Alright, Bowser x Reader (Jack Black, of course)
Tiny Bowser is just a teeny little man and Reader, who is friends with Mario and Luigi, doesn’t really get the whole “Committed various war crimes” part. She treats Bowser like a pet, in a way. Like, she’s aware that he’s a sentient being, but he’s just so little.
Anyways, something happens and the mushroom wears off and instead of going for Peach, he goes for the one person that treated him like someone other than an evil overlord. Reader.
Cue Beauty and The Beast speedrun where Reader realizes that he’s still her little man