He is the most powerful vampire in the world, greatly surpassing Count Dracula and Count Bloodeau and being show to be able to stay on sunlight and wear crosses. Besides drinking blood, he can also extract the energy of humans, animals and ghosts he bite, and turn them into zombies that obey him. Like vampires, someone bitten by a zombie will become a zombie loyal to Nosferatu. Nosferatu is actually Nobunaga Oda (明智光秀 Oda Nobunaga), but Father Karasu says that Nobunaga was a normal human. Karasu believes that the real Nobunaga was killed by Nosferatu sometime during or before the Sieges of Nagashima, and Nosferatu took over his form, becoming an evil daimyo.

(Source: Ghost Sweeper Mikami Wikia)