I think I am a bit weird, my favorite characters (in order of awesomness) are:
Vanille - Lightning - Hope ._.
I don't see anything wrong about them, I really liked Vanille and the voice wasn't irritating at all. Hope was kind of a brat but he's just a kid and halfway through the game it becomes really likable.
Lightning is special, see I played Dissidia 012 first and I really despised her, but after playing XIII I must say I love lightning and her unusual name :P
3DS FC : 4339 - 3326 - 7693. Add me :) Nickname Tin