Tails as he appears in Sonic and Sega All-Stars Racing

Miles Prower (マイルス・パウアー Mairusu Pauā?), better known by his nickname, Tails (テイルス Teirusu?), is a fictional, anthropomorphic 8 year-old fox cub from the Sonic the Hedgehog series. Born with two twin-tails, hence his nickname, Tails was the subject of bullying for his abnormality during his youth. One day however, Tails met Sonic the Hedgehog and, after seeing him run like the wind, was inspired to become as cool as him. He soon after began following Sonic on his adventures and eventually became his best friend and sidekick. He is able to use his twin-tails to fly by rotating them like helicopter rotors, and is an expert mechanic and aerial pilot.
A gentle and sweet soul, Tails was initially timid and lacking in courage. After meeting Sonic, however, Tails has become more confident about himself, eventually growing up to be a more outgoing, brave and independent individual and a hero in his own right. Since meeting Sonic, Tails has looked up to him and stood by his side, helping him however he can during their adventures.
According to polls, Tails is the third most popular character of the series, behind Sonic and Shadow according to official polls.