Rocky

Rocky (ロッキー) is the name given for the small walruses who are known as some of Sonic's animal friends. Rocky made his first appearance in the original Sonic the Hedgehog. Rocky's role in many games included him being captured by Dr. Eggman along with other animals to being used as energy sources for the doctor's Badniks or imprisoned inside capsules. Rocky is a rather small walrus with wide eyes, small nose and bushy mustache.

Early on in the series, Rocky was renamed Joe Sushi by Sega of America in the second draft of the Sonic Bible. It is stated in the Sonic Bible that Joe Sushi came from a large family like the other animal friends. The name Joe Sushi was used in the western markets and the other media. Rotor Walrus in the Sonic the Hedgehog comic book series published by Archie Comics and the the animated series may also be based on Rocky.

Sonic the Hedgehog Story Comic
Rocky, along with other animal friends, appears in Sonic the Hedgehog Story Comic manga. He appears in few panels in first two stories. In Sonic the Hedgehog Story Comic Volume 3' story Sonic Rampage!! he, Flicky and Pecky gets kidnapped by doctor Eggman who uses them as baits to get rid of Sonic. During the moment of truth, Eggman threatened to torture them to death if Sonic would not give up. Despite that, Sonic manages to free Rocky and others from device of Eggmobile with the speed of sound and after that he finished Eggman.

Sonic the Comic
Although never explicitly named, a character resembling Joe Sushi appeared in several early issues of Sonic the Comic from Fleetway Editions, as a member of the Emerald Hill Folk.

SatAM
Although Joe Sushi did not appear, the character of Rotor Walrus is presumably based on his appearances in the games.

Sonic X
Joe Sushi made a cameo in 2 episodes of Sonic X.
 * Episode 39:  "Defective Detectives"
 * Episode 52: "A New Start"

Quotes

 * "Can you find Tails?" - Sonic Gameworld
 * "Do you like my mustache?"- Sonic Gameworld

Trivia

 * Before SatAM and Adventures of Sonic the Hedgehog, DIC had plans for a much different Sonic cartoon which was never made, but concept art was leaked. Amongst the cast of this show was a very large, buff, angry walrus named Joe Sushi who was part of Sonic's "Freedom Team".