Kimen Kimen no Mi (VooDooPirates)

The Kimen Kimen no Mi (Mask Mask Fruit) is a Paramecia-type Devil Fruit which bestows upon its consumer the ability to generate any number of masks which will take full possession of the bodies of those whom are properly wearing them. Thus making the consumer a Kitsunetsuki Ningen (Possession by a Fox Spirit Human). It was eaten by BLANK.

Advantages
The consumer of the Kimen Kimen no Mi is capable of generating a mask which will take possession of the body of whomever is properly wearing it. The personality of the mask is a result of the consumer's discretion, essentially allowing the consumer to replace the personality of any individual simply by somehow making them wear one of the masks.

It should also be noted that victims of this ability do not remember anything beyond the moment when they begun to wear mask. Thus, it's up to others to inform them of the mask's influence over their actions or even what those actions were to begin with.

Disadvantages
The masks will only be in possession of an individual's body for as long as it's being worn. The moment it is removed, the individual will regain possession of his or her body.

Trivia

 * Kimen is best translated as: Mask of a Devil, Startling Appearance, or Devil's Face