Dethklok (Metalocalypse)

Dethklok are the main protagonists of the Adult Swim animated program Metalocalypse. The band tends to enjoy all things brutal and violent, but they are actually the heroes of the series and they are not evil, just really stupid at times. All members are psychologically messed up and cling to each other because they have no one else, even though they hate each other's guts (on the outside). Then from Season 3 onward, they start caring and looking out for each other then acknowledge each other as true brothers in The Doomstar Requiem.

However, after going through four seasons being selfish and treating everyone around them with disrespect and having their actions being thrown in their faces in The Doomstar Requiem, they realize after defending themselves against a crowd of junkie musicians through kindness that being kind and generous is actually better than how they acted before.