TextMesh Pro

using UnityEngine;
using TMPro; // TextMesh Pro namespace

public class TMPController : MonoBehaviour
{
  // TMP_Text works for both UI and World Space
  [SerializeField] TMP_Text titleText;
  [SerializeField] TMP_Text damageText;

  public void ShowDamage(int amount, bool isCrit)
  {
      if (isCrit)
      {
          // Critical hit: gold, larger type
          damageText.text = $"<color=#fbbf24><size=1.5em><b>CRIT {amount}</b></size></color>";
      }
      else
      {
          damageText.text = $"<color=red>-{amount}</color>";
      }
  }

  public void SetTitle(string name, int level)
  {
      // TMP_Text.SetText() can be cheaper than assigning .text
      titleText.text = $"{name} <size=0.7em><color=#64748b>Lv.{level}</color></size>";
  }

  // Vertex color without tags
  public void SetColor(Color c)
  {
      titleText.color = c;
  }
}

using UnityEngine;
using System.Collections;
using TMPro;

public class TypewriterEffect : MonoBehaviour
{
  [SerializeField] TMP_Text dialogText;
  [SerializeField] float charDelay = 0.04f;

  Coroutine current;

  public void ShowText(string text)
  {
      if (current != null) StopCoroutine(current);
      current = StartCoroutine(TypeRoutine(text));
  }

  IEnumerator TypeRoutine(string text)
  {
      dialogText.text = text;
      dialogText.ForceMeshUpdate(); // Rebuild the mesh immediately

      TMP_TextInfo info = dialogText.textInfo;
      int total = info.characterCount;

      // Hide every character via alpha
      for (int i = 0; i < total; i++)
      {
          SetCharAlpha(i, 0);
      }

      // Reveal one by one
      for (int i = 0; i < total; i++)
      {
          SetCharAlpha(i, 255);
          dialogText.UpdateVertexData(TMP_VertexDataUpdateFlags.Colors32);
          yield return new WaitForSeconds(charDelay);
      }
  }

  void SetCharAlpha(int charIdx, byte alpha)
  {
      TMP_TextInfo info = dialogText.textInfo;
      if (charIdx >= info.characterCount) return;
      int matIdx = info.characterInfo[charIdx].materialReferenceIndex;
      int vertIdx = info.characterInfo[charIdx].vertexIndex;
      Color32[] colors = info.meshInfo[matIdx].colors32;
      for (int k = 0; k < 4; k++) colors[vertIdx + k].a = alpha;
  }
}