5 minutes on wikipedia and I can already make a list that's way better than no_brains, yet completely different from nermy's

1. The Celestials (which is actually a group of characters, but I'll just count it as one entry to make this list more interesting)
2-3. Master Order / Lord Chaos
4. Sise-Neg
5. And uh I dunno, let's say The Watchers (even though they don't really do anything with their powers)