A Pern game with properly scheduled Threadfall, with a living world (NPCs that grow old and die without others needing to manage them, with life events that happen with some regularity, and so on), extensive family trees for people and dragons, areas that have things happening (even if it's code-scheduled Gathers or other events), and where population information is consistent and there are attrition rates and-
Okay, it's Pern the Excel spreadsheet mated to a database, but I really do like all of the fiddly information bits and the idea of a game that will run all of that stuff in the background while the focus of things sits on a plot that runs 6 months to a year. 1:1 time, with accelerated time for 'down time' or time skips from time to time to keep things moving.
I just really want to have a game where NPC area leadership is clear and where they don't turn into weird methuselahs because no one knows how old they are - and for those NPCs to have an actual history.
And if I could rouse myself enough to scrape the rust off of my Python skills, maybe this will be closer to a game I'd actually make.