I actually really dislike tsundere-personality types to be honest. Especially if they're supposed to be the "strong female-type" lead. I don't know why but I really find this so annoying at this point.
You can count me as the one who is definitely quite annoyed with the concept of Tsundere, especially in the harem settings. It comes off to the point that it's practically straight up abusive at points. Heck, I was waiting for a deconstruction of that type of personality where a main character flat out refused to have any association with the person like that.
"I love you."
"Really? Shoving my face 50th down to the ground definitely shows me your sweet side."
"I was too embarrassed! I was expressing my love!"
"By nearly killing me? Great way to expressed it!"
However, because of the popularity of such character archetype, it essentially became a permanent basis.
Charizard's disobedience complex. Well, sort of. In the Orange Islands arc, he does eventually obey Ash's commands considering Ash saved his life and all, but prior to that, Charizard's sheer disobedient nature ended up costing Ash several different matches at varying points prior to this.
Oh, and whichever main cast Pokemon happens to have a disobedience streak that's much more quickly resolved is a personality I hate even more; it just gives them very little reason to act in such a disobedient behavior to begin with, especially considering how quickly they begin to obey their trainer's commands. With Ash's Charizard, it took several arcs for Charizard to finally begin to listen to Ash properly.