Here are the bunch of naruto/one piece crossover challenges
In all crossovers unless i say other otherwise luffy will have all his powers and skills he had after the 2 year timeskip. and if you so wish if luffy is in the naruto world can give hive chakra just not too powerfull considering his current power to begin with.
1. luffy is the pirate king and is married to nami and have a girl named mika(around naruto's age) and they chose to settle down in konoha in the time when naruto was painting on the hokages faces. basically about luffy's daughter growing up as a ninja along with naruto and the rest of team 7(following the plotline of the anime only with addition of the monkey family). luffy i guess helps the village with missions as stuff for a living like a jonin like kakashi you can even make luffy a co team leader of team 7. mika can have a devil fruit but not too powerfull,plus she will be training as a ninja with the rest so she has chakra. The rest of the strawhats have settled down after completing their dreams but if you want them to be in the story i don't mind.
2. luffy is an uchiha he just doesn't know it yet so when the strawhats land at konoha sasuke gets suspicous and wonders if he is really the only uchiha left besides his brother. you can decide how sasuke finds out etc and for luffy using or learning the sharingan well thats up to you but make it so luffy doesn't have it too quickly or anything.(konoha before timeskip)
so far these are the only too for now but i try to think of more and stuff so plz private message me if have questions or if you want to take on one of the stories. if you have any ideas i don't mind you sharing with me but i most likely will just add them on the challenge fics so you might as well as do those ideas yourself.