Before you read more, I am not Anti-Sonic!
(I have always been a Sonic fan! Just so you know.)
There is a fine line between a good Sonic movie, and a DBZ rip-off. and you my freind, are an illegal immigrant big time, (if you know what I mean.) Sonic concentrates on his speed, not making his hair bigger and bigger, like you have him doing. Sonic prefers to run, not to fly around. And what is with Shadic?!? his name is SHADOW! because he is a dark version of Sonic! S-H-A-D-O-W! And that pic of "Nazo" you used, is what I'm pretty sure is the Sonic X version of Hyper-Sonic...
But other than those "minor" flaws, it was fun to watch ;)
Now go use that animation talent to good use, and go make a good Sonic movie!
(But you might want to play a few Sonic games first... Just a sugesstion.)