I am so tired of explaining why, but Kreia is the best character in any game, ever. That's all, please troll.
Edit: There comes a time where it becomes futile to explain your beliefs over and over again. Some things we just know to be true or false, and we cannot be too afraid to admit that we might be wrong. Maybe we are wrong, but the mere act of choice, of belief however you may explain it, are enough to propel you towards something.
I think I wrote much about Kreia before. I cannot remember, it has been years ago. But in her, I can see Avellone's greatest effort and his greatest feat. She refines the ideas from Torment further, creating a real character. A believable, larger than life figure that quests for truth, just like your character should. A real friend and mentor, and a real enemy and threat because there cannot be more than one truth. And even when you kill her, she still has won.
And that's the lesson KOTOR 2 can teach you- through thought tempered with experience you can reach a knowledge that no one can take away from you; and through that knowledge, you can finally see the stars, be you blind or deaf.
Now please do make fun of me for my shallow diatribe, but you know what? It won't change a thing. Like a stubborn Bioware fanboy, I will never be able to see that character as anything but the pinnacle of RPG characters. The only flaw KOTOR 2 had was that you weren't allowed to side with her- I know they had planned you could, but sadly that was never implemented. The best end for the game would have been Kreia and the Exile following Revan into the Outer Rim, searching further for the truth that tradition, ignorance and war has taken from the galaxy.