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1. Alien X
2. Ultimate Ben
3. Ultimate Way Big
4. Ultimate Heatblast
5. Ultimate Wildmutt
1. All the celestialsapiens
2. Atomic-x
3. Sir george
4. A lot of vaxasaurians (but he has dumb scaling)
5. Vilgax with a little and all of dagons power
6. Dagon
7. Paradox
8. Almost every tokustar in the multiverse
9. Almost every naljian
10. A lot of anodites
11. Possibly some female versions of his race
12. Almost every chronosapien
13. Possibly some chronians
14. Charmcaster
15. Hex
16. Every future/present Ben and gwen
17. Kevin 11000 (original that got beat up by Ben and survived)
18. Litteraly cannonbolt, who killed a dude who sucked all the magma from multiple planets (at least multiple island level) and his guards the first time Ben used him
19. Alot of aliens who belong to Jetray and xrl8s species
20. Malware
21. Ultimate aggregor
22. Ultimate kevin
23. Rook who fought with that chronosapien who casually beat atomic-x and survived
24. Alot of aliens who belong to echo echos species
25. A lot of ultimate aliens
26. Grandpa max in his prime with his weapons
Basically a lot of people and if you mean everyone in fiction then I could make a list with 1000 characters