Tails

Tails (actual name Miles Prower) is the well-known two-tailed fox that is Sonic's most steadfast companion.

SatAM continuity
Older than in AoStH and the video games, but not as old as in Archie, Tails is still a child. However, over the series, he matures and

Archie continuity
Tails is oldest in the Archie continuity, and made mature beyond his years due to fighting Robotnik for most of his formative years. In addition to flight, in this series, he is a technical genius.

AoStH continuity
In the AoStH continuity, Tails is very young, still in daipers when Sonic comes across him.

Video games
Tails has been in a number of video games, including:
 * Sonic the Hedgehog 2 (1992)
 * Sonic the Hedgehog 3 (1994)
 * Tails Adventure (1995)
 * Tails Sky Patrol (1995)
 * Sonic Adventure (1998)
 * Sonic R (1998)
 * Sonic Adventure 2 (2001)
 * Sonic Adventure 2 Battle (2001)
 * Sonic Heroes (2003)
 * SonicN (2003)

Gender issues
In most translations of the video games, Tails is a boy. However, in the South American localisations of the video game, Tails was referred to as a girl, and is still referred to as a girl in most current games.