How to prevent non-collider-objects from touching each other?

Hi, I created a game where ghosts are following the player. There are certain points where these ghosts are spawned. But, after a few seconds, they get into each other or combine with each other because there is only one path that follows the player. I thought preventing them to do that would solve the problem, so I thought of adding colliders, but that would also make them collide with other objects, which I don't want. What should I do? Here is my code: For the Ghosts:

 public class Ghost : MonoBehaviour
 {
 
     public float speed;
     public float StoppingDistance;
     public float RetreatDistance;
     public float idleDistance;
     private Transform TargetPlayer;
 
     private float TimebetweenShots;
     public float StartTimebetweenShots;
 
     public GameObject Projectile;
 
 
 
     // Start is called before the first frame update
     void Start()
     {
         TargetPlayer = GameObject.FindGameObjectWithTag("Player").GetComponent<Transform>();
         TimebetweenShots = StartTimebetweenShots;
 
     }
 
     // Update is called once per frame
     void Update()
     {
         if (transform.position.x > TargetPlayer.position.x)
         {
             transform.eulerAngles = new Vector3(0, 180, 0);
         }
         if (transform.position.x < TargetPlayer.position.x)
         {
             transform.eulerAngles = new Vector3(0, 0, 0);
         }
         if (Vector2.Distance(transform.position, TargetPlayer.position) > StoppingDistance)
         {
             transform.position = Vector2.MoveTowards(transform.position, TargetPlayer.position, speed * Time.deltaTime);
         } else if (Vector2.Distance(transform.position, TargetPlayer.position) < StoppingDistance && Vector2.Distance(transform.position, TargetPlayer.position) > RetreatDistance)
         {
             transform.position = this.transform.position;
         } else if (Vector2.Distance(transform.position, TargetPlayer.position) < RetreatDistance)
         {
             transform.position = Vector2.MoveTowards(transform.position, TargetPlayer.position, -speed * Time.deltaTime);
 
         }
         if (TimebetweenShots <= 0)
         {
             Instantiate(Projectile, transform.position, transform.rotation);
             TimebetweenShots = StartTimebetweenShots;
         }
         else
         {
             TimebetweenShots -= Time.deltaTime;
         }
     }
 }
 

And this is the code for spawning if anyone needs it:

 public class GhostSpawner : MonoBehaviour
 {
     public float startTimeBetweenSpawns;
     private float TimebetweenSpawns;
     public float SpawnDistance;
     public GameObject Ghosts;
 
     // Start is called before the first frame update
     void Start()
     {
        TimebetweenSpawns = startTimeBetweenSpawns;
        Instantiate(Ghosts, transform.position, transform.rotation);
     }
 
     // Update is called once per frame
     void Update()
     {
 
         if (Vector2.Distance(GameObject.FindGameObjectWithTag("Player").GetComponent<Transform>().transform.position, gameObject.transform.position) <= SpawnDistance)
         {
 
             if (TimebetweenSpawns <= 0)
             {
                 Instantiate(Ghosts, transform.position, transform.rotation);
                 TimebetweenSpawns = startTimeBetweenSpawns;
             }
             else
             {
                 TimebetweenSpawns -= Time.deltaTime;
             }
         }
     }
 }

Also, here is a screenshot from my gameplay.

Here there are actually three ghosts.