The one piece story I have talked about in the last update is now out. As you guys can assume, I went with the White Tiger Mythical Zoan fruit story. Fair warning, I do plan on somewhat following the canon story. I will skip over arcs I just plain don't like. An example of an arc that I don't think matters to the main story is the one with Foxy. Davy Back fights aren't even mentioned after that as far as I can remember. I may end up doing it if I can think of a way to spin it with my additional characters introduced.
As from my other stories, yes it will be a harem story in the sense that multiple female characters are connected with the MC as his crew members but not all will be pursuing the main character as each will have their own reason to join the crew, both noble and selfish. Only about 2-3 characters on his crew will originally be from One Piece. I have spent the last few weeks figuring out how to fit the non-OP characters into the story and I think I did a decent enough job at it. The best I could do that is have them somewhat connected to the Strawhats in their backstory even if they were simply residents of the same island or were victims of the same traumatic event.
Like Luffy, I do plan on making my main character a morally gray character. Some crew mates will be the voice of reason while some will join on the hair-brained schemes the MC cooks up.
Any more questions please go to One Piece: Western Wind Blows the Sail