Vampire Hunter D (
Several elements in the Castlevania series seem to be an homage to Kikuchi's novels. Doris Lang's choice of a whip as her weapon, for example, could well have inspired the Belmonts' weapon of choice; the uncanny beauty of Alucard, akiness of D and Alucard's personalities, as well as his parentage and less-than-close relationship with his father are similar to D's situation.
In Castlevania: Curse of Darkness, a more humorous reference is made to Kikuchi's famous dhampir in one of Hector's forgeable armours. The Vampire Hunter "Comesafter C" was known to wear a Clown Suit, which is filled with the rage of those he killed.