Secret identity superhero story but the mc is a part of an OSDD system and drives his systemmates crazy by stealing the front to do hero work whenever duty calls and constantly forgetting to put their hair back to the right part when he's done fronting.
Ps, the system has the system-specific holy grail of superpowers (shapeshifting), with the limitation of only being able to shapeshift between what the body looks like and what whoever is fronting looks like, but the mc has the ability to shapeshift to whatever he wants with only like one or two things always staying the same, and he can use that power when he's using the body's power to shapeshift into himself.
Bonus that makes it even better: a DP!Valerie-esque character is the system's best friend, knows that they're a system, but doesn't know about any of their abilities, and so is constantly trying to capture the superhero, without ever knowing that they're part of her best friend cause "he always has that dumb (insert characteristic that stays constant between forms here)! It can't be them!"