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Miles Prower, nicknamed Tails, is a anthropomorphic fox cub who is Sonic The Hedgehog's best friend. He was born with two distinct twin-tails, hence his nickname. He is able to use his twin-tails to fly by rotating them like helicopter rotors and is a mechanic genius and aerial pilot.
He appears twice (probably his first debut) in "Sonic the Derphog: Eggventure (GET IT!?)", the first time after Sonic shoots Omochao, the second time while Sonic is falling in an attempt to commit suicide, and the third time when Eggbot 2.0 is teleported back to Sonic's World.
He also appears in "Sonic the Derphog: Showdown of the Idiots" when Sonic tells Eggman to be like him. This makes Tails go into "Senpai".
He appears in a flashback in SMG4: If Mario was in The Sonic Movie.