I suppose it'd be a lot like DnD but more open, we have a storyteller or a world building and everyone is a character that gets to decide what to do. Maybe we could do murder mystery roleplay or something like that? I.E Everyone is invited to Root's Mansion (because i like root o algo) and everyone can explore the mansion, e.g "Soygoy looks around and admires Root's collection of animal paintings." and "ILoveVesna pisses all over Root's collection of valuables" or something like that.
Let it be free form, the users decide how the mansion is, how many rooms there are. Then, when the time is right, the game master will DM a random participant and tell them that they are going to be the killer, we discuss who they want to kill and how they will do it and the users have to figure out how the person died and who murdered them.
Also, we'd need to make sure that theres a way to chat and stuff without it conflicting with the thread which is why I'd be eager to program something up.