Ricky

Ricky is a brown Squirrel which was one of the Animal friends captured by Dr. Robotnik to power his badniks. Ricky's American name is Sally Acorn, thus it is the character that Princess Sally Acorn from Sonic the Hedgehog (TV series) and Archie Comics is based on. The character, Sally Acorn (Sonic the Comic) is also based on Ricky.

Sonic X
Ricky made a number of Cameos in the cartoon series, Sonic X:
 * # 2.13 Episode 39: "Defective Detectives"
 * # 2.17 Episode 43: "Mean Machines"
 * # 2.24 Episode 50: "Running Out of Time