[@Archmage MC]
Well the first two DFs I like, and are the front-runners,  are the Ope-Ope no mi, and goro-goro no mi, for obvious reasons.
As for fruits of my own, here are a few I think might work in the rp. 


*Ryu-Ryu no mi model thunder dragon-A legendary zoan type devil fruit that allows to transform the user into either a full on dragon, or dragon-human hybrid.  It's capable of manipulating electromagnetic waves, and generating electrical blasts in its fully transformed state.

*Niji-niji no mi-A paramecia type devil fruit which allows the user, through a method I haven't quiet decided on yet, to activate one of the seven colors of the rainbow.  With each color granting a different ability

*Bijon-Bijon no mi-A paramecia type devil fruit in which the user, upon making eye contact with the enemy, can trap them in an illusion which they can freely control and any injuries or damage that the user takes while in this state, happens to their physical body.  

*Katto-katto no mi, a paramecia type devil fruit that revolves around cutting, severing, or keeping things apart(doesn't sound like much but can be op)

*Caesi-Caesi no mi, a zoan type devil fruit that allows the user to create, manipulate and transform into Caesium 

*Kakeru-Kakeru-A paramecia type devil fruit that allows the user to manipulate multiplication

*Div-Div no mi-A paramecia type devil fruit that allows the user to manipulate division

*Bureku-Bureku no mi-A paramecia fruit that allows the user to ignore an object's structural integrity, and thus cause anything the user desires to crumble to dust with a touch

*Glass-Glass no mi-A paramecia type devil fruit that allows the user to transform anything he touches, including energy and special attacks, into glass.