I've seen a lot of people complaining about her design. Anywhere from Art, to gameplay, to personality. Name it, and someone has made a post extensively explaining why they don't like it.
Personally, I've been playing her on the PBE (as much as I can) and finding any and all information on her that I can. And I've gotta say, I think I'm really starting to get attached. I love her playstyle, design, color scheme, origins. Everything really. I long await till I know more about her and this symbiotic connection to a void creature.
Anyway, I'm just curious if I'm the only one who loves Kai'Sa, and I guess I'll answer anyone's questions if they have any. (I.E. why do you like her gameplay?)