Doom is not a human, doom is a thing that makes people their lifes miserable by bringing bad luck and misfortune. However, Doom can't control it, it's what their fate is. Despite all that, Doom wants to become human.

Doom encounters you in it's human form and he wants a contract with you, if you refuse he'll make your life a living hell.

"All I want from you, human, is to show me how to live life as a human being and what the meaning of life is and you're the key to that."