SetCharArrayのChar版

ShowCharacter4.cs

using UnityEngine;
using TMPro;

public class ShowCharacter4 : MonoBehaviour
{
    [SerializeField]
    TextMeshProUGUI label;

    [Range(0, 99999)]
    [SerializeField]
    int count;

    char[] characters = new char[5];
    const char zero = '0';

    void Update()
    {
        var value = count;
        for (int i = characters.Length - 1; i >= 0; i--)
        {
            characters[i] = (char)((value % 10) + zero);
            value /= 10;
        }

        label.SetCharArray(characters, 0, characters.Length);
    }
}