While browsing Newgrounds, I've found an excellent series made by Chakra X. It's about Nazo, the fan-name given to the unknown hedgehog who appeared in Sonic X. It's widly believed that Nazo is actually Silver from the upcoming Sonic '06, but this was all made before Silver was revealed.

It's a cool series, after watching part one, make sure to check teh author's other works to see the part 2. :3

Nazo pt 1