The Yaku Yaku no Mi is a Paramecia type Devil Fruit willingly turn anything s/he touches into a form of ammo for any firearm, ranging from arrows to missiles.
Strengths and WeaknessEdit
A key strength to this ability is the power to retain the original properties the ammunition had before the user made it ammo. For instance, a fire bullet will set the target on fire, while an electric bullet will cause explosions upon impact and can leave organic beings paralyzed, if not outright burnt. Air bullets will slice targets like a knife, and earthy bullets will cause massive concussive force. Different ammo have different effects. If the user trains him/herself to master this power, s/he can elevate the effectiveness of his/her ammo, or mix different properties into one, such as combining fire and air to make a massive flamethrower, or flaming air slices.
The user suffers from standard Devil Fruit weaknesses. An important weakness to remember is that the user cannot transform seawater, sea stone, or salt into ammunition. The user's powers would have been negated the moment s/he tried to do so. This also means that the user cannot use ammo that would target a Devil Fruit user's weaknesses, making for a troubling disadvantage when going up against one. However, the user can still use rain water as ammo, but it won't have any effect on Devil Fruit users.