Jewelry Bonney will join the Straw Hat Pirates
Chapter 1098 shows Kuma and Jewelry Bonney dancing to the Drums of Liberation. Bonney knows about Nika thanks to Kuma.
If Bonney knew that Luffy has the Nika devil fruit, I’m pretty sure she would be more than happy to support Luffy/Nika to make Kuma’s dream come true just like Sanji wanted to find the All Blue to not only make his dream come true but also that by Zeff. This would also give the Straw Hats a chance to repay the debt they owe to Kuma.
So Jewelry Bonney joining Luffy’s crew would make sense. I think her role should be as a cabin girl. While she was a Supernova with her own crew, she hasn’t really gotten to be kid after her days with Kuma (which parallels with the rest of the Straw Hats who were forced to grow up at young ages). Joining Luffy could finally let Bonney enjoy the rest of her child years, while being protected, and still getting a role.
Plus, Cabin boys/girls main duty is assisting the ship’s cook and I just find that thought adorable. Because of her eating habits, she’d be like Luffy, but because of the fact she’s both a kid and a girl, Sanji wouldn’t be able to get mad at her.
It could work, seeing as Brook is 90, and we have all kinds of ages on the Straw Hats Crew, if we have really old members, I can totally see Oda giving us really young members as well. It would also let Luffy follow Roger more, as he had Shanks and Buggy as cabin boys.