List of Sonic the Hedgehog characters

The Sonic the Hedgehog video game franchise began in 1991 with the video game Sonic the Hedgehog for the Sega Genesis, which pitted a blue anthropomorphic hedgehog named Sonic against a rotund male human villain named Doctor Eggman (or Doctor Ivo Robotnik). The sequel, Sonic 2, gave Sonic a fox friend named Tails.

Source: Wikipedia — List of Sonic the Hedgehog characters (CC BY-SA 4.0)