Shiro Shiro no Mi

The Shiro Shiro no Mi is a Paramecia-type Devil Fruit that allows the user to become a living fortress, making the user a Castle Human (城人間). "Shiro" (城) is a Japanese term for "castle". It was eaten by Capone Bege. Its powers were first revealed in the Sabaody Archipelago Arc, but the name of the fruit was not given until the Zou Arc.

Strengths and Weaknesses
The main strength of this fruit is that it allows the user to become a living fortress, the inside of their body holding many openings, including cannon ports, portcullis and drawbridges; deeper inside contains various rooms, ranging from stone brick rooms for combat to well-refurbished meeting halls, complete with long-table, chairs and even decorations. The user can hold even living people inside their body, by shrinking their sizes as long as they are within a vicinity within the user. When the objects and people within the user reach a certain distance away from the body, shown by a pinkish layer of an unknown aura centered on the user's location, they revert to full size. In addition, the user's castle defenses can be deployed in a circular formation to give them a full 360 degrees of protection and attack coverage, as well as the potential to conduct decisive surprise ambushes.

As long as the user does not manifest castle features on their external body, the castle features of their internal body will remain concealed and unnoticeable. This has the advantage of lulling others into a false sense of security who think they are facing a single individual in combat who appears to be lacking armaments on the surface, only for the fruit's user to reveal the militias and weaponry hidden within. If the user does not wish to engage in combat personally, they can shield themselves by releasing their subordinates and let them do the fighting for them. The user can also use their body as a storage facility for recreational purposes, as they are shown to house food and drink for subordinates and any outsiders.

The user also seems to have the ability to make a miniature version of themselves through a strange fluid as a way to communicate with those inside, however, being in their own body, the user can still just talk in order to be heard.

Should the user be inhaling smoke or any similar substances, the insides would be filled with it as well, as when Bege was smoking a cigar, the soldiers inside were suffering from cigar smokes. It seems that when the user is inside the fortress, the body becomes idle. Other than that, the user is also weak to the standard Devil Fruit weaknesses such as being unable to swim and Seastone.

Usage
You guys have already lost... in sheer military force. Capone Bege primarily uses his ability to launch a powerful surprise attack against unsuspecting adversaries. Holding his entire crew within his own body, they can fire guns or launch cannon blasts from his body, which would return to full size once leaving the boundary of Bege's ability. The troops can also rush outside of their captain's body via horses to overrun and surround their enemies. All of this results in bullets, large cannon volleys and cavalry seemingly popping out of nowhere from one man.

Bege also uses this ability to provide a place for him to have private conversations with other people. When he does this, he is able to appear from a liquid form. His larger body remains dormant, and his eyes glaze over.

Trivia

 * The Yami Yami no Mi and the Numa Numa no Mi are both similar to this fruit, as the three of them create a space inside the user's body where things can be stored.
 * In the banquet hall of Capone Bege's castle body, there are pictures of himself hung on the wall.

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