User blog comment:Stormbaron/Devil Fruits/@comment-1949750-20120223135908

"Now, there is no first come, first serve here. However, if you do make a similar Devil Fruit to a One that is made here or one from the main series; atleast TRY to make it your own. "

The only rule that I actually agreed with.

as for different abilities as well, they would actually have to make sense and be related to the primary ability such Luffy's Gear 2nd and 3rd