Though skins of Sonic characters seems needs its improvement, here's skin I drew(using the resources of course): Tails skin. It has two variants: plasma pistol and rifle.
Tails guy(Tails with Doomguy's rifle) also have crouch sprites.
This wad contains 2 skins:
https://www.mediafire.com/file/zgd1ezhy ... c.wad/file