Can you import models into Sims 3 that are from other games?

Why don't you just create your characters in create a sim. You can probably find some custom content to fit the style of dress, makeup, hair etc. and make them in create a sim. I would think that would be the easiest way to go. You can even give them the traits you think would best fit the personalities you are trying to achieve. Many people create self sims and celebrities and such.