public class InitializableMonoBehaviour : MonoBehaviour
{
    private bool _isInitialized = false;
    protected virtual void Initialize()
    {
        Assert.IsFalse(_isInitialized);
        _isInitialized = true;
    }
    private void Start()
    {
        Assert.IsTrue(_isInitialized);
    }
}

public class BasicMonoBehaviour : InitializableMonoBehaviour
{
    protected GameObject RootObject;
    protected Transform RootTransform;
    protected override void Initialize()
    {
        base.Initialize();
        RootObject = gameObject;
        RootTransform = RootObject.GetComponent<Transform>();
    }
}

public class PhysicMonoBehaviour : BasicMonoBehaviour
{
    protected Rigidbody2D RootRigidbody;
    protected override void Initialize()
    {
        base.Initialize();
        RootRigidbody = RootObject.GetComponent<Rigidbody2D>();
        if (RootRigidbody == null)
            RootRigidbody = RootObject.AddComponent<Rigidbody2D>();
    }
}