in it's very basics Fate isn't that complicated. Sure you might need a couple of diagrams about how time works for Servants to understand FSN but otherwise it's pretty understandable. Just don't dig up old history
Another gripe I have about writing about fate is that there are like six billion different sources that can be referenced. Anime/Movie /Light novel and so on.
Personally, I wouldn't want to write a fic about a world I'm not confident I understand. Since I have only consumed very little Fate, it would take me a long time to understand what is actually going on, which I'm honestly not willing to invest.
I agree, and I did consider that, but I think the One Piece world is significantly harder to handle than the Naruto world, so I will do something else for now. As you probably already know, Bleach will be after I'm done with this. As for what I will do after Bleach? Who knows.
I know, right? She is pretty much the best thing that came from me writing this story xD Well, Yuna herself and I personally enjoy the occasional banter with Kurama as well. Those two have really come alive over the course of the story.