I was thinking earlier about "crazy guy" wrestling characters, and a lot of the time, there's no real reason for it other than "Look out! That boy crazy!" I'd like to see someone win the King of the Ring, but that leads to their insanity.
You could have them win the tournament, and fully embrace the pomp and ostentatiousness of being a king, with increasingly elaborate entrances, with things like red carpets being rolled out as he walks, his Queen on his arm, armoured knights who kneel before him as he walks passed them, his cape seemingly growing by the week, but then starts believing himself to be "The King of WWE" and everyone who so much as says "King" is going to face his wrath.
Then, he could have a match with someone like Braun Strowman, who stomps on the crown and smashes it, and he just snaps, he's picking up the pieces and trying to put it on his head, and every time the smashed pieces fall off his head, he cries a little harder. The next week, he's got the smashed crown stuck together with duct tape, which he has also stuck to his head, which he refuses to take off, and when the referee tries pulling it off his head, he attacks the referee so violently, you have referees, agents, security, and other wrestlers having to restrain him. as he's being dragged away by about 20 guys, he's just screaming "TREACHERY!"
Then it just leads into the "Mad King" gimmick, where there are no armoured knights, his Queen has left him and has been replaced by one of those WWE barbie dolls which he calls "Esmerelda", but in his mind, he still believes it to be the same ostentatious entrance that it always has been, his crown, in a state of complete disrepair is just collected in a plastic bag, which he still places on his head. He just descends further and further into madness, which can then be transitioned away from the "King" gimmick, into a much darker, much more cruel and evil heel.
I'd love to see that kind of story arc instead of "Hey, here comes the crazy guy!"