I have a whole neighborhood of game characters, as well as my fictional characters.
...I really need to take out the ones of me and my family, because it does creep me out to see "me" walking past the house of the cast of FFX. I made our house before I made any of the others, though.
In my Sims 1 game, I gave my sister a neighborhood, and she put all her friends plus her current boyfriend in one house, and then herself and Spike from Buffy the Vampire Slayer in another. Of course, she was like 14 at the time!