I've been thinking about nami, getting a devil fruit recently and honestly, the idea that interests me most is either a paramecia or mythical zoan witch fruit.
If this series was written by another author I might want it to be the magical girl fruit so he could get like some like dark magician girl shit, but I don't trust Oda with that right now. And to be honest, Gunko's asscheeks took me out of a lot of the fighting in the last few chapters. I'm really glad that Imu is now out of gunko
I think my ideal end of series nami configuration would be her with a witch devil fruit and her climatact somehow getting Enel's Goro Fruit