If you’re looking for a unique story with many changes to canon, then this isn’t the story for you. I’m only as far as Syrup Village, but so far the MC is Luffy’s vice captain, and he is the strongest in the crew by a wide margin. Although he flaunts his strength and doesn’t allow anyone to push him around, he also understands the necessity of letting Luffy and the others grow through their battles with Buggy, Kuro, etc.
This story isn’t very original, but it is pretty funny and it’s an enjoyable variation of the original storyline through the lense of a reincarnator who enjoys the strawhat crew and wants to experience the world with them.
It could never be one of my favorite fanfics, but it’s still quite a fun read and I’m loving it so far