Kamen Rider Kiva (Rider)

Kamen Rider Kiva (仮面ライダーキバ) is the primary protagonist and eponymous character of the 2008 Kamen Rider Series, Kamen Rider Kiva. Kiva is a title passed down through generations in the Royal Fangire family from parent to child. It may refer to any the following characters.

Novel
In the novel reimagination of the TV series, Kiva is Wataru's Fangire form. With that, Kivat, Basshaa and Dogga do not exist in this story. Meanwhile, Jiro/Garulu, who is in turn, a Fangire Hunter. And Nago never befriends Wataru, who ends up as the final villain. He died after his Rider Kick collides with Wataru's kick.

Etymology
"Kiva" is an abbreviation for "KING OF VAMPIRE", which plays in Kiva's connections to the Fangire King. The Japanese name also comes from a reading for the word "fang" (牙).

Forms
Kiva has multiple forms that provide him with different weapons and abilities. Kiva's motif is that of a vampire, with his final attacks inherited from Maya. However, unlike the Fangire King, Wataru's nature as a human-fangire hybrid leaves him unable to fully utilize Kiva's full power with the Catena (カテナ) Chains serving as restraints. His fighting power may also slightly depend on Kivat-bat the 3rd`s condition as shown when Kivat caught a cold. Wataru later on becomes able to use the full power of Kiva through Tatsulot and sheer willpower. Additionally, Zanbat serves as a restraint to keep the power of the Zanvat Sword from taking complete control of Wataru. It seems that his body later on becomes more adept to the power of Kiva as the series progresses to the point where Taiga hinted that he can now even use Dark Kiva itself. If this were the case, this may mean Wataru can currently transform into DoGaBaKi Form (as well as presumably DoGaBaKi Emperor Form) without suffering the drawbacks of it`s amount of demonic power.

Rider Cards
Several Rider Cards allow Tsukasa Kadoya/Kamen Rider Decade to access the power of Kiva.
 * Kamen Ride Card: Regained when Tsukasa acknowledges Wataru as the Fangires' King. Decade uses the card to assume Kiva's Kiva Form. A Kamen Ride: Kiva card is also possessed by Diend, which he uses to summon Kiva. First used in the World of Faiz to battle Kamen Rider Ryuga.