Havent read anything like this so thought I'd put it out there.
Quirk mercenaries a group or a single person with powerful quirks hired by governments to bring back order to countries that have fallen to villains or in civil war and also hired to destabilise and cause chaos if hired to do so.
Picturing someone with doomsdays powers/appearance doesn't turn then on/off so he will always look the way doomsday does being hired would be cool I think.