So, It's been three months since I last posted here, or on Webnovel at all. Sorry about that, but I kind of just lost interest in continuing any of this. It remains to be seen whether or not this will be updated again in the future any time soon, but for now just enjoy my thoughts on this possible crossover idea between the Heaven's Feel route of Fate/stay night and JJBA, or Jojo's Bizarre Adventure.
It's already an interesting premise to combine Fate/stay night with JJBA, but what happens if you combine the Heaven's Feel route of Fate/stay night with JJBA? I personally think that makes it even more interesting.
I was thinking along the lines of introducing a post part four Jotaro into the plot of the story, but ideally you can add as many characters from JJBA as you wish to the story; just make sure they don't overshadow the characters of the Fate series.
I'd also prefer if you made the story more about the Fate side of things rather than the JJBA side of things; in other words, a plot where the JJBA characters are a supporting cast, for the most part, and not the central focus.
You can either have the JJBA characters somehow be transported to the Fate universe, or you can just combine the two worlds. I think that in this case, I'd prefer if you just combine the two worlds, but do whatever suits your story best.
In the event that you do have the characters from JJBA somehow transported tot he world of Fate, make Jotaro and Jolyne somehow get transported there just before they die in part six. (Sorry in advance if I spoiled you with that piece of information.) I think that could be a really interesting twist on things. For consistency, make any characters you introduce from JJBA also be transported right before the end of part 6. This means you'll have to account for things like Giorno, if you were to introduce him, being older than his part five self since time has passed since that part.
As for how the story goes, in general, I'm leaving that up to you, other than what I've already stated I'd prefer to happen above. You could even kill off some important characters from JJBA to heighten the tension or something, though I'd rather you not kill off Jotaro unless it's absolutely necessary for the plot to advance forward.
A good epilogue to the story would also be greatly appreciated, or even a follow up story focusing on a deeper dive into the JJBA side of things rather than the Fate side.
That will be all. Feel free to adopt the idea if you find it interesting enough to write.