I have some TS2 sims in one save since I remember them the most and maybe one TS3 family I did (The Alto's since I barely remember anyone else besides the Goth's and Bachelor's.)
Downloaded the Grunt family off the Maxis gallery, since I liked how they looked and re-did the Smith & Beaker family on my own. The latter being a favorite to play with having scientists with little morale. :p
Also made sims from the Urbz game on gamecube and gameboy advance. Was some of my favorite games back in the day (even if the first game was and still is buggy even playing it on PC but that soundtrack slapped). Remembered the premade sims in it more than anything.
Bayou Boo & Crawdad Clem. XD Doubt many remember them from the GB advance game from the Urbz.
https://static.wikia.nocookie.net/sims/images/1/18/Bayouboo.png
https://static.miraheze.org/simswiki/0/06/Crawdadclem.png
https://i.imgur.com/hUCxLWj.png
https://i.imgur.com/49w6JGB.png