Batman: Arkham Knight

The Arkham Knight was originally Jason Todd, the second person to take the mantle of Robin after Dick Grayson and before Tim Drake. He was thought to have been killed by the Joker. Jason had always possessed an explosive temper with numerous incidents of him going too far in his actions as Robin, despite his natural talents and aptitude under Batman's guidance, with hints in his behaviour that he might one day kill instead of using restraint.