User blog comment:WillofOP/The Fourth Kind!!/@comment-3202520-20110430201006

I'm dividing this coment in 2 topics

1st- since basically anything can be covered in the 3 original categories the only thing that rest is: the side efects so there should be a devil fruit that enabled you to create kairoseki and be the bestest swimmer ever the side efects of this fruit would be: you cant move unless youre swiming and everything will suck your power unless in touch with kairoseki or standing water; another possible 4th type would be the ability to turn into plants and create your own devil fruits

2nd topic- Devil fruits may behave similarly to fruits as in they grow from trees so they may be cross polinated with other plants and create a new specie of fruits with only really basic powers but no drawbacks if that was possible imagine this scenario

vegapunk sucesfully cross polinized a devil fruit with rice an army of marines eats a piece of rice except one vegapunk plants it and the devil fruit rice regrows and the marines gain let's say the ability to shot fire balls from their mouths

if that is possible imagine every single marine (even those with devil fruits since they wont replace the devil fruit power or kill the eater) with the ability of shoting fireballs

let's just hope this theorie is wrong

p.s. sorry for the long coment and the errors