A friend of mine was working on an automated story telling system for Nethack as his Masters (Linguistics & CS/AI, IIRC) thesis. It was never really completed,

A friend of mine was working on an automated story telling system for Nethack as his Masters (Linguistics & CS/AI, IIRC) thesis. It was never really completed, but there was some interesting work in applying goal-based planning AI in reverse to generate possible long-term motivations for individual actions. I don't think it's available online though, sadly.