Kamen Rider Kuuga (Decade)

Kamen Rider Kuuga (仮面ライダークウガ, Kamen Raidā Kūga?) is the protagonist and eponymous character of the 2000 Kamen Rider Series Kamen Rider Kuuga. An alternate incarnation of the character appears in the 2009 Kamen Rider Series Kamen Rider Decade.

Yuusuke Onodera
 Yuusuke Onodera (小野寺 ユウスケ, Onodera Yuusuke?, portrayed by Ryouta Murai) has a very self-confident and gullible child-like personality, a stark contrast to the original incarnation of Kuuga, Yuusuke Godai. Yuusuke supports the police in fighting the Grongi and has feelings for Detective Ai Yashiro, as he fights to see her smile. When Yuusuke first discovered the Arcle Belt, he was warned by Decade's existence as the "devil" by Narutaki.

Fictional character biography
After killing the Grongi Me-Gyarido-Gi and Ra-Dorudo-Gu, Yuusuke answers Ai's call about another Grongi being spotted. After witnessing Decade defeat another Grongi, Ai and Yuusuke meet Tsukasa, who offers them his help as a policeman. Although Yuusuke seems to be annoyed by this, Tsukasa demonstrates his intellect and baits out two Grongi. Yuusuke recognizes Tsukasa transforming into Decade, the man who will defeat all the riders, and attacks him, but their battle is interrupted by Kick Hopper and Punch Hopper appearing due to a dimensional rift. After the battle, Tsukasa goes off to a fight a revived N-Gamio-Zeda who is terrorizing the city by converting humans into Grongi using his miasma. Yuusuke saves Ai from the miasma, but is afraid to fight because she is dying. Her words are able to convince him otherwise, and Yuusuke, along with Tsukasa, defeats Gamio. However, upon his return, Yuusuke finds that Ai has died. Yuusuke promises to go on fighting, in order to protect everyone else's smile.

But after visiting Ai's tombstone to pay his respects, Yuusuke meets Kivahla who brings him to Castle Doran in Kiva's World, where Yuusuke offers his aid to the Fangire King Wataru.

Forms
Just like the original Kamen Rider Kuuga had various forms into which he could change into for different powers and specialties, the Kuuga appearing in Decade has this same ability. The forms Yuusuke Onodera has transformed into are Mighty Form (マイティフォーム, Maiti Fōmu?), Dragon Form (ドラゴンフォーム, Doragon Fōmu?), Pegasus Form (ペガサスフォーム, Pegasasu Fōmu?), Titan Form (タイタンフォーム, Taitan Fōmu?), Growing Form (グローイングフォーム, Gurōingu Fōmu?) when defeated, and in Natsumi's dream, Ultimate Form (アルティメットフォーム, Arutimetto Fōmu?). Decade's Final Form Ride allows Kuuga to transform into the Gouram (ゴウラム, Gōramu?), giving him the ability to fly. While the first transformation required Decade's assistance, Kuuga eventually was able to transform at will into this form.