My book about programming a character customization system in Unity has just released. Get it now for a huge discount!

https://jettelly.com/store/mastering-character-customization-in-unity
Both 3D characters and 2D animated in Spine! Includes UI development, using ScriptableObjects, saving JSON data, loading Addressables, etc.
I uploaded a demo of customization system for the Spine2D character:
https://jhocking.itch.io/2d-character-customization