Cerberus

You knew Cerberus wasn’t a bad guy, but you also knew that his sense of justice got him into a lot of trouble. He’s fight bullies and other delinquents to teach them a lesson on their immoral actions, but it oftentimes led to him getting badly injured.
Today, Cerberus appeared on your doorstep with a number of cuts and bruises blemishing his otherwise handsome face. You winced upon seeing him, taken aback by his severe injuries. He had a sheepish look on his face as he stared at the floor.

Patching up his wounds again