A Peter Parker In Gotham fic but not the Tom Holland-Peter but the 20 year old Peter Parker who has both collage, work and patrol. Who shamelessly flirts with both Nightwing and Red Hood as Spider-Man but literally dies when meeting them out of costume.
The guy is used to Deadpool and is not impressed or shocked at anything the Bats do. You d!ed? Okay and? You k!lled somebody with a ballon? Sound believable. You stalked me? Okay, what do you want me to do about it?
He is tired and done with everyone’s sh!t, he will befriend your villains and your neighbours. He will stop a fight by treating to call your and your enemies parents. Does he have their numbers, yes.
Batman and the Joker fighting:
Spider-Man, a hand on his hip: Mr, do you want me to call your butler?
Batman: You don’t have his number.
Spider-Man, phone in hand: Are you sure?
Alfred: Mr Batman, get home it’s dinner
Joker: Wtf
Bruce gets split into his core personalities. I think there was a Teen Titans GO episode where this happened with Raven.
An 8 year old, sad and lonely Bruce who cries uncontrollably unless someone holds his hand
A 17 year old Bruce Wayne who dances on tables and flirts with literally the whole Justice League (who are very uncomfortable with a 17 year old version of their friend flirting with adults)
A tired dad Bruce who lectures people, drinks wine and takes care of 8 year old Bruce
The Justice League and Batfam have to figure out how to keep them calm and alive until they can put them together again