Tsukasa Kadoya (Alternate)

This Kamen Rider Decade (仮面ライダーディケイド) is only a doppelganger of the original one which appeared in Kamen Rider × Kamen Rider W & Decade: Movie War 2010 Director's Cut version in Decade: Final Chapter. He only makes his appearances in Natsumi's dream.

History
In the director's cut of the film, Natsumi Hikari has a dream where she sees Tsukasa being attacked by an evil doppelgänger of himself which transforms into another version of Kamen Rider Decade Complete Form that has a series of Decade Complete Final Kamen Ride Cards instead of the Kamen Ride Cards of the Nine Worlds' Kamen Riders. This other Kamen Rider Decade, brutally punches Tsukasa and kills him, leaving him dead in the ocean while facing the entire Rider Army shortly before Natsumi wakes from her dream. The scene featuring this encounter originally appeared in the teaser for the film in the television series' finale.

Rider powers

 * Height: 199cm
 * Weight: 102kg
 * Punching Power: 12t
 * Kicking Power: 16t
 * Maximum Jump Height: 50m
 * Maximum Running Speed: 100m/4

Complete Form is the true form of Decade that is able to manipulate the power of other Riders's final forms, accessed through the K-Touch once he regains the powers of all of the Heisei Kamen Riders. Referred to as the "King of the Rider Worlds", he wears the Decade Complete KamenRide Card on his helmet, embedded in the Decade Crown, and the others's Decade Complete KamenRide Cards on his chest instead of Nine Heisei Riders.

Arsenal

 * Decadriver - Transformation belt
 * Final Kamen Terminal K-Touch - A special touchscreen cell phone which enables him to gain access to the Complete Form.
 * Ride Booker - Decade's primary weapon though, he is only skilfull in hand-to-hand combat.
 * Rider Cards - Giving access to all of his powers depending on the cards used.

Portrayal
Since his human form is never revealed, this evil Kamen Rider Decade Complete Form is portrayed by the suit actor Seiji Takaiwa (高岩 成二), who has been the suit actor for the majority of leading Kamen Riders in the Heisei era (except Kuuga and Hibiki).

Rider belt
Though the whole event is a dream, but it was unclear how did the evil doppleganger get the Decadriver but given the fact that he fights the original's civilian form, Tsukasa Kodaya, so it can be concluded that he stole Tsukasa's Decadriver and K-Touch.