Sonic the Hedgehog protagonist Sonic the Hedgehog, a blue hedgehog able to run at supersonic speeds, and recurring villain Dr. Eggman, an evil scientist whose ambition is to conquer the world. Among Sonic's many allies, the most well-known include: Miles "Tails" Prower, a twin-tailed, highly intelligent yellow fox who is Sonic's sidekick and best friend; Amy Rose, a pink hedgehog who is Sonic's self-proclaimed girlfriend and a hero in her own right; Knuckles the Echidna, a coolheaded red echidna who is the guardian of the Master Emerald; Shadow the Hedgehog, an anti-heroic doppelgänger of Sonic with a dark past; and Metal Sonic, a
Sonic the Hedgehog appearance and attributes. A Flicky is one of the most prominently used animals in Eggman's experiments. This small bird's first appearance in a game predates Sonic. Flicky and its respective game were alluded to in "Sonic 3D Blast". Numerous composers have contributed music to the "Sonic the Hedgehog" series. Masato Nakamura of J-pop band Dreams Come True was responsible for the music of the first two 16-bit games. "Ys"/"Streets of Rage" composer Yuzo Koshiro composed the tunes for the first 8-bit game, except for what was retained from the 16-bit version. Sega's in-house music division, Sega Digital Studios, formerly known