Kai'sa has almost no discernable personality what so ever. She just growls, scowls, hisses, and acts dumb founded and confused (her joke) The only shred of character I can find is the manner that she keeps count of how many people she has killed. Some how this reminds me of Jhin, a killer keeping count, keeping score, keeping pace and rythym, ect.
Sona mute, and literally more expression through her emotes than Kai'sa. Also, I love Jinx. I love Jinx as a champion from a gameplay perspective. I love Jinx as a character from a lore perspective. I love her laugh. I had the way it's implimented or the way her other emotes work. You can't laugh emote and keep playing and have the laugh play. You have to laugh and stand still and wait for the animation to play before it triggers the audio. With Orianna at least the laugh WILL play after a time, Jinx has to actually start laughing. Same with her taunt, you can't be in lane and kiting and emote Taunt and go back to playing while your champ plays the audio line.
You have to stop, taunt, and wait for Jinx to animate and pose then begin speaking. It looks great, it's fluid, but it b r e a k s the game flow so hard. Jinx of ALL people should be able to run n' gun while talking trash. But the bullet happy destruction gasm pow lady has to stop and do forced and overly animated poses before she can emote. It's like Street Fighter III's issue of there being too many sprites/frames for every idle animation and move. So many frames that it was so telegraphed. You could tell your enemies were about to do because almost everything had either 5 frames of wind up or 5 frames of follow through. The game was gorgeous, but felt clunky.