Frog Fangire

Frog Fangire (フロッグファンガイア): Using a sword and a rifle, the Frog Fangire can fire energy warts on his shoulders. In 1986, Ōmura created the Black Star violin, attacking any he found not to have respect for his creation. He attacked Yuri Aso for that reason before being driven off by Garulu. Later, Ōmura encounters Otoya Kurenai after he stole the Black Star from Yuri, with Otoya's music soothing Ōmura to see Otoya as a worthy owner in spite of Otoya turning him down. However, Otoya has Ōmura promise to not feed on humans again, helping him escape to start his life anew with the disposing of the Black Star as the first step.

In 2008, Ōmura keeps a music player that plays Otoya's music, a calming mechanism to keep him from breaking his promise. However, while taking a break, Ōmura is driven into a frenzy after hearing a rock group and lashes on them before fighting Kiva, the both exposing themselves to the other. After Wataru saves him from Keisuke Nago, Ōmura reveals what happened in the past. However, Keisuke refused to accept it, provoking Ōmura into attacking people with Kiva almost forced to kill him. Though Ōmura regained his senses and ran off, he was found by Keisuke and mortally wounded by Ixa's Ixa Judgement. By the time Wataru arrived, Ōmura apologizes for breaking his word before he dies.