Chomper is the mid-boss of Aqua Tunnel. It is a large green anglerfish with a red light bulb.
The Chomper will move from side to side on the shallow water it sits upon. It will attack by spewing out small globs of damaging green slime from its mouth. Its weak spot is its red light bulb, which Milla will have to attack with either a Phantom Block or a Shield Burst in order to damage it. If Milla gets too close to Chomper, it will swallow her and spit her out for some damage. After a few hits on the light bulb, Chomper will be defeated, and Milla will be carried off to a passage to the third area by a water torrent.