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...