Mosquitus

Mosquitus (モスキータス) is a giant bug sub-boss in Mega Man X3, appearing in the second stage of Dr. Doppler's lab; but only if Vile was destroyed earlier. Mega Man X can encounter it, but if the player battles it with Zero, X can gain the Z-Saber. If the Mosquitus is defeated by Zero, the monster will catch him in a death grip and explode, leaving him severely injured. This causes Zero to be disabled for the rest of the game and pass his weapon onto X, but this will also result in the less-than-ideal-of-the-two possible endings.

Mosquitus, while holding X, can be defeated in one hit with a charged Tornado Fang.

Other Media
Mosquitus appears on the Variant Cover of Mega Man Issue 40 (Archie Comics). It later makes its official debut in Mega Man Issue 50 (Archie Comics) appearing as part of Sigma's army, and fights alongside the Deadly Six, Pteranoid, Eregion, and many Maverick minions.