Kyodai Kyodai no Mi

Introduction
The Kyodai Kyodai no Mi (the Sibling Sibling Fruit) is a Paramecia-type Devil Fruit that was eaten by the Valkyrie Brünnhilde, guardian of the Goodman Pirates, especially the captain, Mercury Goodman.

Appearance
This loving Devil Fruit looked in similar fashion to two green bananas seemingly tied together with a stem the width of a shoelace.

Usage
This fruit is used in a more supportive manner; used to heal those closest to the user (most notably, flesh and blood relations, or a close facsimile thereof) of physical ailments such as cuts, slashes, or even gunfire and cannonade.

Strengths
These benefits can turn the tide of a battle, and also help strengthen family members weakened by severe attacks.

Weaknesses
However, despite this, there are a few drawbacks to this power. For a start, it only works on said close relations (or a close facsimile thereof), and is otherwise useless. Also, it proves not as effective against internal diseases, at least not as much as physical ailments. So terminal diseases, for example, cannot simply be cured by the user.

Attacks
Not necessarily an attack, the most notable move of this fruit is the slow-yet steady healing of the "Sibling Rebond"; a move that slowly heals one blood relation at a time. Full-on healing is not impossible, but rare since it's usually just the one user healing at a time.

Trivia
This Fruit was made exclusively for Valkyrie Brünnhilde, as her character development revolves around finding loopholes in order to heal other crewmates besides Mercury.