Mizu Luffy

Mizu Luffy is one of several forms Luffy takes through the series. He has used his Mizu Luffy form twice (although the second one was unnamed, attackless and anime only).

Form History
During his second fight with Sir Crocodile, Luffy had brought a barrel of water to combat Crocodile's Devil Fruit powers. When he found out Crocodile might try to break the barrel and take away Luffy's advantage, Luffy decided to drink all the water in the barrel. The result was Mizu Luffy (Water Luffy).

In this form, Luffy can now spit out water pistols at Crocodile, which would make him vulnerable to physical attacks. This form also saved his life as well; before Crocodile completely dried Luffy up, Luffy spat 3 Water Pistols into the air. Although they were probably meant for Crocodile, they 3 Water Pistols landed on Luffy, re-hydrating him. On a side note, Luffy almost sprung a leak where Crocodile had stabbed him, but it stopped momentarily.

Attacks

 * Mizu Mizu no Pistol - Luffy spits out a blob of water at his opponent. The blob of water moves as fast as a bullet would from a pistol.