...oh, right, I forgot to mention the tail. That's probably just going to be a separate sprite, simpler that way, so I didn't include it.
I'll see what I can do about the quills... they're basically just Sonic's, but with the middle one transformed into two. Should probably be lowerable, although it's the sort of thing I might easily forget on other sprites.
And oh good, his head comes from Zool? Yay, that should be much easier to get references from.