How to make your character customizable

I’ve been looking at stories where you can basically change the look of someone. It’s usually in the start where you can edit the face, hair, skin tones and stuff, and also change the name.
I’m wondering how to make the code for this to happen. How can you change the name and looks of someone?

Thanks in advance.

Here’s the thread for CC

And, the guide for name changing.

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