So So no Mi

The Sō Sō no Mi is a Paramecia-class Devil Fruit that allows the user to change the physical state of any object at will, making them a Phase Changing Human (相変化人間, Sōhenka ningen). In the Funimation dubs and Viz translations it is called the Phase-Phase Fruit.

Usage
This fruit gives the user the ability to change the physical state of themself or any object they touch into one of the three molecular states, Solid, Liquid, or Gas, by process of Freezing, Melting, Evaporation, Condensation, Sublimation, or Crystallization, depending on what state the object is and what state it is being transformed into.

The fruit's power can also be used on living beings, but if not used correctly it could have potentially deadly side effects once they are transformed back into a solid. The being will still retain their consciousness despite being a liquid or a gas, but will not usually be able to move of their own free will.