Sonic the Hedgehog

Sonic the Hedgehog
Sonic is the title character and main protagonist of the Sonic the Hedgehog series and Sega's mascot. He is a fifteen-year-old anthropomorphichedgehog gifted with the ability to run at the speed of sound and beyond, hence his name, and possesses lightning fast reflexes to match.

In the RBJ Universe
In the RainbowBowserJunior universe, Sonic while still being super fast, is very laid back. Hanging out with Rainbow Dash, Link, and Champ, and being The Speed of The 20% Cooler Club. He also now has a rivalry with Tails, who is no longer his sidekick.

Trivia

 * Sonic was originally going to be smaller in the series, but RainbowBowserJunior found a larger Sonic that fits the scale.