Fang the Sniper 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):
Fang the Sniper appears under the name Nack the Weasel as one of the thousands of characters to appear in this 2D action battle royale. In the game his character is of the dual Gunner-Infiltrator class.
While his weapons do not deal a particularly heavy amount of damage, he is quite fast to make up for it, leaving him as a decent hit-and-run character. He also can summon a hopping vehicle upon which to ride. He is often an early-game fielded character.