How to inherit Animator?

Questions & Answers
1

I create a CustomAnimator which inherit Animator like this:

public class CustomAnimator : Animator
{
    // Some custom data
}

There is no compile error, but I cannot find the CustomAnimator in AddComponent Menus, why?

2

Up
Animator does not inherit from MonoBehaviour, directly form Behaviour, and despite that he can be added as a component. Why does an inherited class of animator not have this component status ?