My favorite Sonic characters are the 15 well known ones.
15. Dr. Eggman
14. Metal Sonic
13. E-123 Omega
12. Charmy
11. Espio
10. Vector
9. Cream the Rabbit
8. Rouge the Bat
7. Amy Rose
6. Blaze the Cat
5. Silver the Hedgehog
4. Knuckles the Echidna
3. Miles "Tails" Prower
2. Shadow the Hedgehog
1. Sonic the Hedgehog
I can't really come up with reasons right now but yeah these are my favorite characters. Somehow Sonic always gets number one...