That s why I mentioned The Story Engine. It’s not an RPG. It’s purely a … storytelling device? It’s a bunch of cards and you pick a few (there are various algorithms to create different things) and then you just go wild with what you got. Here, I just picked four cards and I got : Assassin - Wants to unravel the mystery of - Archive - But it will mean risking the thing most precious to them. From there you can dig further, have another agent (like the Assassin here) with a conflicting agenda. You could generate what that precious thing / maybe person is. Etc. You could check out the quickstart (what I just used) and see how it feels.