What Should I Add Into My Jojo's Bizzare Adventure Game?

I’m wondering what I should add to my game to make it more fun.
Things that I’ve already added are, a kills, and cash leaderboard, a shop gui, 3 stands. and 2 powered-up versions of two of the stands, and a small but good looking map, with a small gym, shop (the shop is just for show with an NPC with dialogue in it), and 4 NPCS. There are also 3 parts, that can give you an arrow, a Dio’s diary, or a requiem arrow. At the moment I’m wondering what I should add. If anyone has any ideas, please answer.

It would be cool if you made a bunch of stands and then assigned them to players when they join.

Originality so you don’t get your game taken down for copyright infringement.