52 days until Hellboy Day - Rasputin
Grigori Yefimovich Rasputin; a real life villain, plucked straight from the pages of history. Also known as The Master, he is one of Hellboy's most dangerous enemies, and pain in the ass.
In his youth he is approached by the Baba Yaga, who gives him his purpose: to usher in the new age of man. She also stored his soul in the roots of the world tree Yggdrasil, making him immortal.
He was assassinated by a group led by Prince Felix Yusopov, but did not die. While bleeding out in the Neva River, he was contacted by the Ogdru Jahad, and recruited as their human agent to free them from their prison.
He was approached by German occultists during World War II, and used Nazi resources in attempt to jump start Armageddon. The ritual he performed summons the baby Hellboy to Earth, kicking off a chain of events that have changed the course of history.
Rasputin has appeared multiple times throughout the timeline of the Mignolaverse. He is a constant threat, both in open conflict, and looming at the edges. Despite how many times he has been defeated, we have not seen the last of The Mad Monk.
Places to see Rasputin in the Mignolaverse:
Seed of Destruction
Wake the Devil
Return of the Master
The Devil You Know
Rasputin: Voice of the Dragon