Unity Update() Function causing a NullReferenceException that isn't there if I manually call the function

I have a pretty "basic" combat class here. It has a Player and an Enemy. They are inherrited from a Character class and have values such as health, armor and ar (attack rating (damage)). I am trying to set the combat up in a way so that once you press a button (in this case, e), you attack the enemy and the enemy attacks you. I think this is most easily done by having a method in Update() which constantly checks whether or not my desired key is pushed, and if it is, to execute said method which has 2 attacks. I have rearranged the program so that the Player and Enemy are saved seperately in the methods "savePlayer" and "saveEnemy".

Relevant global objects:

   public Player Player;
   public EnemyCharacterCreator Enemy;

   public Player savedPlayer;
    public EnemyCharacterCreator savedEnemy;
    public Text[] savedArray;

My constructor:

public Combat(Player Player, EnemyCharacterCreator Enemy, Text[] texxtArray)
    {
        savePlayer(Player);
        saveEnemy(Enemy);
        saveTextArray(texxtArray);
        textChanges();
     // FightLoop();
}

Aforementioned methods:

 public void savePlayer(Player Player)
    {
       savedPlayer = Player;
    }

    public void saveEnemy(EnemyCharacterCreator Enemy)
    {
      savedEnemy = Enemy;
    }

Combat-related code:

public void attackButton()
    {
        if (Input.GetKeyDown("e") == true)
        {
            FightLoop();
        }
    }
    public void FightLoop()
    {
            PlayerAttack();
            EnemyAttack();
            textChanges();
    }

    public void PlayerAttack()
    {
        savedEnemy.health = savedEnemy.health - savedPlayer.ar;
    }

    public void EnemyAttack()
    {
        savedPlayer.health = savedPlayer.health - savedEnemy.ar;
    }

Conceptually this should work fine, except it doesn't. When I "manually" execute FightLoop() in the constructor (commented out in the first code block) it works and the enemies health is reduced by 45 (which is my players' ar value), yet when I put attackButton() into the Update() function I get a NullReferenceException whenever I press e. 1 The error leads to line 74, which is the only line within the PlayerAttack() method:

savedEnemy.health = savedEnemy.health - savedPlayer.ar;

I put a breakpoint there and the savedEnemy object was null. I have no idea why, it is a global object and it works perfectly when I do it "manually", without Update(). Help would be appreciated.

A Minimal Complete Verifiable Example as requested in the comments:

There are 4 Scripts.

Combat:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class Combat : MonoBehaviour
{
    bool playerTurn = true;
    bool invActive = false;

   

    public Player Player;
    public Enemy Enemy;
    public Text[] textArray = new Text[6];

    public Player savedPlayer;
    public Enemy savedEnemy;
    public Text[] savedArray;




    public Combat(Player Player, Enemy Enemy, Text[] textArrayPass)
    {

        savePlayer(Player);
        saveEnemy(Enemy);
        saveTextArray(textArrayPass);

        //textChanges();
        // FightLoop();
        textChanges();

    }

    public void saveTextArray(Text[] textArray)
    {
        savedArray = new Text[6];
        savedArray = textArray;
        //Debug.Log(savedArray[0].text);
    }
    public void savePlayer(Player Player)
    {
        savedPlayer = Player;
    }

    public void saveEnemy(Enemy Enemy)
    {
        savedEnemy = Enemy;
    }

    public void attackButton()
    {
        if (Input.GetKeyDown("e") == true)
        {
            Debug.Log(Player.health);
            FightLoop();
            Debug.Log(Player.health);
        }
    }
    public void FightLoop()
    {
        PlayerAttack();
        EnemyAttack();
        textChanges();
    }

    public void PlayerAttack()
    {
        savedEnemy.health = savedEnemy.health - savedPlayer.ar;
    }

    public void EnemyAttack()
    {
        savedPlayer.health = savedPlayer.health - savedEnemy.ar;
    }

    public void textChanges()
    {
        savedArray[0].text = savedPlayer.health.ToString();
        savedArray[1].text = savedPlayer.armor.ToString();
        savedArray[2].text = savedPlayer.ar.ToString();

        savedArray[3].text = savedEnemy.health.ToString();
        savedArray[4].text = savedEnemy.armor.ToString();
        savedArray[5].text = savedEnemy.ar.ToString();

    }

   



    // Start is called before the first frame update
    void Start()
    {
        
    }

    // Update is called once per frame
    void Update()
    {
        attackButton();
    }

    private void Awake()
    {
        Combat fight = new Combat(Player, Enemy, textArray);
    }
}

Character:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Inventory
{

    public int[] inventory;
    public Inventory(int inventorySlots)
    {

        inventory = new int[inventorySlots];
        Debug.Log("Your Inventory has " + inventorySlots + " slots.");
    }
}

public class Character : MonoBehaviour
{
    public Inventory charInventory;
    public int health = 125;
    public int armor = 10;
    public int cash = 100;
    public int ar = 45;

    public bool weaponEquipped;
    public Character()
    {
        Inventory charInventory = new Inventory(20);
    }
    //HaheaghehAEH
    public void attack(Character enemy)
    {
        int oldHealth = enemy.health;
        enemy.health = enemy.health - ar;
        int damage = oldHealth - enemy.health;
        Debug.Log(damage + " damage!");
    }
    public Character returnChar()
    {
        Character x = new Character();
        return x;
    }
}

Player:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Player : Character
{
    public Player()
    {
        health = 150;
        ar = 45;
    }

}

Enemy:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Enemy : Character
{

    public Enemy()
    {
        health = 87;
        ar = 15;

        Inventory enemyInventory = new Inventory(5);
    }
}

Error Message

Enemy object gets saved in savedEnemy

Filled