Here's how you can think about it:
* Universal: Something that is true or applies everywhere and to everyone.
* Comparative: You wouldn't typically use a comparative form like "more universal" because it doesn't logically make sense. You can't have something that is "more all-encompassing" than "all-encompassing".
* Superlative: "Universal" itself is already the superlative form.
Let me know if you had something else in mind or if you have any other questions!