Kitty? Such as characters like Tristana, Amumu, and Annie? Honestly I feel the game has too many, I mean a few aren't bad but I think Captain Teemo was pushing the envelope.
As far as their voice aspects go, I think Annie's should have a far more "darker" touch to it, I mean after all she is the Dark Child.
Tristana's would piss me off if I had to hear her voice every time I right clicked, other wise I don't have any serious issues with it.
Amumu's voice and dialogue both get on my nerves, but I suppose thats the theme he's going to keep given his nature.
Teemo's well, I'd like to scratch my eyes out of my skull everytime I hear his voice.