NameTag_KL.cs

using UnityEngine;
using UnityEngine.UI;

public class NameTag : MonoBehaviour {

    public string displayName;
    public Text targetName;
    private bool isDisplaying = false;
   
    void Start() {

        //Debug.Log(gameObject.GetComponentInChildren<Text>());
        targetName = gameObject.GetComponentInChildren<Text>();
        targetName.color = Color.clear;

    }

    void Update() {

        if (isDisplaying) {

            targetName.text = displayName;
            targetName.color = Color.Lerp(targetName.color, Color.green, 10 * Time.deltaTime);

        }
        else {

            targetName.text = displayName;
            targetName.color = Color.Lerp(targetName.color, Color.clear, 10 * Time.deltaTime);
        }
    }

    void OnMouseOver() {
        isDisplaying = true;
    }

    void OnMouseExit() {
        isDisplaying = false;

    }

}