If your question is about loading a different 3d girl model and interact with it in the same way, the answer is no (not easily).es posible descargar modelos 3d externos
como d.va al juego? es decir, que se pueden follar chicas hechas en 3d por programas externos?
The problem is the game, not the engine. The game 'expects' a female model with the same bone/joint names, same grouping, blends, etc. Dropping a random Daz3d genesis 8 female in there will load, but the game can't drive it.
It "should" be possible to modify a genesis model and 'make it work', but that would require expertise and more importantly time I don't have. It may also need a custom loader to work properly.
Ultimately the answer to this lies with the developer. Many games are designed to make it easy for modders and people to bring their own asset. This isn't one of them.
Anything that is game agnostic and renders properly in unity should be loadable. One of the main limitation is C# scripting which shouldn't work (no dynamic binding).
-T-