Personally, it’s Faith from Farcry 5 for me. Uninteresting dialog that can be summed up to “I was bullied once” and that’s it. Literally every other character is so much more interesting. Jacob gives you a sequence where you run through a gulag which he then uses against you, John tries to kill you and is openly hateful towards you plus is a character you get to interact with, and Joseph is a lunatic who was right.
The way they were infuriating motivated the player and makes it satisfying when you beat them, so being annoying was absolutely the right choice. The last Pokemon games I played were on DS where your “rivals” were nice and supportive and non-annoying and they were boring and I would have fastforwarded them if I could have.