Are you Ambra's friend? The game may already be full otherwise. This was to check interest in the general idea of a JoJo adventure rp, not to sell a specific adventure. I've been asking the players about their preferences on the subject, including those abilities you mentioned. Since no one has spoken up about wanting to use abilities like that, any supernatural elements beyond Stands will probably be more along the lines of magic items or phenomenons like the thing from part 5 or the things from part 7, rather than a "type of being" like a vampire or hamon user.