Xander.
So do I. Lilly was my best friend, she was only 17 when she died. I'd give anything to go back to the day she died, and be there and save her from Aaron. Anything. I know how you feel about Buffy, and I'm not about to brush you aside because you don't have any special powers.
I didn't have powers before either. This is all new to me. I don't know how I got here, and I won't lie and say I'm not scared to death sometimes, so yeah...I'm there with you. And if I go, I will do everything in my power to make sure that what happened to Lilly does not happen to Buffy. You can count on that.