作者原文描述：

The CK3 Human Phenotype Project is a mod aimed at making the appearences of characters more realistic and diverse by replicating various phenotypes found on the website humanphenotypes.net and assigning them to in-game cultures. This mod also ensures that hairstyles and beards are set by culture rather than ethnicity. A whopping 77 ethnicities have been added into the game, making character more varied and vierse in appearences, with people looking like their supposed geographic origins.

If you love physical anthrophology, or just want characters to have more regionally varied looks, this is the mod for you!



FAQ:
Is this mod save-game compatible?

Absolutely not. This mod edits ethnicities, which the game uses to randomly generate the looks/DNA of characters (historical and new alike). Once the character was generated - or has scripted appearance - this mod will not modify them. For this mod to truly have effect, you need to start a new game, otherwise it will only affect newly generated characters.
Yes. This mod is still a work in progress, and there is much to be refined. Stay tuned for more updates ;) Or better yet - contribute to the progress

This is an upload from loverslab but the mod is so god that it deserves some credit here as well, the mod author cant upload to steam so i thought i might as well do it.
https://www.loverslab.com/files/file/14719-ck3-human-phenotype-project/

credit to Leaf the Elf
here is the link to his loverslab profile, fair warning though loverslab can be very offensive to some people so if your offended or under the year of concent in you country just use this mod from steam


i will update this mod when a new version is relesed but intill then just have fun