So will she be part of this game?
No plans for that.
When you created Iris. Did you do her head first then body or whole figure?
Each person have their way to approach it I suppose.
But in general,
Starting out for most girls is prototype. Quick outline of body type, chest size, face, hair and so on, slapped in a model (Only way to know which models work is trial and error, I have not found any other way so far).
The vast majority will fail, only a few girls will find a model that works and move on to maturity (through endless tinkering with them). Which makes making new girls both fun and a nightmare (time spent vs. reward is often appalling)
If a creator stick to it, then girl creation will eventually switch from prototype to hybrid, mixing existing girls they have, as the preferred approach (which is were I am these days).
As for Iris? Iris is through prototype, with some tinkered hybrid added late stage to perfect a few areas.
Pure luck.
Yvette wanted a friend and willed it so.