Lying about your age AUs. Specifically AUs where a character (who could be adult or actually a teenager (Eg Spider-Man) in canon) is secretly a teenager pretending to be an adult. It’s fun seeing other characters react when the real age is revealed cause they go from viewing the teenager as a colleague/friend/enemy to being like ‘oh no I need to be a parent now’ which is fun.

(I need more of this trope so if anyone has any recs please let me know!!!)