Kame Kame no Mi

The Kame Kame no Mi is a Zoan-type Devil Fruit that allows the user to become a tortoise hybrid and full tortoise at will. It was eaten by Pekoms. Its powers were first revealed in the Fishman Island Arc, but the name of the fruit was not given until the Zou Arc.

Strengths and Weaknesses
The main strength this fruit grants is the ability to form a protective shell which is as hard as diamond. The shell can guard against things such as bullets and collapsing buildings.

Since tortoises are slow, the full form granted by this fruit is most likely slow as well, although this has never been brought up. Other than that, the user is affected by the standard Devil Fruit weaknesses.

Usage
Pekoms transforms into a tortoise when he comes under attack in order to shield himself. However, when he transforms his clothes slip off due to his body entering a shell, forcing him to fit them back on when he transforms back.