Vice is a demon born from Ikki's desire to protect others and Ikki's partner.
As a demon, Vice usually comes off as immature and mischeievous in contrast to his partner's mature and selfless personality.
Initially willing to go as far as devouring the souls of humans, Ikki's supervision of Vice keeps him grounded.
As Ikki and Vice's bond grow throughout the series, Vice dedicates himself to preserve his relationship with Ikki.
Forms a contract with Ikki at the start of the series to transform into Kamen Rider Vice.
Through Ikki's use of the Revice Driver, he and Vice transform into the duo team called Kamen Rider Revice.
As one half of Revice, Ikki assumes the form of Kamen Rider Revi, while Vice transforms into the other half, Kamen Rider Vice. Genomes are forms based on various insects, animals, and prehistoric creatures. They are designed after Legend Riders.
Revice transform and Genome Change simultaneously through Ikki's usage of the Revice Driver.
Based on a Tyrannosaurus Rex.
Accessed with the Rex Vistamp on Revi's Revice Driver.
Vice's default form. Retains this form alongside Revi (Barid Rex Genome).
As a devil, Vice shoots fire from his mouth.
Finisher(s) via Revice Driver:
Rex Stamping Finish (レックススタンピングフィニッシュ)
Remix via Revice Driver:
Revice Rex (リバイスレックス) - Combines with Revi (Rex Genome) to form a Tyrannosaurus Rex.
Based on a mammoth and Kamen Rider Den-O (Sword Form).
Accessed with the Mammoth Vistamp on Revi's Revice Driver.
Armed with Glacier Shields for defense.
Based on a pterodactyl, a hoverbike, and Kamen Rider Faiz.
Accessed with the Ptera Vistamp on Revi's Revice Driver.
Appears as a hovercraft for Revi (Ptera Genome) to ride.
Based on a lion and Kamen Rider Kuuga (Mighty Form).
Accessed with the Lion Vistamp on Revi's Revice Driver.
Performs fiery attacks, similar to Kuuga Mighty Form.
Finisher(s) via Revice Driver:
Lion Stamping Finish (ライオンスタンピングフィニッシュ)
Remix via Revice Driver:
Revice Lion (リバイスライオン) - Combines with Revi (Lion Genome) to form a lion.
Based on a jackal, a skateboard, and Kamen Rider Ex-Aid (Action Gamer Level 2).
Accessed with the Jackal Vistamp on Revi's Revice Driver.
Instead of a humanoid form, Vice is turned into a skateboard (a possible nod to Shakariki Sports).
Based on a gorilla and Kamen Rider Fourze (Base States).
Accessed with the Kong Vistamp on Revi's Revice Driver.
Armed with the massive Kong Geno Bracer for punching power. Shoots at targets, like a rocket.
Finisher(s) via Revice Driver:
Kong Stamping Finish (コングスタンピングフィニッシュ)
Remix via Revice Driver:
Revice Kong (リバイスコング) - Combines with Revi (Kong Genome) to form a gorilla.
Based on a Brachiosaurus and Kamen Rider Zi-O.
Accessed with the Brachio Vistamp on Revi's Revice Driver.
Armed with the massive Brachio Geno Bracer for punching power.
Finisher(s) via Revice Driver:
Brachio Stamping Finish (ブラキオスタンピングフィニッシュ)
Remix via Revice Driver:
Revice Brachio (リバイスブラキオ) - Combines with Revi (Brachio Genome) to form a Brachiosaurus.
Based on a Milkweed grasshopper and Kamen Rider Zero-One (Rising Hopper).
Accessed with the Neo Batta Vistamp on Revi's Revice Driver.
Performs high jumps and acrobatic movements, similar to Zero-One Rising Hopper.
Finisher(s) via Revice Driver:
Neo Batta Stamping Finish (ネオバッタスタンピングフィニッシュ) - Rider Kick, similar to Zero-One's Rising Impact.
Remix via Revice Driver:
Revice Neo Batta (リバイスネオバッタ) - Combines with Revi (Neo Batta Genome) to form a Milkweed grasshopper.
Based on an egg, ice, and Tyrannosaurus Rex.
Accessed with the Volcano and Barid Rex Vistamps on Revi's Revice Driver.
Vice's upgrade form, alongside Revi (Volcano Rex Genome).
Uses ice attacks and retains the Barid Shield from Revi (Barid Rex Genome).
Based on a Tyrannosaurus Rex and ink. Jack Revice is the super form for Kamen Rider Revice, accessed by inserting the Rolling Vistamp into the Revice Driver.
Jack Revice can be accessed either by Ikki or Vice.
Vice takes over Ikki's body after they transform into Jack Revice.
Has a power increase in combat and can move around to different positions after submerging into puddles of ink.
Uses the Rolling Vistamp as the default weapon.
Based on a Tyrannosaurus Rex and lightning. Kamen Rider Revice is Revi and Vice's combined super form and a step-up to Jack Revice.
Accessed by inserting the Thunder Gale Vistamp into the Revice Driver.
This form restores Ikki and Vice back to their normal places after dealing with the effects of transforming into Jack Revice.
Kamen Rider Revice uses lightning and wind-powered attacks and moves at high speed while in battle.
Combining Thunder Gale with another Vistamp allows Revice to execute strengthened attacks.
Additionally, they can separate Phase 3 Deadmans from their hosts.
Based on a Tyrannosaurus Rex.
Kamen Rider Vice's final form, accessed by inserting one-half of the Giffard Rex Vistamp into the Revice Driver.
Along with Ultimate Revi, the two Riders go by the moniker of Ultimate Revice. Ultimate Revice may be a subtle reference to the DoubleRiders from Kamen Rider (1971).
Can land strong hits on enemies and perform very high jumps, resulting in quick depletions of Giff Juniors.
Combining with Ultimate Revi's other half of the Giffard Rex Vistamp, Ultimate Revice can create duplicates of themselves.
Revice Driver's Remix function turns Ultimate Vice into a ball-like form that Ultimate Revi kicks to strike the enemy.
Finisher is called Vice Giffard Finish, where Ultimate Vice performs an intensive, spinning Rider Kick in the air with Ultimate Revi.