Ah they are from second life, and Erika received a upgrade on the 0.9.7Some of your characters remind me of what you can get in a heavily modded sims 4.
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Take this Sim for example, the black gym girl from your game has a very similiar style. Most of your characters have the style, so much so that I'm 99% positive someone skilled enough could create a near 1:1 recreation in the Sims.
This isn't me being negative by the way, your models look great, I just got reminded of one of my modded sims 4 playthroughs (WickedWhims anyone?).
Look how she is now.
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But yeah, i can see what you mean.