Turquoise, actually.. in some manga pics Chii's hair is rather white. It's a platinum blonde, anyway. I've seen Chii done with white hair and it usually looks just fine. ^^
But there's um... Well.. XD I used a white enchantment wig for Kuja from Final Fantasy IX. *points to avatar* Cut it up and sprayed it silver, though. There's also, um, Sephiroth from Final Fantasy VII.
Uh.. *thinks* Human Artemis in the Sailormoon manga has long white hair.
And also in X aside from Hinoto, there's Kakyou... *looks around room* Yeah I'm blanking on more ideas.
o.o; Himawari, the sisters Tarta and Tatra from Rayearth have RED hair. ^^;