King (Kiva)

'King (キング, Kingu) is The Checkmate Four's original is referred to as the Dark Kiva''' (闇のキバ, Yami no Kiba), the lord of all Fangires and the original Kiva who was a threat to humanity in his time. Despite being married to the previous Queen of the Checkmate Four, Maya, he has no actual love for her as her purpose to him was the birth of his son, Taiga Nobori.

Fictional character biography
When the King returns from afar to check up on his mate and son, he is angered to learn from Bishop that Maya has been meeting with Otoya, a human who has been using the Ixa System to slaughter their race, sparing her as the action of killing her would prove that he loved her and letting her be the one to kill the human. He later goes after Jiro to finish what the Rook started: the extermination of the Wolfen Race, along with putting an end to the last of Merman and Franken races as well. However, he eventually offers the three a chance to avoid extermination, provided they kill Otoya for him.

The three are unable to do it, choosing to flee town instead. Riki and Ramon were unable to escape the King, who seals them into the Dogga Hammer and the Basshaa Magnum respectively so they can serve as decorations within Castle Doran. He is heartbroken and enraged when Maya reciprocates Otoya's love for her, preparing to kill them when Jiro intervenes and finds himself sealed into the Garulu Saber. After capturing Otoya, the King forcibly takes him to Castle Doran, using his life energy to feed the monstrous beast. As a final request, the King allows Otoya to play his violin one last time before he died, but Maya interferes and fights her consort while Yuri escapes with Otoya.

Maya is ultimately stripped of her title and Fangire powers as a result, with the King later forcing her to never see Otoya again by using Taiga's well-being to enforce it. When Kivat-bat the 2nd witnesses Wataru Kurenai, Otoya's son from 22 years into the future, transform into Kiva, both this and his partner's cruel methods ultimately lead to the King losing Kivat the 2nd to Otoya, resulting in the final confrontation between the two. After the battle, the King is ultimately killed indirectly by the hand of his own son when he tried to kill him and Maya. However, the Bat Fangire is resurrected by Bishop to kill both Taiga and Wataru, only for the revived King to be killed by them.