Red Hood has a dark history in the comics, as he originated as the second Robin, Jason Todd. He’s violently “killed” by the Joker in the comics, in an unprecedented move that was actually voted on by the fans at the time. Eventually Jason returns when resurrected by the Lazarus pit, and goes toe to toe with Batman before eventually re-entering the Bat-family as a crime fighter.
After The Batman hits theaters, Matt Reeves will work on a prequel series at HBO Max. You can use this link to sign up for the streaming service.