That guy is so lucky to have met Diz. She was able to instinctively understand him and both goes along with and helps him hide his weaponized chuunibyou (although I also sometimes enjoy stories where people bsod every time the protagonist casually destroys common sense; I think what separates them the most for me is whether or not the protagonist is aware that what they do is outrageous; in that sense all phrases banned here stand for the bad side of the overpowered protagonist trope, where it's an annoying misunderstanding that's drawn out forever). No need for a harem when you have such a perfect counterpart for the protagonist.