K, then replace Batman with the Flash.
Gwenpool is a more recent character who's a real world comic book nerd who was inserted into the comic book world. The thing I like about her is that she's not some fanfiction mary sue. She makes mistakes (one of which gets her friend killed) she doesn't have completely infinite knowledge of the comic book world as she actually doesn't read Deadpool, stating he's too "lolz memes" for her and-well-she's actually pretty funny.
What I'm getting at is that she could so easily have been a self insert fanfic Mary Sue who got canonized, but she's not.
Although her edge of spider-verse issue was disappointing.