I really enjoy this challenge so far! It's simple rules-wise, but has a lot of story and gameplay potential - I've been playing this for just over a sim week now and I'm just at the point where I'm needing to roll. So far my founder hasn't moved but I do get to roll lots of glittery d20s, which is always good for this dice enthusiast
I play all the Sims games, and have been developing a world within those games for almost fifteen years (the "canon" timeline started and mostly remains in Sims 2, but there have been multiple crossovers over the years) and I sometimes use different saves as alternate universes where sims who didn't have the best lives in canon get to live again. That's exactly what I've done with this one: my founder is a long-dead, fourth-generation sim, Sena "Seeri" mi-Avira. My main save of Kulo Seeri takes its name from her as she was its first headwoman, but her life was pretty uneventful. She founded the settlement because her people had been moving from place to place as a result of various "storms" (game-destroying glitches) so I thought this challenge was the ideal one to try with her!
Now, I have put my own spin on it, as I usually do. Kulo Seeri is matriarchal and the mi-Avira line is known for producing twins, so - as in the canon save - the heir must be a girl
and a twin. Thankfully I bought the fertility treatment reward while Seeri was pregnant, so she had twin girls first time. Seeri started out in Sunlit Tides and has had an eventful few days: a couple of sim days ago, just after Seeri found a boyfriend, a meteor smashed into her workplace and killed two of her friends, one of whom she got the opportunity to raise as a ghost (the other was restored by Grim). I let her go ahead with the resurrection, since the ghost didn't bring in any money to the household, and I was just going to move him out but now he wants to get romantically involved with Seeri. I might actually let him... my female sims often have multiple partners. So I've sort of turned it into a mashup of your challenge, the Amazon challenge and... possibly my own taste for trouble, if requiring that the heir be a twin girl is anything to go by. I can keep posting updates if you don't mind my rambling.
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Home of my Kulo Seeri Test of Time and a lot of worldbuilder rambling. You have been warned.