Hellboy 3: 10 Comic Plots That Should Be Used
3. Sarah Hughes And Azzael
One of the big themes of Del Toro's first Hellboy movie concerned nature versus nurture and the clash between Rasputin and Professor Bruttenholm for the role of Hellboy's "father".
The demon spawn hero has a real father, though, and it is neither of them. Assuming that a third movie, if it got made, would really address why Hellboy was brought into this world and what he is destined to do, connecting back to the origin story at the start of the first part, his biological parentage would be a sensible place to start.
In the comics, Hellboy is the child of the demon Azzael and Sarah Hughes, a sixteenth century witch. In the early comic The Chained Coffin, Hellboy travels to England to find out from a psychic that the Nazi experiment that brought him into this world was not his real birth. The psychic tells him about Sarah, a witch who renounced her ways on her death bed, but was still dragged to hell by Azzael where he conceived a child with her. Rasputin simply served to bring that child into the world - he's essentially Hellboy's midwife.
If the movie did include the previously mentioned arc about the world's witches, the plot could kick off with Hellboy living in cosy, family centred retirement in Britain (not much of a stretch given the leads were last seen walking off into the distance on the coast of Ireland, discussing their impending expanding family), but being found by witches and informed of his ancestry as they ask him to be their new leader.