The Koma Koma no Mi is a Paramecia-type Devil Fruit that allows its user to spin at superhuman speeds and make objects and people spin, making its user a Spinning-Top Human (独楽人間 Koma Ningen).
Strengths and Weaknesses
The main strengh of the fruit is that the user gains the ability to spin at incredible speeds as well as spin people and objects in their vicinity, thus making themselves and everything they spin behave like spinning-tops.
Spinning increases the power of the user's melee and ranged attacks, and can also partially deflect enemy attacks and projectiles. The fruit also makes its user immune to the effect of vertigo that would result from spinning.
The user does not need direct contact with an object in order to spin it, although the time required for an object to reach its full spinning speed depends on its mass and its distance from the user.
One of the fruit's weaknesses is that the user is unable to spin if they are restrained, unless they're strong enough to make the object they're attached to spin along with them.
Another weakness is that once an object has reached its intended spinning speed, it will progressively slow down due to the effect of friction, and can be immobilized if an individual is strong enough compensate its rotating force.