Vampires are blood-sucking species caused by the effects of Bram Stoker's ability, which allows him to command and control them. However, Ōchi Fukuchi seems to have also control over the vampires, allowing him to order them whenever he can. Fyodor Dostoevsky is also able to control a vampire Chuuya Nakahara through unknown means. After being bitten by an unknown aggressor, Chuya takes on a vampiric appearance.