Randomly generating Character Controllers?

So I made a prefab of an enemy in my game. It's a character controller instead of a normal gameobject, so that the movement of the enemy was more advanced. I was wondering if it's possible to randomly generate this object?

Here's my code (which would work if it was actually a gameObject)

using UnityEngine; using System.Collections;

public class RandomGenerationEnemy : MonoBehaviour {

 // Use this for initialization

 public GameObject[] enemyArray;
 public int amount;
 private Vector3 spawnPoint;


 void Start () 
 {

 }
 
 // Update is called once per frame
 void Update () 
 {
     enemyArray = GameObject.FindGameObjectsWithTag("Enemy");
     amount = enemyArray.Length;


     if (amount != 2)
     {
         spawnEnemy();
     }
 }


 void spawnEnemy()
 {
     spawnPoint.x = Random.Range(700, 800);
     spawnPoint.y = 21.6f;
     spawnPoint.z = Random.Range(500, 600);

     Instantiate(enemyArray[UnityEngine.Random.Range(0, enemyArray.Length - 1)], spawnPoint, Quaternion.identity);
     CancelInvoke();
 }

}

now I've already tried this, but the problem is that it won't work because Enemy isn't tagged. I assume it's because my enemy is a character controller. If this is the case can anyone tell me how I can modify this so it works with character controllers? And if it really is the game object why isn't it working?