Use the created character as an NPC or Player. You just need to drop one prefab to manage the character loading process. From premade to totally random character, you keep full control of the result just by selecting options in the editor.
Watch Tutorial 02.

Two very simple functions can be used for Players and NPC:
SavePlayer():
Only needed if you decide to save a player after the “Customization Scene”. ChangeAvatarItem():
Change item at runtime on the avatar like clothes, hair, tatoos…(ex: useful for inventory)
Watch Tutorial 03.

Check out the details from the Unity Asset Store: https://assetstore.unity.com/packages/tools/character-customization-with-uma-2-0-49847#description

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