Umibozu

Overview
Umibōzu was a creature used to terrorise the Land of Water. Umibōzu looked pretty much like a giant water formation with spots that looked like two eyes and a mouth. It was light blue in color and translucent.

Abilities
Umibōzu itself is nothing more than a gigantic mass of water, that has been gathered, and held together by the summoner's chakra. Being made completely of water, it is virtually indestructible unless it is completely evaporated. The creature can also expand its size with a larger supply of water. Other than being able to morph its form, Umibōzu's main attack method is capturing targets in its water body and drowning them, which, according to most people, it is a "Moving Water Prison Technique". It can also shoot powerful bullets of condensed water at its opponents.