public GameObject singleChar;
    public GameObject bothChar;

    public GameObject charOne;
    public GameObject charTwo;

    private void Start()
    {
        singleChar.SetActive(true);
        bothChar.SetActive(false);
    }

    private void OnTriggerEnter(Collider other)
    {
        if (other.CompareTag("Player") || other.CompareTag("PlayerTwo"))
        {
            singleChar.SetActive(true);
            bothChar.SetActive(false);
        }
    }

    private void Update()
    {
        if (charOne.transform.position.x < -430f && charTwo.transform.position.x < -430f)
        {
            singleChar.SetActive(false);
            bothChar.SetActive(true);
        }
    }
}