A simple class that implements a static MonoBehaviour

StaticMonoBehaviour.cs

using UnityEngine;

/*
Creating new class
public class MyClass : StaticMonoBehaviour<MyClass> 
{
public void MyMethod(){}
}

Usage 
MyClass.Get().MyMethod();

When you call Get(), a new game object is created, a component of your class is added, and a static reference to it is specified. 
When the Get() method is called again, only the reference will be returned!
*/


public abstract class StaticMonoBehaviour<T> : MonoBehaviour where T : MonoBehaviour
{
    private static T Instance;

    public static T Get(bool DontDestroy = true)
    {
        if(Instance == null) 
        {
            GameObject go = new GameObject(typeof(T).Name+"_Static");
            if (DontDestroy)
            {
                DontDestroyOnLoad(go);
            }
            Instance = go.AddComponent<T>();
        }
        return Instance;
    }
}