Jet the Hawk did not originate from fanon, and the information on this page may not be entirely accurate to their canon. You may read more about this subject in the context of their canon on the following wiki(s):
Jet the Hawk is a character in the Sonic the Hedgehog (series) and the leader of the Babylon Rogues. He debuted in the NintendoGameCube title, Sonic Riders. SEGA later made a sequel called Sonic Riders: Zero Gravity and Jet was playable in that as well. He is also in Sonic Free Riders, and still a playable character. His latest appearance is in Mario and Sonic at the Olympic Winter Games. Though he is not playable, he is a rival, you go up against in Snowboard Cross. Jet is very cocky, bossy, and mean, and he's in races to win, not to have fun.