Harry Potter: Son of Hades

Lily Potter had a night-stand with Hades, the god of the Underworld, after a discussion with her husband, James Potter. Resulting of this Harry Potter or Hadrian Evans is born, but because of the love that Lily and James had for each other James blood-adopted Harry without telling anyone that he wasn't the real father.

Harry didn't take any physical attributes from James, but people believed that he was his son because he did take some Black attributes from James' mother.