Op-Op Fruit

The Op-Op Fruit is a Paramecia fruit that allows its user to create a spherical space or "room", in which the user has complete control over the placement and orientation of the objects inside. It was eaten by Rythian.

Powers and Abilities
The Op-Op Fruit grants the user immense spatial abilities, by creating a spherical spatial barrier around him signified by a light blue aura, called the "Room", which then gives him the power to spatially manipulate anything within the territory, such as people, cannonballs, and ships, in what is described as a "surgical" manner. As such, while within the ROOM, he is capable of spatial telekinesis, as well as swap-teleportation. Through this ability, Rythian can dismember people from a distance without harming them, lift, move or displace objects of any size and switch peoples' "hearts", which is shown to effectively switch souls.

Apparently, after switching people's souls, only the user himself can reverse it, but the recipients' bodies must be present in order for him to restore them back to the original bodies. Rythian has been shown to be able to take advantage of this aspect of his Devil Fruit by modifying people's bodies in order to force them to return to him so that he can undo the modification he caused in the first place. In the case of switched "souls", Devil Fruit powers are maintained within the original physical body, while voices and other abilities, such as Haki, go along with the switched souls.He can also attach separated parts in any manner he sees fit, such as sticking someone's severed head to a barrel. People separated by this ability are not killed and can still feel their separated parts, regardless of the distance. Separated parts can be reassembled back to normal. However, while separated they can be temporarily assembled in mixed-up ways or "attached" onto other surfaces, including someone or something else's body.

Within his ROOM, Rythian can perform spatial slicing to cleanly cut through flesh and bone without actually hurting the victim. However, when the cutting power is used on a non-living object, the effect will result as a normal cut.

Weaknesses
A drawback to the fruit is that the user of the Ope Ope no Mi can only use its powers within a specific spherical area, so if the target moves outside the area, they are unaffected by its powers. It appears that Rythian has to make hand gestures to use certain attacks, though it remains unknown whether this is by necessity or by choice. Furthermore, while Rythian can control everything within a particular area, if he loses his concentration on an opponent, then they can still move freely.

A major weakness of this fruit is that usage of the fruit's abilities depletes the user's stamina. Over-usage and exerting to the range limit can even result in shortening of the lifespan.

Other than those, the Op-Op Fruit suffers from the same weaknesses as all other Devil Fruits (Inability to swim, weakness to water or Seastone, and Fishman Karate).

Rating
Scholasticus classifies this devil fruit in the "S" class.

"The Op-Op Fruit is insanely powerful in the right hands. If a user can learn and master all the abilities that come with this Fruit, they can be capable of devastating fighting abilites. Easily one of the best Paramecia fruits, and possibly even stronger than many Logia fruits due to its abilities to manipulate others."