We never learn if Mosquitor is a human with a mask, half machine, a mutant, or all of the above... I tried to sustain the mystery by giving him suit of power armor, and a retracting (again, just imagine him trying to navigate a room with that spike extruding from his face... ) stinger that can inject poison, blow gas, spray acid and maybe even shoot the barb. The stinger is hooked to a pump on his back, that stores dangerous materials he can use to make the poisons even mid battle.