Height and most genetic material would always be randomize. But... I might consider if we should have a randomize button that allows player could just randomize over and over again, to get the description that they want.
Hairstyle... I could put a way to customize that in the future. Not sure when, but this should be doable. Probably about the same time when I start adding clothing.
Body applies to all things Physical. That includes, basic lifespan, your physical stat, and some event check.
Potential atm affects how fast you cultivate, your breakthrough chance and your qi growth. In the future, it will become even more important.
I have a lot of plan for the game, but I'm still learning things. Hopefully, I could make it better in the future 😊