Rotor the Walrus

Rotor the Walrus, also known as Rotor Walrus, is a member of the Freedom Fighters and a friend and teammate of Sonic the Hedgehog. He and his teammates are long-standing enemies of Dr. Eggman, but also became involved in the conflict against Sigma's alliance of villains during Worlds Unite.

Before and After Worlds Collide
Rotor was one of the inventors amongst the Freedom Fighters-along with Miles "Tails" Prower-but stepped up into a leadership role after the team collapsed. He became the leader of the new Team Freedom, which saw him fighting such threats as Tails Doll alongside Cream the Rabbit, Big the Cat, Nicole, and others.

After his universe was hit by the Genesis Wave that also affected Earth 20XX and later the Super Genesis Wave, Rotor found himself in a new reality. Here he was once again a member of the Freedom Fighters, and designed their massive mobile base, the Sky Patrol.

Background Information

 * Rotor first appeared in the Sonic the Hedgehog animated series.