Samael Osiris

Original Character
Samael and his sister, Anastasia, didn't have a very happy childhood. Their parents were very contradictive, didn't care much and were very apathetic towards them. Never aknowledged their qualities but demonized them for their flaws.
However both parents decided to leave them with the uncle (father's side) so they could have a vacation on Paris, against the kids' will. Things started to go down as the uncle forced them to quit school to work for him on his house, making them hostages of his abuse for a long time. Samael's sanity was running low, until he heard the uncle screaming at his sister fo a small mistake she did. Before things got worse, he assaulted the man to protect his sister. The man survived the wounds and the neighbours called an ambulence, but with no signs of the kids. They already ran away.
Samael got in mind they weren't just abbandoned by their parents and society, but from God as well. So his last resort was Satanism.