Miles Prower (マイルス・パウアー Mairusu Pauā ), better known by his nickname Tails (テイルス Teirusu ) is an eight year-old two-tailed fox who is Sonic's best friend and sidekick. His name is a pun on "miles per hour". He is able to use his two tails to propel himself into the air like a helicopter for a limited time. Yasushi Yamaguchi, originally the main artist and zone designer for Sega's Sonic Team, designed Tails for an internal competition for a sidekick to Sonic. His first appearance was in Sonic 2 for the Game Gear, where he was kidnapped by Robotnik for a "hefty" ransom, and was first made playable in the Genesis version of Sonic the Hedgehog 2. Tails has appeared in almost every Sonic game since his first appearance. Tails has a very high IQ and is a great mechanic.
Tails has also starred in games without Sonic. His first solo game was Tails' Skypatrol, a puzzle-like game for the Game Gear released exclusively in Japan. This was followed by Tails Adventures later the same year, a platformer with role-playing game elements. Frequently portrayed as a sweet-natured and humble fox, Tails used to be picked on because of his twin tails, before he met Sonic.