This is Tails's older brother, Tony. He has a temper as well as a hot head. He likes to challenge Tails, even when Tails knows that Tony isn't in the mood. He looks like Tails except for flame on his 3 hairs, his shoes and gloves, and his googles!
Tails in Sonic the Hedgehog (aka Tails in Sonic 1), is a hack of Sonic the Hedgehog for the Sega featuring Tails as a playable character instead of Sonic.