using UnityEngine;
using AdvancedPeopleSystem;

public class DemoScript : MonoBehaviour
{
    public CharacterCustomization character;

    private void Update()
    {
        if (Input.GetKeyDown(KeyCode.Q))
        {
            character.SetHeadSize(Random.Range(-0.25f, 0.25f));
        }
    }
}

Press Q to change character head size

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