properly. . Utilizing the Desire Driver, Ace can transform into the
fox-themed Kamen Rider Geats. While transformed, he wears the scarf. His primary Form Raise Buckles are Magnum and Boost, which allow him to assume and respectively. He can also use the Magnum and Boost Buckles at once to assume either or . • During the "Conspiracy" DGP, Ace acquires a Fever Slot Buckle, which he can use alongside either the Magnum Buckle to assume or the Boost Buckle to assume . In both of these forms, his Geats Tail evolves into the golden . • During the "Divergence" DGP, Ace acquires
Kamen Rider Seeker's Powered Builder Buckle, which he can use either on its own to assume Powered Builder Form or alongside the Boost Buckle to assume . • During the "Lamentation" DGP, Ace acquires the Boost MarkII Buckle, which he can use either on its own to assume the evolved or alongside Ziin's Laser Raise Riser to assume the hybrid . • During the events of the Hyper Battle DVD special
Kamen Rider Geats: How Is It!? Desire Grand Prix Filled With Men, I Am Ouja!!, Ace acquires a
Kamen Rider Ryuki-themed version of the V Buckle Buckle, which allows him to assume . Ace Ukiyo is portrayed by .
Four Aces The refers to the four iterations of Ace Ukiyo in the film
Kamen Rider Geats the Movie: Four Aces and the Black Fox. As a result of Mela's machinations, Ace splits into four versions of himself, each representing one of his four key traits and thus losing the power of creation. Mela absorbs three of the clones to become Kamen Rider XGeats, forcing the remaining clone to fight against the former when his comrades are defeated. As with the original Ace, his four split clones are also portrayed by Hideyoshi Kan. The future Ace acquires the Dooms Geats Buckle, which allows him to transform into the
sky fox-themed . and joins the "Encounter" DGP in the hopes of achieving his desire of "world peace", which stems from his volunteer work at non-profit organizations and childhood dream of becoming a guardian ninja. After sustaining injuries that cause him to be eliminated during the penultimate round of the tournament, Keiwa temporarily loses his motivation until he becomes forcibly involved in the "Conspiracy" DGP, where Ace helps him regain his memories while Girori provides him with a new Desire Driver from a retiring player. Following this, Keiwa competes to fulfill his new wish of reviving dead DGP players and gains a job at his favorite
soba restaurant. Following his encounter with
Daiji Igarashi and Kagero during the events of the crossover film
Kamen Rider Geats × Revice: Movie Battle Royale, Keiwa discovers he possesses a powerful inner demon who wants to maintain world peace despite sharing his host's internal struggle. Until Ace temporarily sacrifice his own freedom to undoes Keiwa's mistaken wish, and had Daichi to make amends to make a serum to revive and free innocent casualties from the previous events, starting from Sara, allowing Keiwa to return to the righteous. After that, Keiwa decide to forgive Ace's mother and Michinaga for his misunderstanding as well Daichi. With the DGP erased at the cost of losing the memory of Ace's existence, Keiwa's wish for true world peace has been fulfilled, and he is currently studying for a job. He can also replace its left-half with another Raise Buckle to assume a variant of his Bujin Sword form, such as via the Monster Buckle or via the Boost Buckle. Following his redemption after a redeemed Daichi revived Sara, his Bujin Sword form is purified into a fully red-eyed state. • During the events of the web-exclusive special
Geats Extra: Kamen Rider Tycoon Meets Kamen Rider Shinobi, Keiwa acquires the Shinobi Buckle, which allows him to assume . Keiwa Sakurai and his inner demon are portrayed by . Due to what happened, Neon is protected by foreign bodyguards hired by her abusive mother Irumi. Neon Kurama is portrayed by . Following the tournament's conclusion, Michinaga's body ends up in Archimedel's garden, where he is resurrected due to prolonged usage of the Zombie Buckle, and escapes. He eventually wins the JGP, becomes the , and sets out to fulfill his wish as well as destroy the DGP. But his wish to destroy solely other Kamen Riders made him weak against non-Kamen Rider combatants like the Jyamato, which remained in effect after Ace restored Michinaga's humanity in the aftermath of the Desire Royale's finale. With the DGP erased at cost of losing the memory of Ace's existence, Michinaga finally moves on from Tōru's passing. • During the events of the Hyper Battle DVD special
Kamen Rider Geats: How Is It!? Desire Grand Prix Filled With Men, I Am Ouja!!, Michinaga acquires a
Kamen Rider Ouja-themed version of the V Buckle Buckle, which allows him to assume . • During the events of the V-Cinema
Kamen Rider Geats: Jyamato Awaking, Michinaga acquires the Plosion Rage Buckle, which allows him to assume his eponymous final form. Michinaga Azuma is portrayed by .
Tsumuri is a mysterious navigator for the DGP who provides the players with equipment and information while reporting to her masked superior, later revealed to be Girori. After Ace wins the "Encounter" DGP, he uses his wish to make Tsumuri his older sister, much to her dismay despite being disgusted by her co-workers attempting to sabotage Ace. Nonetheless, she gradually opens up to Ace and the other DGP Kamen Riders before manifesting abilities similar to the Creation Goddess'. But her awakened ability makes her a new target of the DGP members who are loyal to Suel, who wants her to be their replacement Creation Goddess, until Ace absorbs it from her while temporarily costing his own freedom. Alongside Kyuun and Ziin, Tsumuri is spared from being erased by Ace when he erased the DGP from existence. Tsumuri is portrayed by . ==Recurring characters==