How do you reference a gameobject in a script on a prefab?

I have a 2d game that I’m messing with the perspective of objects. For example, being able to walk infront of and behind certain things like trees, fences, etc and having the layers sorting to that perspective. I have some code written that does that, but my problem is that since the game is randomly generated, the script is on prefabs, but, for now, my character is an object in my scene. Unity won’t let me drag and drop that as the reference. So how can I go about that in script?

public GameObject DOGE;
private Renderer SR;

    if(DOGE.transform.position.y < (gameObject.transform.position.y - 0.5f))
    {
        SR.sortingOrder = 0;
    }
    else
    {
        SR.sortingOrder = 5;
    }

  Because the game is randomly generated, I will probably have to have other prefabs detect other prefabs for things like collisions or other various interactions, any help into this would be greatly appreciated! :D

It seems very odd that you can’t drag and drop an object from your hierarchy onto the DOGE field as if it’s in the hierarchy then it will be of type GameObject.

If you want to do it via script and have a reference somewhere else in your code you can do this.

DOGE = Player.Instance.gameobject

Using this as an example

public class Player : MonoBehaviour
{
    public static Player Instance;
    void Start()
    {
        Instance = this;
    }
}

Give tag Player to your gameObject player. In start function
void Start()
{
DOGE = GameObject.findGameObjectWithTag(“Player”);
}
it will assign your player to DoGe. Hope it will work.