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 (character) genres other than 2D and 3D platform games. These include "Sonic Spinball", "Sonic Labyrinth" (1995), the racing games "Sonic Drift" (1994), "Sonic Drift 2" (1995), "Sonic R" (1996), "Sonic Riders" (2006), "Sonic Rivals" (2006), "Sonic Rivals 2" (2007), "" (2008), and "Sonic Free Riders" (2010), the fighting games "Sonic the Fighters" (1996) and "Sonic Battle" (2003), the "mobile game" "Sonic Jump" (2005), and the role-playing video game "" (2008). Video games such as "Dr. Robotnik's Mean Bean Machine" (1993), "Knuckles' Chaotix" (1995), "Tails' Skypatrol" (1995), "Tails Adventure" (1995), and "Shadow the Hedgehog" (2005) starred supporting characters of the "Sonic" series,