RandomPlayerMaterial

using UnityEngine;

public class RandomPlayerMaterial : MonoBehaviour
{
    [SerializeField] private Material[] _materials;
    [SerializeField] private MeshRenderer _playerMesh;

    private void Start()
    {
        SetRandomMaterial();
    }

    [ContextMenu(nameof(SetRandomMaterial))]
    private void SetRandomMaterial()
    {
        Material oldMaterial = _playerMesh.materials[2];
        Debug.Log("oldMaterial = " + oldMaterial,oldMaterial);

        int random = Random.Range(0, _materials.Length);

        Material newMaterial = _materials[random];

        Debug.Log($"newMaterial = {newMaterial}", newMaterial);

        foreach (Material material in _playerMesh.sharedMaterials)
            material.mainTexture = newMaterial.mainTexture;
    }
}