Yeah, Spin is out for now since the way it progresses and gets used in its part is fairly enjoyable and need not be spoiled. Hamon is fine- so far the idea seems to not have a lot of vampires going on so you'd be closer to part 3 Joseph than part 2 Joseph or Jonathan in terms of Hamon usefulness. Not sure what you mean by the other side of Hamon. Healing? Creating tension and manipulating objects?

That's an interesting Stand idea. The ability lets you speak with the dead, essentially? But not just any dead person, as they need to have a song associated with them. Did you mean more like a song that represents a close relationship you had with them, or are you saying you only want to conjure dead musicians and the like?

You guys can go ahead and keep voicing input for the next day or two, before I come out with the official story premise, character sheet, and rules.