Mini Mini no Mi

The Mini Mini no Mi is a Paramecia-class Devil Fruit allows the user the become smaller than their actual size. The fruit was eaten by Blyue.

Strengths and Weaknesses
As shown by Blyue, the main strength of this Devil Fruit is for the user to shrink in size for suitable situations like evading enemy attacks and to retaliate.

This fruit doesn't seem to have any specific weaknesses, aside from the standard Devil Fruit weaknesses.

Usage
For a giant like Blyue, he is capable of shrinking down to a smaller size, making it easier for him to interact with humans and smaller creatures, as well as gain flexibility in terms of avoiding attacks.

It also seems that his clothes along with his weapon changes size to match his ability; it is shown as when his battle axe and shield grow larger when he turns into his normal form (i.e., giant).

Trivia

 * This fruit is one of the two Devil Fruits that are video game-only (the other being the Pasa Pasa no Mi).