User blog comment:Stone Roger/Your own Devil Fruit........../@comment-3387274-20110228215446

I'm limited by my rudimentary grasp of Japanese here but:

Ho Ho no mi: cannon fruit can transform parts of body into cannons/guns, launch anything they are holding using this, as well as swalloing things to produce bullets/projectiles from them, similar to baku baku no mi

thats pretty similar to the one luffy dream mentioned, and its not the one i'd choose, just an idea of mine.

I'd go for one of these:

logai: Toki Toki no mi (time time fruit) element of time, manifest in the form of a giant clock that is attached to the user somehow (eg like enel's drums) user can travel through time, as well as manipulating it,for example rewinding to heal injuries or change age. When they transform as with most logia, it manifests in the form of a void similar to the yami yami no mi, but different,in that it doesent suck things in. instead it can form rudimentary objects in all states of matter, as well as abosrbing things and sending them through time. anything it ever absorbs can be summoned for a short period of time, but will usually be returned after a short period