Every character from Final Fantasy X and Final Fantasy XIII. Okay, an exaggeration when I say every. But definitely Tidus & Rikku from X. And, seriously, most characters from XIII. Even minor ones, like Hope's mom for example. In the case of XIII especially, I found the dialouge to be particularly atrocious which handicaps the voice actors before they even start.

I was going to say someone else but then I read this and completely forgot who I was going to say. So this x 1000.

This character is annoying too, who did design this??

that fricken KAY girl of SO last hope my god I cant believe i actually finished the game with her. I wonder what was going through the voice acting directors head when he choose that or the character writer

95% of characters in any given JRPG.