I play the sims sometimes. A few years ago I realized that I only really enjoy it when I have a fully fleshed out story of every sim in the game, their relationships to each other, their personalities, etc. So I began the extensively tedious task of making a save like that. I have an excel file with hundreds of lines of text and several sheets detailing every personality trait, every relationship, their hopes and dreams, their ages so I can age them all up appropriately, and more. I also use it to make sure that I have a balanced amount of traits/goals, since the NPCs as EA made them are almost all identical with very small differences (~60% of them had the “family oriented” trait, and if they had that there was a very high likelihood they had the cheerful trait). I will work on it obsessively for a few weeks at a time then stop for months, repeat 1-3 times a year.