Everybody seems to be starting with their #1s so I guess I’ll do too.
Khyber: LOVED the concept, LOVE the Nemetrix. Sadly his existence and the existence of the Nemetrix does kind of leave a plothole in the story and also discredits the Omnitrix by making all of them (save the Gourmands) prey.
Dr. Animo: I consider Animo to be Ben’s true archenemy. While Ben’s power stems from the stars above, this dude’s power stems from our earthly animals. Love his gorilla suit and his comedy. I can consider him tied with Eon for the #5 spot.
Aggregor: So much potential and fun, lackluster end.
Attea: Froggy GF in love with Ben lmao.
When I first heard and watched Omniverse, I wasn’t into it because of the art change. I still gave it a shot though and I loved it the moment this guy showed up. Malware was an evil version of Upgrade, except he’s actually more than that.
Malware is personal.
Malware represents Azmuth’s flaws, how despite being the smartest being in the universe save the Celestialsapiens above he was still unable to fix Malware. Malware is the dude who destroyed Feedback, and set Ben on a path of never exploiting the lifeform lock and never favoritizing an alien like the way he did Feedback ever again. Sure Ben constantly called for Humungousaur or Four Arms now and again, but it was always when heavy hitters like them were basically the best choice. Ben back then chose Feedback because he was Feedback rather than because he was right for the situation.
And of course, his defeat. How Ben reconciles with himself and Feedback’s eventual return along with the Galvanic Mechamorphs to defeat Mega Malware was beautiful. That’s why he’s my favorite Ben 10 Villain.
Albedo is the second smartest Galvan in the world, second only to Azmuth the First-Thinker, making him arguably the second smartest being in all of Ben 10 Canon. Out of his own envy he tried to mimic and then surpass Azmuth. This led him to creating his own Omnitrix, and the much beloved Ultimatrix.
Also his love for Chili Fries is hilarious. Kind of a shame that my buddies think of the girl from Overlord or the dude from Genshin rather than the man who gave us Ultimate Humungousaur.
Ben 10’s archenemy (personally I think it’s Dr. Animo). Vilgax has always been Ben’s deadliest foe since the beginning. Sadly however he peaked during Ultimate Alien, and his continued appearances as an antagonist in Omniverse were clearly forced. Anyone else could’ve taken the Malware Suit, anyone else could’ve set off the time bomb. Those events aren’t really Vilgax they’re just Vilgax doing things.
Still though, the man was an absolute unit and ridiculously fun to watch during Alien Force and Ultimate Alien. Seeing him shatter chromastone and defeat Ultimos was legit. Aside from that, he met George Washington, is scared of Mama Vreedle, renamed his planet Murray into Vilgaxia and lives in a planetary system called, I kid you not, The Shadow Realm.
Technically a Kevin 11 villain but whatever. Ragnarok killed Kevin’s father.
The Rooters Arc was dumb, it was really, really dumb. I get it, it’s better to have some thing originate from Earth every once and a while rather than rely on other planets, but why did you have to retcon Osmosians? It’s one of the weakest parts in the entirety of Omniverse and we have an entire arc around that.
The worst offenses of the Rooters Arc was of course its terrible retconning, how everything was actually a false memory done by Servantis. It ruins the weight and wonder of the things constructed in previous seasons. This dude was Ragnarok, the psychopath who killed Devin Levin. The man who Kevin hated so much that even when he was beaten and begging for mercy Kevin still killed him.
I’ve never seen Kevin so worked up during the entirety of Ben 10 Classic. Sure he got angry when his car keeps getting wrecked, or that time he was basically an evil terrorist. But when Ragnarok was loose, Kevin was like a whole different guy and it helps show how much both anger and purpose, no matter how twisted, affects an individual, especially a fatherless one like Kevin.
The most unique evil Ben from another timeline, because he doesn’t have a watch, he’s the enemy of Professor Paradox, he’s older than all the other Bens and he honestly should’ve been the guy to set off the bomb.