Torturing Sims is almost as much fun as tortuing Halo grunts, or Mudokons.
Me, I started with the mini-me sim, but that was not really fun. It was more fun to create a life very different from my own.
I created a Vader, and Luke skywalker family in Sims 1, and tried to see what it would be like if those two were not Jedi. I don't know if I got Anakin/Vader right or wrong, but he was a whiny depressed criminal. This was before the new trilogy.
In Sims 2 I created a crackpot team of secret agents who lived out of their base of operations. Had a few love triangles going, and tried to make sure these were the best Sims whenever they competed in the neighborhood. Had a "master of disguise" that I radically changed the appearence of on a regular basis.
I also created two different single parent families, the children of which were love birds for years. Until the girl grew up, because girls mature faster than men right? She went on to have a very successful career as a Chef on TV, and I even recorded her cooking and put the videos on her TV. I was going to have her marry her high school boyfriend, but I really liked her mother's house. I had put so much work into making that house a home, it was too ideal to give up. His place was nothing special either,...
I also had a group living in a Pirate house. That was entertaining. I made sure these were some very colorful characters as well. They really livened up the neighborhood, especially bitter old Grandpa.
This was when I wasn't trying to keep up with the Strangetown neighborhood. I haven't played Sim's 3 yet, probably never will.