Basically, the momentum fruit.
Type: Paramecia (3 Paramecias? Wow...I need to change)
Operation: At face level it seems like a useless fruit to anyone. The user can stop all momentum of a body, but in turn receives all damage the momentum would have done anyway. This is where, I think things get interesting. The user can transform the pain he received into momentum back again, being able to make something, or the user's own body move with a lot of momentum (dependant on the amount of momentum he stopped before releasing it). This ability would be amazing if it were eaten by a masochist (a person who likes to be hurt, or pain). So, to sum it all, the user can steal momentum from an object, translate it into pain and transfer that pain into his body. He can then use the pain to give momentum to an object or self.