Thank you so much for all of the results!! I've already Haigakura, Akagami no Shirayukihime, Tower of God (LOOOVVVVEEE IIITTT), both Count Cain and Godchild. Actually Tower of God is exactly what i'm looking for white haired (side) protagonist and a story with a really good plot. If there are anymore please tell me!!

Monochrome Factor
http://static.zerochan.net/full/09/11/400559.jpg

Immortal Rain

I second Apothecarius Argentum, and I'm surprised that no one suggested Immortal Rain.

Ah, and if villains/antagonistic characters are also okay (saw some examples), then Full Metal Panic! Σ

http://i39.tinypic.com/9pyn3b.jpg

Also: Neji

Inuyasha
Zombie Powder
Seikon no Qwaser
Rosario to Vampire

Most of the series i was gonna recommend have already been said 😛 . Well, I guess Toaru Majutsu no Index would work. One of the main leads (Accelerator, who is very much awesome) has white hair.

Being alone is only lonely if you want it to be.
Staying in lucid delusion for an eternity.