Actually all this talk of 'former human latex tf' has reminded me of the time I made a nuclear type eevee evolution for a joke pokemon fangame that was very much designed to have mutated that made it encased in latex. It was hazmat suit themed so it wasn't that noticeable but I was thinking of latex tf when making him.
flat chested girlies are not nearly as represented as they should be in character design, but i think a very underrated body type to use in character design is girl whose chest is flatter than her tummy