He likes chili dogs
He can go fast
He hates Eggman 
He is frenemies with Mario
He is best friends with Tails, a 2 tailed fox that can fly.
He thinks he is cool
He has an ego
He is friends with Knuckles, a red echidna that is strong, can glide, and can climb walls.
He is frenemies with Shadow the Hedgehog, an edge lord that likes guns. (Also they're gay with eachother even though Shadow doesn't want to
An annoying pink hedgehog girl named Amy has a crush on Sonic, but Sonic doesn't like her back.