Hantai Hantai no Mi

The Hantai Hantai no Mi (Opposite Opposite Fruit) is a Paramecia-type Devil Fruit which allows the consumer to cause people and things to become the opposite of themselves, thus making the consumer an Hantai Ningen (Opposite Human). It was eaten by Seizon.

Advantages
The consumer of the Hantai Hantai no Mi can cause people and things to become the opposite of themselves, such as a strong male, would become a weak female, or vice versa.

This power also works on Devil Fruit powers, such as if a Devil Fruit user could turn their body to a hard substance, the user could make it so that they turn their body into a soft substance.

Disadvantages
The consumer of this fruit can use their power of themselves, such as to make themselves stronger when they are weak, however the consumer can only choose what becomes opposite, however not the over all effect. Aside from this the user is susceptible to the standard Devil Fruit weaknesses.