Nensho Nensho no Mi

The Nensho Nensho no Mi (燃焼燃焼の果, Nensho Nensho no Mi), referred by Seabount D. Shaw sarcastically to his opponents as the Boom Boom no Mi (ブームブームの果, Bumu Bumu no Mi), is a Paramecia-type Devil Fruit that allows the user to perform molecular combustion, thus the user is referred as a Combustion Human (燃焼人間, Nensho Ningen). It was eaten by Seabount D. Shaw.

Strength
The Nensho Nensho no Mi's primary and foremost strength is that it allows the user to perform molecular combustions within living things and non-living things by simply touching them with his hands. It is normally used for its offensive properties, as it executes molecular combustion within a designated target, thus destroying the designated target both internally and externally. It is also renowned for its supportive properties, as it is able to combust the user's legs molecularly and stop near the combustion point, thus making the user excessively fast, albeit for a brief period of time.

Weaknesses
The user suffers from the standard Devil Fruit weaknesses, thus disabling the user to perform molecular combustion in the water and succumb to the effects. Also, since the fruit is a Paramecia-type Devil Fruit, the user risks damaging themselves when they are too exhausted or have only subtle control of the Devil Fruit, often caused by the likes of the Kairoseki, thus it is a precaution that the user dons a pair of gloves. The user's means of performing molecular combustion is also limited to both of his hands. On the other hand, the lesser the physical contact with the designated target, the longer it needs to take for the user to perform molecular combustions on the designated target.

Trivia

 * The image is taken from Genthru's attack on Gon from Hunter x Hunter.
 * The idea for the Devil Fruit is based off Genthru's Nen Abilities from Hunter x Hunter.