Sonic Teammates

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 character in the Sonic the Hedgehog series of video games, comics, animated series and film released by Sega.
The name "Miles Prower" is a pun on "miles per hour", a reference to the famed speed of the Sonic the Hedgehog series. He is an eight-year old fox with two tails, hence the nickname. He is known to be Sonic's sidekick and a mechanic. He is able to use his two tails to propel himself into the air like a helicopter for a limited time. His debut was in October 16, 1992, introduced in the 8-bit version of Sonic the Hedgehog 2; the 16-bit version was released that November.
During his first appearance in Sonic the Hedgehog 2, his fur was an orange color. The color was changed to yellow-orange for Sonic Adventure, and light-yellow for Sonic Heroes. In 1993 and 1995, he starred in his own games, Tails and the Music Maker for the Pico, Tails Adventure, and Tails' Skypatrol for the Game Gear. Tails is the third most popular character of the series, behind Sonic and Shadow, according to official polls.

 Knuckles the Echidna (ナックルズ・ザ・エキドゥナ Nakkuruzu za Ekiduna) is a video game character and a hero of the Sonic the Hedgehog game series, including spin-off games and comics. His first appearance was in Sonic the Hedgehog 3, released in 1994 to introduce a new rival for Sonic. He was presented as an antagonist who was tricked by Dr. Eggman into fighting Sonic. Knuckles is a 16 year old red anthropomorphic echidna, who is both physically powerful and highly resilient. In most Sonic games, his skills include climbing ledges or walls and gliding in the air for short periods of time. He has a white crescent on his chest and four knuckles, two on each hand, which are actually sharp spikes. He is both a friend and a rival to Sonic.