Omega (Last Knight on Earth)

Omega is a villainous version of Bruce Wayne from the three issue mini-series Batman: Last Knight on Earth. After society fell apart due to the machinations of Lex Luthor, Bruce gave up his ethics as Batman and became the tyrannical ruler of a post-apocalyptic Earth.

History
One night in Gotham City, Batman discovers the body of a young boy in Crime Ally and learns that the victim was related to his parents murderer, Joe Chill. Batman went to confront Chill in his apartment about the child, stating DNA tests match him as the boy's father despite the fact no records showed he had a son. However, Joe just taunts Batman as he cooks on his stove and reveals that he knows about his secret identity. Running out of patience, Batman grabs Chill just as a fire begins to spread from the stove onto the walls and threatens him for answers. But Joe implies the child really was his son and the murder of Bruce's parents was not for the pearl necklace Martha Wayne wore.

Batman later meets with Commissioner Gordon to assist him with replacing a light inside the Bat Signal. Gordon knew something was troubling The Dark Knight about his latest case and convinces him to talk about it. He reluctantly informs Gordon that the body found in Crime Ally was the son of Joe Chill who was estranged from his father at birth. However, all records about his existence had been confiscated by authorities after he died at Gotham presbyterian during a botched surgery performed on him by an inebriated Thomas Wayne. After the Waynes were murdered, their estate payed to cover up the boy's death and make it seem what Joe Chill did to them was not out of revenge.