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Characters: Ben 10 Supporting Characters
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    Julie Yamamoto 

Julie Yamamoto

Voiced by Vyvan Pham

Ben's Love Interest introduced in Ben 10: Alien Force. Julie was originally a girl Ben met following one of his soccer matches. The two developed a quick interest in each other, but Ben started hesitating to make any approach, afraid she might reject him if she found out about the Omnitrix. When this eventually happened during their first date, Julie turned out to not be scared of him, and they ended up in a relationship. Though non-powered at first, Julie can rely on the support of Ship, an galvanic mechamorph pet she met and tamed after her first date with Ben, to assist her in fights.

  • Action Survivor
  • A Girl and Her Shapeshifting Weapon/Pet Alien
  • Battle Couple: With Ben, especially after getting Ship. Subverted however, because despite being involved in Ben's heroism several times and having Ship to help her fight, she's not into the whole "fight evil to save the world" bit.
  • Bound and Gagged: In "Revenge of the Swarm". By Elena, of all people.
  • Brown Eyes
  • Derailing Love Interests: Julie has become much less nice since the start of Ultimate Alien. Some of this is having to deal with Ben being famous (it was very justified in the episode with Captain Nemesis), but she's showing new traits such as being overly competitive and short-tempered that weren't originally present, possibly as a misguided attempt at giving her more flaws.
    • She joined what was effectively a cult in "Flame Keepers Circle." She thought it was a corporation that was trying to improve people's lives by introducing alien tech at a faster rate than the Plumbers wanted (despite Kevin and Ben both warning her that such an act typically destabilized planets). It was really a bunch of crazy people worshipping Vilgax, and it was ridiculously clear too, but she grabbed the Idiot Ball firmly until it was beyond obvious she was wrong.
  • Kid With The Remote Control: Ship.
  • Love Interest: To Ben during Alien Force and Ultimate Alien. They broke up prior to the Omniverse episode Rules of Engagement.
  • Magic Skirt: She could rival Lois Lane in this department. Even when she is playing tennis, the skirt barely flutters.
  • Morality Pet: She was the one who brought Ship back to reason when it was Brainwashed and Crazy by the Forever Knights.
  • Nice Girl
  • Official Couple: With Ben in Alien Force and Ultimate Alien. However, they broke up some time before Rules of Engagement in Omniverse.
  • Pink Means Feminine: Her clothes mostly consist in pink and white when in her regular attire.
  • Plucky Girl
  • Put on a Bus to Hell: Julie only appears in a single episode of Ben 10 Omniverse, "Rules of Engagement," in which her and Ben break up, and she gets a new boyfriend. Word of God made it known that she will not be returning again, and have actually gone on record that Ben will ultimately end up with Kai anyway so there's absolutely no chance of Julie and Ben getting back together again.
  • Satellite Love Interest: Initially appeared out of the blue (not helped by the fact many fans felt she was introduced just to get rid of the Incest Subtext between Ben and Gwen.); she gets better over time.
  • Sixth Ranger: Sort of; even in the Alien Force / Ultimate Alien era, she takes much less part in the story than most characters. She still helps Ben and the others on occasion.
  • Took a Level in Badass: Getting Ship helped with this, as he can turn into Powered Armor for her. She's also quite adept with certain weapons.
  • Took a Level in Jerkass: See Derailing Love Interests above.
  • Women Are Wiser: Gwen states that Julie is the smartest of their group because she doesn't go looking for trouble, presumably including herself in that category.
  • What Happened to the Mouse?: Is nowhere to be seen for the first 20+ episodes of Omniverse, with a number of Ben's offhand comments suggesting he is once again single.
    • She finally shows up again in Rules of Engagement....with a new boyfriend. In the same episode, it's explained in a flashback that Ben accidentally broke up with her during a phone call. At the end of it, she is Put on a Bus for good.

    Ship 

Ship

"Ship Ship !"
Voiced by Vyvan Pham

A small, dog-smart Galvanic Mecamorph (Upgrade's species) generated by Baz-L when he accidentally crashed on Earth. Ship was intended to find a Plumber and bring him for help; unfortunately, it mistook Ben's Omnitrix for a Plumber's badge, and, since it was unable to speak, had to try to get Ben's attention by attacking him and wrecking his date with Julie. Eventually, it succeeded in leading them to the ship, and they saved Baz-L in time. While he was leaving, Baz-L decided to leave Ship with them. It then developed a bond with Julie, effectively becoming her pet and main mean to fight.

    Azmuth 

Azmuth

Voiced by Robert David Hall (Original Series, Destroy All Aliens), Jeff Bennett (Alien Force and Ultimate Alien), Rene Auberjonois (Omniverse)

The brilliant, if cynical and obnoxious, creator of the Omnitrix. A hundreds years old Galvan (Grey Matter's species) considered as the smartest being in three galaxies, Azmuth created the Omnitrix as a mean to allow all specie to be in each other shoes and better understand each other, and as by this way promote peace. As such, he was disgusted when people like Vilgax attempted to use it as a weapon, becoming disabused with the Universe. After Ben proved him the Omnitrix could still be used for good however, he got back part of his hope in the Universe and started to act as one of Ben's Mentor.

  • Above Good and Evil: Had two variations of this over the course of the series:
    • In the Original series, he only wanted beings from the universe to understand each other, and the use of the Omnitrix as a weapon by one person was the same as another, and the sides and reasons did not matter.
    • Afterwards, his dedication became to the universe, and sees the universe as it is, as Albedo found out—The battles between good and evil within the universe are petty and insignificant. The ambition of those who are "evil" is ultimately pointless, as to tear down and destroy is of no consequence or quality.
  • The Atoner: He once created the Ascalon sword, a weapon so powerful it caused the destruction of the Inkursian home planet after one of them tried to use it to unify his species. This is partially the reason he then dedicated himself to pacifist causes.
  • Badass Bookworm: Not so much most of the time, but Showdown Part 1 demonstrates us that he can be quite a great exemple of it if needed.
  • Big Good: shares the position with Max and Paradox.
  • Composite Character: His Omniverse incarnation takes a few of the core personality traits from the first series, such as his Jerk Ass tendencies, but utilizes the general aesthetic of the Alien Force and Ultimate Alien incarnations as well as some of the gadgets (particularly the teleportation, which is explained).
  • Cool Old Guy: Zig-zagged; he is irrascible, pessimistic, insufferable and brash, but on the other hand, he is well-intentioned, and does displays a softer side on occasions.
  • Create Your Own Villain: A speciality of him; to date, he's responsible for turning the Inkurseans into space pirates, giving Sir George the Ascallon Sword, and accidentally screwing up the body and mind of Malware. It's also implied that his dickery was what led Albedo to turn out the way he is.
  • Cynical Mentor
  • Figure It Out Yourself: "Don't you want to figure it out on your own, like a true hero would?"
  • For Science!: This used to be his primary motivation until it cost him his girlfriend and he created a weapon that destroyed a planet; in the present his intentions are more altruistic, like creating the Omnitrix.
  • Good Is Not Nice: He is a well-intentioned scientist, a convinced pacifist and want nothing but good for the universe. Sadly, he has the bad habit to act like a dick with almost everyone around him.
  • Heel Realization: He realizes it's just stupid to blow up the universe when the Omnitrix is near self-destruction.
  • Insufferable Genius: Though he can back it up, much better than Albedo.
  • Jerk with a Heart of Gold
  • Mad Scientist: sort of; He is currently more or less a reasonnable scientist, but he still tends to be... eccentric, to say the less.
  • My God, What Have I Done?: His reaction when he found out what the Inkursians did with the Ascalon sword.
  • No Social Skills: That would almost be an understatment; Azmuth has a bad habit to act like an obnoxious jackass with a lot of people around him, even though he almost always mean well; his first assistant ditched him for not according her any credit about the creation of the Omnitrix, his other assistant developped a massive superiority complex on him that led him to commit a Face-Heel Turn, his girlfriend left him because he was neglecting her for his work (and he didn't notice she had left until it was far too late) and one of his creation became a rampaging sociopath because he took his time to find a cure to heal him.
  • Not So Different: He's immature, selfish, cracks jokes at inopportune times, but when it comes down to it, he can be helpful... sort of like Ben. This is all the more obvious when he says that he likes Ben for saying that he didn't want to figure out how to work the Omnitrix better (or, more specifically, allowing Ben to change forms at will within alien form).
  • Restored My Faith In the Universe: By the time Ben met Azmuth in Secret of the Omnitrix, the scientist had completely given up on the whole Universe, to the point that he was willing to let it, along with himself, be destroyed. However, after seeing Ben in action, he has a Heel Realization, helps Ben win, and becomes more rational in later episodes
  • Same Character, But Different: Was a lot more sarcastic and cynical when we first see him in Secret of the Omnitrix, but is more stoic and serious (though retaining a sense of sarcasm) by the time of Alien Force. Justified in that there was a five year Time Skip in-between appearances.
  • Science Hero
  • Sink or Swim Mentor
  • The Spock
  • Technical Pacifist
  • The Watcher: he can follow Ben's use of the Omnitrix on regular basis through elements inside the Omnitrix.
  • Took a Level in Jerkass: He has always been kind of a dick, but Omniverse tends to exaggerate this aspect of his personality; he openly doesn't care when Max asks him for help about Ben being trapt in alien forms and refuses to help until Ben starts wrecking his own lab, and takes a petty revenge on Albedo for capturing him by casually trapping him in a 10 years old Ben form.
  • Unwitting Instigator of Doom: His creation of Ascalon led to the destruction of the Incursean's homeworld, and giving it to George led to the foundation of the Forever Knights.

    Kai Green 

Kai Green

Voiced by Bettina Bush

Ben's first shown Love Interest, and granddaughter of Wes Green, a retired Plumber and old friend of Max. She began to take an interest in Ben after he began transforming into Blitzwolfer, though only because she wanted to keep him as a pet. According to a pop-up in the enhanced version original series episode ''Ken 10'', she is Ben's future wife and Ken's mother.

  • Action Girl: In Omniverse thanks to after school judo lessons.
  • Adventurer Archaeologist: Alongside her grandfather in Omniverse.
  • Ascended Extra: She originally only appeared in Benwolf, and made a cameo in Ben's dream in Perfect Day. She didn't return and wasn't mentioned until her return in Ominverse.
  • Belligerent Sexual Tension: She and Ben have this dynamic in Omniverse, which leads to
    • Everyone Can See It: The Forever Knights mistake them for boyfriend and girlfriend and rook calls their back and fourth arguing "romantic bantering".
  • Deadpan Snarker: Has become this in Omniverse.
  • First Girl Wins: A double subversion: it isn't the case at first in "Benwolf", but ends up being played straight after all in "Ken 10". Word of God even confirms that she is the ultimate winner in Ben's Omniverse "harem."
  • Flanderization: Her obsession for Blitzwolfer is less subtle in Omniverse than it was in the Original Series.
  • He's Not My Boyfriend: Says this about Ben in Omniverse. While it's true, there's clear sexual tension going on between them.
  • Kick the Dog: Infamous for this in the Original Series, where she got interested in Ben only because she wanted to keep Blitzwolfer as a pet, something she flat-out admitted in his face with no remorse. Even Gwen was outraged by such an attitude.
  • Love Interest: Ben's, though it's mostly one sided in the Original Series. In Omniverse, the two have Belligerent Sexual Tension in spades, hold each other's arms after Ben rescues her from falling off of Big Ben, though they break as soon as it's commented on. And gives him a goodbye kiss on the cheek.
  • Loves My Alter Ego: In her first appearance, she was more interested in Ben when he was Blitzwolfer. She shows signs of this in Omniverse, wanting Ben to turn into Blitzwolfer, and petting him when he does and subsequently saves her from falling (though she does give Ben a parting kiss on the cheek).
  • She Is All Grown Up: Ben points this out as soon as he meets her again in Omniverse. Then again, so's he.
  • Teeth-Clenched Teamwork: Once she and Ben meet again, this is the relationship they have.
  • Tomboy and Girly Girl: Girly-Girl to Gwen's Tomboy in "Benwolf".

    Paradox 

Professor Paradox/Timewalker

Voiced by David McCallum

An unknown scientist from the Cold War who was experimenting on Time Travel. His experiment went wrong, causing him to end up floating randomly through space and time for ten thousand years, unable to die or age. Though initially becoming insane because of it, he eventually became Bored With Insanity, and was able to take control over his time travel, starting to use it to save Earth at various points by alternating the course of time. This led him to meet with Ben's team during the Alien Force era. Though eccentric, he is otherwise a reliable ally.

  • The Ageless: Due to existing outside of time, he can't age and apparently also doesn't need to eat or sleep. This also makes him immune to time manipulation to some degree (he can't be aged into dust or anything like that, but he still feels it to some degree).
  • Artificial Limbs: His Omniverse version apparently lost his hand in the Time War and has replaced it with a bionic hand.
  • Badass: Well, he is based on the Doctor, so this is a given.
    • Cultured Badass: He dresses and speaks the part.
    • Badass in a Nice Suit: Nice tie.
    • Badass Boast: Tells Eon that if he goes through with his plan, no force in all of time will be able to protect him from Paradox.
    • Badass Bookworm: Well, he used to be a scientist after all and since his field was studying and manipulating time... Well, he's better at that now.
    • Badass Pacifist: He doesn't like to fight and rarely does it, but gosh, when he does something, it is awesome. Watch War of the Worlds to see what we mean.
  • Big Good: Shares the position with Azmuth and Max.
  • Bored With Insanity: In his own words:
    "At first, I went mad, of course. But after a few millennia, I got bored with that, too, and went sane. Very sane."
  • Call Forward: Word of God said that in Race Against Time (a movie that's otherwise questionably canonical), Paradox guarded the Hands of Armageddon from Eon for several years until Ben stopped him.
    • This is finally revealed in "Ben 10,000 Returns". The movie was actually part of 'cross-time' and thus Paradox guarded that alternate timeline's Hands of Armageddon
  • Cloud Cuckoo Lander: His constant time travel and immortality cause him to often appear as this; he doesn't live events in the right order (for example, he apparently met a future version of Ben before meeting present Ben for the first time) and will offer gumballs to people in unappropriate situations.
  • Cool Old Guy: He doesn't look like it, but he is really 10,000+ years old.
  • Does Not Like Guns: When first meeting Colonel Rozum, he removes his gun from him without him noticing and throws it away, saying he never liked them.
  • Expy/Homage: The Doctor, especially the tenth incarnation.
    • The quirk of offering gumballs brings to mind Tom Baker's Doctor (with him offering jelly babies.)
  • The Fog of Ages: He calls himself 'Paradox' because he can't remember what his real name is (despite the fact he meets an old colleague who does).
  • Go Mad from the Isolation: Spent nearly ten thousand years floating randomly through time, but eventually, he got Bored With Insanity and went sane again. Very sane.
  • The Herald: He will pop out of a time portal near Ben and say, "I need your help with X".
  • Hero of Another Story: He is constantly on adventures of his own and the first time he appears, it's stated he's already saved the world hundreds of times.
  • Mysterious Past: A past even he barely remember due to The Fog of Ages.
  • Offscreen Teleportation: He has this ability due to 'finding shortcuts' in time. Though he's also very capable of onscreen teleportation.
  • Only Known by Their Nickname: Everyone calls him Paradox, even himself. He says he has forgotten his name after the many millennia he has lived, though his former lab assistant appears to be the only one left knowing.
  • Persona Non Grata: He is banned from interacting with Alien X (or any Celestialsapien, for that matter), for reasons unknown.
    • May have something to do with hiding the Forge of Creation, which is a Noodle Incident in itself.
  • Really 700 Years Old: He looks middle-aged but is the oldest thing in the series, other than the universe itself.
    • And considering the current universe is an Alien-X made reboot, he may have graduated to oldest thing period.
  • Set Right What Once Went Wrong: His job for the past several hundred years.
  • Sink or Swim Mentor: In the sense that he can't outright interfere, but he does provide hints and warnings that help guide Ben and the others' actions.
  • Stealth Mentor: Goes right along with Sink or Swim Mentor.
  • Temporal Paradox: Once a theory of his, now the frequent results of his actions.
  • Time Abyss: Originally from The Fifties, he was sent back to the beginning of time and went on from there.
  • Time Dissonance: He can displace his time and location at will and he doesn't need to eat or sleep. He never ages.
  • Time Master: See: Time Dissonance.
  • Time Police: Self-appointed.
  • Time Travel Tense Trouble: For instance, "You're much smarter than you were when I met you later."
  • Trickster Mentor: Another technique he uses.
  • You Can't Fight Fate: Played with; he himself constantly changes the timeline to save the world, but much like the character he is based on, he seems to follow the idea that there are some events that cannot be changed. Most notably, he advises Gwen against trying to prevent Kevin's mutation in season 3 of Alien Force.

    The Plumbers 

The Plumbers

  • Arch-Enemy: They used to be this with an alien species called Sludgepuppies. The whole point of Big Fat Alien Wedding was to end the conflict by marrying their Star-Crossed Lovers.
  • Cardboard Prison: Plumber HQ in Omniverse is absolutely terrible at keeping its prisonners; villains constantly escape from it, sometimes offscreen (like Psyphon, who got arrested around three times yet always is on the run again by the next episode he shows up), and when they are shown escaping (Albedo, Dr Animo and Zombozo), they do it incredibly easily. Lampshaded by Ben in Something Zombozo Comes This Way when he and Max discovers Zombozo managed to easily escape and pretend he was still there by leaving a kidnapped Plumber disguised as him, with nobody apparently considering checking him sooner, nor anyone finding it suspicious a Plumber disappeared.
    Ben: "Plumbers HQ really needs to work on its security system, Grandpa!"
  • Elaborate Underground Base: In Omniverse, their headquarters in Bellwood are this.
  • In-Series Nickname: "Red spots" in Omniverse, due to their red-coloured badges. Note that this is only the case in Omniverse; their badges were never shown in the Original Show, and were portrayed as looking similar to the Omnitrix symbol in the Alien Force/Ultimate Alien era.
  • The Men in Black: In the Original Series.
  • Men of Sherwood: When they aren't falling under Police Are Useless, they are this.
  • Order Reborn: As explained in Omniverse, the group was rebuilt during the Time Skip between the Original Show and Alien Force.
  • Police Are Useless: For most of the Alien Force/Ultimate Alien era, they were pretty useless the few times we saw them. They get slightly better in Omniverse due to being more present on Earth, but they still tend to be conveniently absent or ineffective whenever they could end the episode quickly (for example, they don't show up at all when Looma's father threatens to blow up Earth in Many Happy Returns), villains manage to easily infiltrate their HQ several times despite all the security systems, and their prison still somehow fails to keep criminals like Psyphon contained for a long time. Also, they recruited Blucik and Driba as their technology expert.
  • Retcon: In the Original Show, they were portrayed as a mostly human secret organisation that dealt with paranormal. In the sequels, they are portrayed as a space police where most members are aliens.
    • They were also explicitly stated in Ultimate Alien to only deal with aliens, to the point they couldn't get involved in arresting supervillain King Vicktor due to him being originally human; in Omniverse, they are seen dealing with some non-alien villains such as Doctor Animo and Billy Billion (who are both full-blood humans) and Zombozo (who has been confirmed by Word of God to be a supernatural being).
  • Retired Badass: In the Original Series, most Plumbers we get to see are retired members who stopped their activities long ago, but still have plenty of skills and alien tech at their disposal.
  • Shout-Out: Their armors in the Original Series were very reminiscent of the Ghostbusters.
  • Space Police: In Alien Force onward.

Important Plumbers:

Magister Patelliday

Voiced by Rob Paulsen

A Pisciss Volann (Ripjaw's species) Plumber, and the second-in-command of the Plumbers on Earth.

  • Alluring Anglerfish: being of Ripjaw's specie will make you that, though he is not as impressive as Ben's version of his species.
  • Ascended Extra: he appeared for the first time as a cameo character in Ultimate Alien episode Mother of All Vreedles. Ben 10: Omniverse makes him the Second-in-Command of the Earth' Plumbers and a recurring character.
  • Badass
    • Badass in Distress: in Gone Fishing, he is captured by Space Pirates who attempt to serve him to their captain as lunch. Max display limited concern, insisting Patelliday can handle himself of his own. He indeed escapes easily before they arrive: the only reason he was staying as a prisoner was to better figure out what the pirates were up to.
    • Crouching Moron, Hidden Badass: his appearance and mannerism are much less impressive than Ripjaw, and he seems like a comical character at the first approach, but much like Max, he is more than meet the eyes, as proven in Gone Fishing.
  • Mauve Shirt: Is one of the few named Plumbers outside of Max and the main cast, and he recurs quite frequently (compared to the other magisters: Labrid and Gilhil).
  • More Teeth than the Osmond Family: not as obvious as for Ripjaw, but still visible.
  • Number Two: To Max.
  • Remember the New Guy: He has been introduced in Ultimate Alien only, but both a conversation between Max and him and a a comment from Phil suggest that he was there before the Plumbers disbanded pre-Original Series, and might even have been the first alien Plumber to operate on Earth.
  • Shout-Out: His voice is a homage to comedian Don Knotts, who starred in The Incredible Mr Limpet as a man who becomes a fish.
  • Super Not-Drowning Skills
  • Weaksauce Weakness: Averted; according to Word of God, his suit includes systems that allow him to stand out of water without dehydrating like his species usually does. Still a problem in the season 3 finale, where a month in captivity with minimal water is enough to overwhelm the suit.

Magister Labrid

Voiced by Jeff Bennett

A Plumber officer, and one of Max's friends in the Plumber; He shows up in Alien Force's Pilote to investigate on the Hightbreed invasion and help Ben find Max. He gets killed, and leaves to Ben the mission to end the invasion.

Magister Prior Gihill

Voiced by JK Simmons

The Plumber officer in charge of the sector where Earth is located during the Alien Force/Ultimate Alien era.

Victor Valadis

Played by Hebert Siguenza (Alien Swarm), Brian George (Ultimate Alien)

A Plumber introduced in the Ben 10: Alien Swarm movie, and Elena's father.

  • Brainwashed and Crazy: Courtesy of the Hive.
  • Cassandra Truth: He tried to warn the other Plumbers about the sentience of the Hive, but wasn't listened to.
  • Dropped a Bridge on Him
  • Killed Off for Real: In Ultimate Alien.
  • Large Ham: In Alien Swarm, while controlled by the Hive.
  • Mad Scientist: subverted; he was believed to be this, but his actions actually had a really sane motive.
  • Posthumous Character: In Revenge of the Swarm.
  • Red Herring: The beginning of Revenge of the Swarm sets him up as the main antagonist for the episode. He actually was dead in the time between Alien Swarm and that episode; the real villain is Elena, possessed by the Hive.
  • Shaggy Dog Story: Ben goes through a lot of trouble in Alien Swarm to defeat the Hive without having to kill him... only to have him die anyway in Revenge of the Swarm.

Blukic and Driba

Voiced by Paul Eiding (Blukic) and Eric Bauza (Driba)

A duo of Galvans introduced in Ben 10: Omniverse. The two of them are tech support in the Plumbers' HQ, in charge mostly with machines. Though they possess advanced knowledge in technology like all Galvans, they are incredibly dumb when it comes to practically everything else.

  • Aliens Speaking English: While that is very obvious in this universe, they take it Up to Eleven by being able to write in English, albeit poorly spelled.
  • Are You Pondering What I'm Pondering?:
    Driba: Are you thinking what I'm thinking?
    Blukic: I hope not.
  • Attention Deficit... Ooh, Shiny!: in one episode, they are distracted by a Mr Smoothie commercial while Ben and the other Plumbers are dealing with a crisis.
  • Big Guy, Little Guy: They're both pint-sized, but Blukic is tall while Driba is short and squat.
  • Fantastic Racism: They seem to have it out for Cerebrocrustaceans, as they have been known to make unpleasant comments about the species at least twice in the show.
    Driba: "We are not Cerebrocrustaceans; we know what we are doing."
  • Fat and Skinny
  • Gadgeteer Genius
  • Genius Ditz: They aren't considered smart by Galvan standards, and Ben often gets annoyed by their stupidity. They are still smart enough to repair the Omnitrix when a piece is missing in "Outbreak", albeit after several failed attempts. In Catfight, they also created a remote control for the Omnitrix.
  • Guttural Growler: Blukic has a gravelly, bass voice.
    Blukic: ayup...
  • Informed Ability: Despite being recognized as dumbasses by Galvan, they are supposely smarter than any human being, and even smarter than Cerebrocrustaceans. As Ben lampshades it, we have yet to see any indication of that.
  • The Load: Safe for a few times where they actually prove useful, they tend to mostly makes things worse for the Plumbers, and their stupidity almost killed the heroes at least twice. You seriously come to wonder why they even keep them around.
  • Metaphorgotten:
    Driba: Like Icarus, we flew too close to the sun. And like Icarus, we never got our smoothies...
  • Nice Job Breaking It, Hero: They fixed the Anihilarg.
  • Noodle Incident: When the two get eaten by a humongous alien elephant super-villain, Bluric mentions "this is the second worst time I've been stuck in an elephant's mouth." We never find out what the first was.
  • Normal Fish in a Tiny Pond: Dumb by Galvan standards, geniuses by Earth standards. Or so people say.
  • Percussive Maintenance: Blukic fixes things by hitting them with a wrench. Surprisingly, this actually seems to be some of his most effective repair work.
  • Remember the New Guy: According to a flashback, they were active as Plumbers on Earth since Ben was eleven. Yet, no mention was ever made of them during the Alien Force/Ultimate Alien era.
  • Shorter Means Smarter: well... supposely at least.
  • Skewed Priorities: They apparently consider getting smoothies to be more important than possibly being demoted.
  • The Smart Guys: though Ben begs to differ.
  • Those Two Guys
  • Too Dumb to Live: Practically everything they do; they abandon the Plumbers during a major crisis to go get Smoothies, somehow repaired a Doomsday Device capable of destroying the Universe and build Galvan-sized doors in a base meant for humans and other alien species. It's practically a miracle they haven't been fired already for their incompetence.
  • Tuckerization: They are named after storyboard artists and directors Butch Lukic and Dan Riba.

Lucy Mann

Voiced by Tara Strong

Lucy is a Sludgepuppy, a species of shapeshifting sludge aliens, and Ben and Gwen's cousin-in-law. She is the cousin of Joel Tennyson's wife, Camille Mann.

  • Annoying Laugh: A snorting giggle
  • Ascended Extra: Only appeared once as a very minor character in the original series, in the episode Big Fat Alien Wedding (in fact, she had only two scenes that barely last two seconds, and wasn't even the main focus of said episode). In Omniverse, she's joined the Plumbers, being the first Sludgepuppy to do so, and gets a whole episode dedicated to her.
  • Catch Phrase: Psyche!
  • Cute Monster Girl: Played with in a more subtle way than the Original Show. In Big Fat Alien Wedding, Camille's evil mother had a classic monstrous Sludgepuppy form, while Camille herself had a more humanoid, attractive one. Lucy in Mud Thicker Than Water shows the ability to use both variants.
  • Eldritch Abomination: Lucy's full Sludgepuppy form, is a benevolent example.
  • Genki Girl
  • Red Herring: Mud is Thicker than Water is set up to make her seem like The Mole. In reality, she was a Reverse Mole hired to help discover the real mole, a Tetramand named Gorvan.
  • Shapeshifting: Apparently, Ben is not the only shapeshifter in the family.
  • The Reveal: Her being a Sludge Puppy in the original series as it easy to forget she came from the bride side of the family in addition to her short screen time. It's only until the end this was showcased when Ben ends up slipping on her sludge while trying to dance with her at the reception.
    • Troll: A Running Gag in "Mud is Thicker than Water" is pranking Gwen with her shapeshifting. "Psyche!"
  • Zettai Ryouki: Grade A in current Timeline.

Hobble

Voiced by Steve Blum

A cowardly insect-like alien, and member of the Plumber's Alpha Squad, who first appears in Vilgax Must Croak, and later joins Ben, Rook, and Rad Dudesman in their trip to the Anur System.

Scout

A Loboan Plumber operating on Anur Transyl, and one of Rook's former classmates. He serves as their ally during their visit on Anur Transyl in the Galactic Monster story arc.

The Plumber's Helpers

Cooper Daniels voiced by Cathy Cavadini (Original Series), Corey Padnos (Alien Force), Chris Pratt (Ultimate Alien)
Manny Armstrong voiced by Khary Payton
Helen Wheels voiced by Juliet Landau
Alan Albright voiced by Zeno Robinson
Pierce Wheels voiced by Adam Wylie

from left to right: Helen, Manny, Pierce and Alan

A group of alien Half-Human Hybrids assembled during Alien Force to face the Hightbreeds.

    Tetrax 

Tetrax Shard

Voiced by Dave Fennoy

One of the Bounty Hunters recruited by Vilgax to get the Omnitrix in season 1 of the Original Series. It however later turns out he was actually The Mole and wanted to make sure Vilgax didn't get the Omnitrix. Tetrax actually is a Petrosapien who once accidentally allowed Vilgax to destroy his native planet of Petropia after providing him with the Crystal required to power his weapon. He has then been fighting Vilgax as a way to atone for his crime.

  • The Atoner: he attempts to prevent Vilgax from getting his hands on destructive devices as a way to atone for being the one who provided Vilgax with the crystal that allowed him to destroy Petropia.
  • Badass: he proved more or less an acceptable match to the combined forces of Sixsix and Kraab, and practically Curb Stomped Diamondhead during their first encounter.
  • Beard of Evil: not himself, but his Evil Counterpart from Dimension 23 has one. Subverted in that Dimension 23 Tetrax isn't evil either.
  • Bounty Hunter: Initially, he also worked for Vilgax, but, he's decided to fight against him for what he did to his home planet. By now, he still is a bounty hunter, but he only works for those he consider honest hirers. He seems to work on regular basis for Azmuth.
  • Dark Is Not Evil: yes, the guy dressed in black armor with a helmet is a good guy.
  • Gemstone Assault: well, he is from Diamondhead's species, so yeah. Notably, his suit apparently is built so he won't have to remove it to use his powers.
  • Good Counterpart: to Sixsix in the original series.
  • Hover Board: He has one, which he gave to Ben later. He was also introduced with this as his production name.
  • Identical Stranger: to Diamondhead, especially since aliens of the same race can and often look different (except Highbreeds). Possibly justified considering he was supposely the Last of His Kind at this point, meaning his DNA was most likely used for Diamondhead.
  • It's All About Me: Used to follow this. It bits him in the arses hard, and he gave up on it after that.
  • Last of His Kind: By his own fault. At least until Petropia is restaured by Sugilite.
  • Reason You Suck Speech: delivers one to Ben at their first encounter, pointing out Ben's Leeroy Jenkins tendencies and his lack of strategy. Fortunately, Ben was smart enough to learn from this.
  • The Reveal: He wore a helmet hiding his face for most of his first appearance; it wasn't until the last minutes of the episode that he removed it and revealed himself as a Pretrosapiens.
    • It Was His Sled: By now, all fans are well-aware he is a Petrosapiens, and it's hard to not get the information from the fandom before you watch the episode.
  • Throw the Dog a Bone: His planet gets rebuilt with all its population resurrected in Secret of Chromastone thanks to a combination of Chromastone's powers and a failsafe inside the crystal.

    Xylene 

Xylene

Voiced by Grey DeLisle

The alien who was in charge of bringing the Omnitrix to Earth, and one of Max's old Love Interests. She was the one who unlocked Upchuck for Ben.

    Verdonna Tennyson 

Verdonna Tennyson

Voiced by Barbara Bain (as an adult), Juliet Landau (young and Anodite forms)

Max's wife, as well as Ben's and Gwen's grandmother. Verdonna is an Anodite, from a specie of alien, Mana-controlling Energy Beings. She is the one Gwen got her affinity with magic from.

  • Badass:
    • Badass Grandma: Literally; she is an actual grandmother, yet was able to handle both Ben, Kevin and later Gwen in a fight at the same time.
    • Badass in Distress: In her backstory, she was this when she met Max for the first time.
  • Blue and Orange Morality: She left her family when she found out none of her direct children had inherited Anodite powers, treated Gwen favorably over Ben because Ben was lacking said powers (though in her defense, she got better on this side), and attempted to destroy Gwen's body to turn her into an Anodite against her will (again, they managed to talk her out of it). She seems to see nothing wrong with all of this.
    • On the other hand, destroying Gwen's body is more or less just peeling a full-body mask off her (which is implied they can put back on).
  • Energy Being: Her real form.
  • I Was Quite a Looker: Her Anodite appearance hasn't changed, but her former human disguise was something to see.
  • Mana: She is made of that stuff.
  • Ninja Pirate Robot Zombie: She is an alien Energy Being with magic-based powers.
  • Rescue Romance: With Max.

    Jimmy Jones 

Jimmy Jones

Voiced by Scott Menville

A young Child Prodigy who is responsible exposing Ben's identity in Ultimate Alien. A big fan of Ben and his exploits, he was able to deduce after years of investigation that all alien forms were actually one single shapeshifting person. He then made the information public, assuming Ben would enjoy the fame. Though the team was initially unconfortable with this, Ben comes to befriend him, and frequently asks for his help into searching informations.

    Eunice 

Eunice (Unitrix)

Voiced by Molly Quinn

A mysterious girl met by Ben, Gwen and Kevin during vacation. She arrived on Earth in a spacepod, with no memory of who she was beside her name. Ben started developping an attraction to her, when it turned out she was being hunted by Sunder for unknown reasons. It's eventually revealed she was the Unitrix, a pre-Omnitrix prototype developped by Azmuth with the ability to absorb DNA from living beings and stock it inside itself. When arriving on Earth, she assimilated Gwen's DNA (the first person who touched her pod), causing her to turn into a female human. Sunder was actually sent by Azmuth to retrieve her after she had been missing. Though initially indending to turn her back into a device, Azmuth agreed, after a short argument with Ben, to keep her as an assitant instead.

    Ben's Parents 

Carl and Sandra Tennyson

Carl played by Dee Bradley Baker (Original Series, Destroy All Aliens), Don McManus (Race Against Time, Alien Force, Ultimate Alien)
Sandra played by Tara Strong (Original Series, Destroy All Aliens), Beth Littleford (Race Against Time, Alien Force, Ultimate Alien, Omniverse), Vyvam Pham ("Ben 10 Returns, Part 1")

  • Amazingly Embarrassing Parents: Invoked. They're the stereotypical Granola Couple.
  • Canon Immigrant: Added to the cartoon after debuting in Race Against Time.
  • Doting Parent: Both tend to do this, but Sandra arguably takes it a bit further.
  • Hidden Depths: In both the Original Series and Alien Force, it's mentionned Carl resents Max for neglecting the family in favour of Plumbers matter, and, when he learns about the Omnitrix, for involving Ben in it. He gets better.
  • Hippie Parents
  • Lethal Chef: Not really, but Ben doesn't like Sandra's cooking. Rook does, though.
  • Locked Out of the Loop: Excluding a non-canon episode from the Original Series, they didn't learn about Ben's superheroics until around the middle of Alien Force. They initially reacted badly, but eventually allow Ben's duties as a hero.
  • Obfuscating Stupidity

    Myaax 

Myaax

Voiced by Vanessa Marshall (Secret of the Omnitrix), Vyvam Pham (Alien Force)

A female Chimera Sui Genesis (Vilgax's species) who worked as Azmuth's assistant and helped him developping the Omnitrix. He refused to give her credit for it though, resulting in her taking her revenge by putting her own signature inside it instead of Azmuth's. During Secret of the Omnitrix, she is found in Incarceon by Ben, Gwen and Tetrax, and helps them find Azmuth. After the universe has been saved, she makes up with Azmuth and become his assistant again.

  • Berserk Button: She takes offense to being mistaken for Vilgax (plus she's a woman, so...)
  • Cthulhumanoid: Just look at her, though she won't drive you insane or anything like that.
  • Cute Monster Girl: Averted with her Original Series look. YMMV if the trope is played straight or not with her Alien Force look.
  • Genius Bruiser: she is a brillant enough scientist to be Azmuth's assistant; she also is from the same species than Vilgax.
  • My Species Doth Protest Too Much: Chimera Sui Genegis are supposed to be an aggressive, warrior species (proven in the Omniverse episode "Vilgax Must Croak"; they managed to repel a full-scale invasion of their homeworld by the Incurseans in a matter of hours). Myaax, on the other hand, is a self-admitted coward who rather avoids fighting whenever possible.
  • Lovable Coward: More than willing to let a ten-year-old do the fighting.
  • Progressively Prettier: When she was first introduced in Secret of the Omnitrix, she barely had any difference with Vilgax's original appearance, to the point Ben actually mistook her for him. When she shows up again as a cameo in the Alien Force finale, she has been redesigned to look slightly more feminine a more attractive.
  • Unwitting Pawn: Word of God revealed that she was the one who accepted Zs'Kayr's offer to provide her with DNA samples for the Omnitrix, allowing him to secretly put his own sample amongst them and resulting in Ghostfreak.

    Cash and JT 

Cash and JT

Cash Murray played by Dee Bradley Baker (Original Series), Tyler Patrick Jones (Race Aganist Time), Matt Levin (Alien Force, Ultimate Alien)
JT played by Adam Wylie (Original Series), Tyler Foden (Race Aganist Time), Yuri Lowenthal ("Ben 10 Returns, Part 1"), Scott Menville (Alien Force, Ultimate Alien)

A duo of bullies who used to bother Ben in the original series, typically by hanging him to trees. Once he got the Omnitrix, Ben developed a liking to give them a payback as Xlr8.

    Reinrassic III 

Reinrassic III (Reiny)

Voiced by Richard McGonagle

A Hightbreed lord who, following a fight around a portal, accidentally ended up stranded with Ben on a hostile desertic planet. With no other choice, the two had to team up to find their way home and survive. Though initially as racist and aggressive as the others of his kind, Reinrassic progressively befriended Ben, reaching a point where he lost his hand protecting him. Ben reattached it using Swampfire's regenerative abilities, but this altered Reinrassic's DNA in the process. This, plus the realization that he had been infected by Ben's human emotions, led Reinrassic to exile himself on the planet, feeling he would no longer be welcome among his people. He eventually came to realize this was actually a way to save his species, and returned his home world just in time to convince them not to commit mass suicide after Ben altered their DNA. Impressed by his lucidity, his people then named him Hightbreed Supreme, and he stopped the war, then concentrating his efforts in reintegrating his species to the universe.

  • Badass: was forced to team up with Ben on a planet where climate was weakening him (Hightbreeds survive better in cold climate) with limited supplies of water. He still survived. Even after Ben left, he still found a way to come back on his homeworld of his own.
  • Enemy Mine: with Ben. Unlike the usual example, it sticks.
  • Fantastic Racism: initially, like all Hightbreeds. He gets better.
  • Fire-Forged Friends: with Ben.
  • Humanity Is Infectious: his whole first appearance revolves around this trope; deconstructed when he decides to stay exiled because he feels like he was corrupted. Then reconstructed when he realizes the truth and convinces the other Hightbreeds of the error of their way.
  • I Choose to Stay
  • Literal-Minded: a minor case; he refers to Ben as Ben-Ben Tennyson due to Ben introducing himself as "Ben, Ben Tennyson". Other than that, he is perfectly able to understand expressions.
  • My Species Doth Protest Too Much: averted; when first introduced, he was as arrogant and racist as any other Hightbreed; it's only after befriending Ben that he became a better person. And when he came back on his planet, he successfully convinced his people to share his opinion.
  • Overly Long Name: his complete name is Reinrassic III, seventh son of the Noble Highbreed House of Deralla, direct descendant of the Pure Blooded High Order of Rarsect. Ben goes with just calling him Reiny.
  • Red Right Hand: inverted; after he lost his hand saving Ben from a local predator, Ben uses Swampfire's regenerative abilities to heal his wound, leaving him with a green hand... only he it's when they have befriended, so this is basically a sign he is a good guy.
  • Stab the Scorpion: How he saves Ben at one point in Alone Together.

    Argit 

Argit

Voiced by Alexander Polinsky

One of Kevin's friends and former partners-in-crime. Argit is an porcupine-like alien Con Man who is usually seen attempting to make profit from any situation he can find, though he usually is harmless enough to not be considered by the main cast as a threat. Though he frequently double-cross Kevin in their deal, Kevin still considers him as a friend and frequently talks with him.

  • Affably Evil: He always acts friendly toward both Kevin, Ben, Gwen and Rook when he sees them, but he usually won't hesitate to double-cross them if he can save his skin or make profit by doing so.
  • Barefoot Cartoon Alien
  • Bullying a Dragon: in "Andreas' Fault", he started trying to blackmail a Forever Knights castle with the help of Andreas. This worked for a short while due to the Diminishing Villain Threat they were suffering at the time, then a superior was sent to put some order...
  • Chronic Backstabbing Disorder: And how. Gwen describes him as "A con man who would sell his mother for lunch money" (According to Kevin's answer, he actually did it, and got a top price for her).
    • This becomes a point of Hypocritical Humor when he accuses the Incurseans for double-crossing him in bargaining for the Annihilarg.
  • Con Man
  • Cornered Rattlesnake: As he himself says, he's only a threat when he's backed against the wall.
  • Corrupt Corporate Executive/Villain with Good Publicity: In Omniverse, thanks to the fame he got from defeating a Way Bad during the Inkursean Invasion, he becomes a hero to the population of Undertown and creates his own enterprise, while still pursuing his illegal alien tech trade on a larger scale than before. He still remains fairly harmless though.
  • Crouching Moron, Hidden Badass: It was out of fear, but he did defeat one of Dr. Psychobos's mutant T'okustars by shooting all of his quills at it. He also defeated Albedo as Ultimate Spidermonkey.
  • Diminishing Villain Threat: in his first appearance, he was portrayed as an actual villain who, while not exactly a big threat, was still dangerous enough for Ben to require using Echo Echo against him. In all his following appearance, he was portrayed as more comical character who would fail anyway, to the point he can no longer be classified as an antagonist by now. See Harmless Villain.
  • Dirty Coward: He can and will fight if really forced to, but he is in no way a fighter, and will usually either try to run away as much as possible or just backstab his opponents, or just ask the Plumbers/the main cast for protection.
  • The Dog Bites Back: He constantly tricks and double-cross Kevin, while still trying to act like his friend. In Ultimate Alien, a psychotic Kevin starts chasing him to get revenge on all the times he double-crossed him by the past.
  • Even Evil Has Standards: In "The Ultimate Heist", he's not impressed when he hears that Rook has been trying to change Ben:
    Argit: Even I know you don't try to change a partner.
  • Harmless Villain: in-story, he is technically a criminal, but the protagonists leave him free both because he is a friend of Kevin and because he isn't much of a threat.
  • Hoist by His Own Petard: His plans have a bad tendency to systematically backfire on him.
  • Jerkass
    • Jerk with a Heart of Jerk: when Andreas apparently sacrifices himself to save him and the heroes, Argit appears to be honestly desperate... only to reveal he is actually mourning all the money he lost in the process. Kevin is not amused.
  • Karma Houdini: He constantly double-crosses Kevin and others, has manipulated poor Andreas into doing his bidding (and shows no true remorse when this apparently leads to Andreas' death), and betrayed the rebellion to the Inkurean invaders. The worst retribution he has ended up with was to be sent in prison a couple of times, only to be free again by the next episode. He never truly gets punished, and Kevin keeps trusting him. Even worse after Frogs of War, where he actually managed to pass himself as a hero and became famous and loved by Undertown's population.
  • Lovable Rogue/Lovable Traitor: he is a unscrupulous rogue who will betray everyone for his own benefit, but he gets away with that in the eyes of some fans due to being hilarious.
    • Though some parts still make him overlap with just being an obnoxious Jerk Ass, such as when he remorselessly manipulated Andreas to his own end or when he betrayed the rebellion to Attea during the Inkursean invasion.
  • Manipulative Bastard: Acted like one toward Andreas. Though not an especially competent one, and it's pretty clear it worked only because Andreas wasn't the smartest.
  • Not Quite Dead: An actual ability of his race; they possess the ability to temporarly stop their pulse to fake death. According to Ben, this is the only explanation to the fact such an obnoxious specie was able to survive that long.
  • Petting Zoo People: A hybrid rodent of sorts.
  • Pet the Dog: He actually tries to warn Ben about what will happen if he defeats Looma in "Many Happy Returns", but is silenced by Kevin.
    • In The Ultimate Heist, he saves Ben by defeating Albedo, even though he could have easily fled and left him to his fate. Granted, he still tries to make profit of it after that, but it's still worth noticing.
  • Prickly Porcupine
  • Rewarded as a Traitor Deserves: Gets on the receiving end of a non-lethal version in Frogs of War when he betrays the resistance to Attea.
  • Spike Shooter: Can launch spikes from his body, which are capable to knocking out whatever they hit.

    Baz-El 

Baz-El

Voiced by Rob Paulsen
The Galvanic Mecamorph who spawned Ship.

  • Asteroids Monster: Notably spawning a regular character, Ship.
  • British Accent
  • Jerk with a Heart of Gold: despite offering Ship to Ben and Julie in his first appearance, he attempts to take it back later just so he could get some credit for Ben's victory in the Hightbreed war. He however accepts to give up on him when he sees that Julie and Ship have bonded. Later, when Julie tries to give him Ship back because she fears it likes him more, he voluntary acts like a jerk so Ship will go back to her.
    • Jerk with a Heart of Jerk: In his third appearance, he was going to sell Ship on the black market, even though Ship is technically his son.
  • Too Dumb to Live: twice; in his second appearance, he recruited the Vreedle Brothers to bring Ship back alive. In his third appearance, while he is at the mercy of a bunch of fanatical alien mystics who accuse him to have profaned their sacred place, he outright tell them said sacred place is a mess to the point he thought it was just old ruins.
  • Small Role, Big Impact: See Asteroid Monster.

    Andromeda Five 

The Andromeda Five

Bivalvan voiced by Dee Bradley Baker
P'andor voiced by Dee Bradley Baker
Andreas voiced by Dee Bradley Baker
Ra'ad voiced by Dee Bradley Baker
Galapagus voiced by John DiMaggio

The Andromeda Five are, as suggested by their name, five alien of different species from the Andromeda Galaxy. All of them had in common that they possessed the powers Osmosian criminal Aggregor required to absorb in order to get the abilities he needed for his scheme. As a result, all of them were kidnapped by him so he could take them to his planet, where he would have use a machine to absorb them permanantly (instead of the usual temporary 10% of their actual powers). They succeeded in escaping during the travel, and ended up on Earth, where they splitted up so they could better escape to Aggregor. The first half of season 1 in Ultimate Alien focus on Ben's team trying to help them go back home, causing Ben to scan all of them in the process. They included:

    Kwarrel 

Kwarrel

An old Alien prisonner Kevin met during his time in Incarceon. Kwarrel played a major part in Kevin's life by taking him under his wings, helping him to turn back to his human form and learning him a safe way to use his power, such allowing him to go on the parth of redemption. Unfortunately, he died killed by prison guard Morgg while helping Kevin to escape the Null Void.

    Jennifer Nocturne 

Jennifer Nocturne

Voiced by Tara Platt

    Elena Valadis 

Elena Valadis

Played by Alyssa Diaz (Alien Swarm) Tia Texada (Ultimate Alien)

A character introduced in the Ben 10: Alien Swarm movie. Elena was one of Ben's Childhood Friends when he was 13, and Ben's first crush (apparently excluding Kai Green). She comes back during Alien Swarm, where it's revealed her father was a Plumber who studied the Hive's nanochip.

    Colonel Rozum 

Colonel Rozum

Voiced by John DiMaggio

A military officer first introduced in Ben 10: Ultimate Alien who serves as the protagonists' main contact with the Army over the course of the show.

  • Beneath the Mask: the few first times we see him, he is portrayed as a rather reasonable person by military standards in fiction, accepting the protagonists' help and fully cooperating with them (though he does display some more aggressive tendencies when he suggested to nuke the place where Aggregor was hiding). We only get to learn about his Knight Templar tendencies in Prisonner 775 is missing.
  • Broken Pedestal: seems to be this to Max when we find out about his Knight Templar tendencies.
  • Expy: of General Thunderbolt Ross, or at least his Expy General Eiling.
  • I Did What I Had to Do: his justification for what he did in Area 51.
  • Karma Houdini: he gets away with his imprisonment of aliens with nothing else than having his family threatened by one of his vindicative prisoners. To make things worst, this still wasn't enough for him to learn his lesson.
  • Knight Templar: He imprisoned over 700 alien in Area 51 because they "might" become a threat to Earth.
  • Reasonable Authority Figure: appears to be this at first; flashbacks suggest he might have been one to Max in his youth.
  • What the Hell, Hero?: Max calls him out on his actions in "Prisoner Number 775 is Missing".

    Professor Hokestar 

Professor Blarney Hokestar

Voiced by Charlie Adler

An alien Con Man introduced in Ben 10: Omniverse. Infamous but pretty harmless, Hokestar is constantly looking for a way to make profit through his inventions, usually with mixed results.

    Esther 

Esther

Voiced by Tara Platt

A character introduced in Ben 10: Omniverse. A hybrid of human and a specie of Rubber Man aliens known as the Kraaho that founded a village under Bellwood. Since Kraaho are from a volcanic planet, they were uncomfortable with Earth's climate, and attempted to use a nuclear device to change Earth's athmosphere and make it more appropriate for them. They didn't care what would happen to the everyone else. Esther disagreed and ended up helping Ben deal with them. By the end of the episode she elected their leader, thus ensuring they wouldn't try that again.

  • Action Girl: She was competent enough to give Ben a run for his money when he chased her.
  • Badass In Charge: After her first appearance, she is appointed The Leader of the Kraaho.
  • Challenging the Chief: This is how the Kraaho leader is elected but there doesn't have to be a formal challenge; Esther did so unintentionally. "The Kraaho Way is whatever you say it is."
  • Cute Monster Girl: Justified, since she is half-human.
  • The Cutie
  • Green-Skinned Space Babe: Ester is Ben's first mutual alien Love Interest. She also happens to look exactly like a human save for her light purple skin and her eyebrows.
  • Half-Human Hybrid: half-human, half-Kraaho.
  • Human Mom, Non-human Dad
  • Love Interest: To Ben, who she obviously has the hots for. "Rules of Engagement" reveals that Ben and Julie have broken up, leaving Esther as the most likely new love interest.
  • Official Couple: Played with; it's confirmed they have been on dates at least twice, and it is clear Esther considers their relationship as such. Ben, however, keeps insisting it was "just a movie" and is shown to be completely oblivious to any form of romantic advances Esther tries on him during their date.
  • Purple Eyes
  • Replacement Love Interest: She replaces Julie as Ben's Love Interest, though unlike Julie, they aren't explicitly stated to be in a relationship; Return to Forever and Catfight confirm they do go to watch movies together, but Ben constantly refuses to aknowledge they are more than friends, and any advance she tries goes completely unnoticed.
  • Rose-Haired Sweetie: Warm and passionate type.
  • Rubber Man: she got it from her Kraaho side.
  • Satellite Love Interest: Much like Julie, she has no major role beyond being Benís girlfriend; her one storyline is solved right in her first episode, and she never appears after that outside of episodes about Ben's love life.
  • Superpower Lottery: Full-blooded Kraaho require constant high temperatures to survive, such that they are living deep underground near a thermal vent and still need cold weather gear. Half-blooded Ester can move around the surface just fine with a warm jacket, and still has their Rubber Man powers.

    Mr. Baumann 

Mr. Baumann

Voiced by Richard Doyle (Ultimate Alien), Corey Burton (Omniverse)

Ben's next-door neighbor, and the owner of a local grocery store in Bellwood.

  • Ascended Extra: Appeared once in Ultimate Alien, hiding aliens from the Forever Knights. He appears more often in Omniverse (though with a completely different look and attitude).
  • Butt Monkey: When Pakmar isn't there to get his property damaged by Ben's Destructive Savior tendencies, Baumann is the one who get it in the face.
  • Characterization Marches On: He was friendly to Ben and his team in Ultimate Alien. In Omniverse, he's much more of a Jerkass, hating Ben for accidentally destroying his car and trashing his store while fighting aliens.
    • Even his appearance has completely changed. When first introduced, he look like this. Omniverse gives him the look shown on this page.
  • Cranky Neighbor
  • Disproportionate Retribution: Makes Ben pay off the damage to his car by doing deliveries, even though the damage was the result of an unprovoked alien attack.
  • Jerkass: Granted, Ben did wreck his car several times, but it always was an accident, and he apologized each time. However, a flashback involving the first time him and Ben met shows that he was never nice to Ben in the first place.
  • Pet the Dog: In Ultimate Alien he hides aliens from the forever Knights, in "Frogs of War" he hides the resistance in his basement.
  • The Precious, Precious Car: His store.
  • Too Dumb to Live: In T.G.I.S., he tries to prevent Ben from transforming and wrecking his store... while Dr Animo's minions are already wrecking his store, not to mention aggressing his customers.
  • Took a Level in Jerkass: In Omnivese
  • Ungrateful Bastard

    Pakmar 

Pakmar

Voiced by Tara Strong

An alien trader working in Bellwood who regularly becomes a victim of Ben's clumsiness.

  • Butt Monkey: When Baumann isn't there to fill the role. Meaning quite often.
  • The Chew Toy
  • Hair-Trigger Temper: Though in his defense, anyone would have this in his situation.
  • Long List: He produces a list of property damages that is at least ten feet long when bringing his grievances to Max Tennyson.
  • Oh Crap: His reaction practically every time Ben shows up. Biggest exemple being in "Showdown, Part 1":
    Pakmar: (recognizes Ben as Heatblast) Ben Tennyson?! NOOOOOOOOOOOOOOO! (tries to run away)
  • Massive Numbered Siblings: He has hundreds of children.
  • Properly Paranoid: He automatically assumes Ben will damage his property in some manner, and Ben never disappoints.
  • Recurring Extra: He has few to no relation to the plot of any episode he appears; most of the time he only is there to get his property accidentally damaged by Ben and remind us how clumsy Ben can be.
  • Spiteful Spit: Occasionally spits on the ground while talking to Ben. He does not like the kid.
  • Third-Person Person
  • Why Do You Keep Changing Jobs?: Each time he appears, he has a new business. Justified because Ben keeps ruining the last one.

    Pax 

Pax

Voiced by Eric Bauza

Pax is a Florauna (Wildvine's species), and an alien rights activist. He acts and dresses like a stereotypical hippie.

  • Animal Wrongs Group
  • Good Thing You Can Heal: He's graphically blown up twice (and gets his head bitten off once), but it's alright because he's just a plant creature, and he regenerates.
  • Green Thumb
  • Healing Factor
  • Hypocrite: Rook calls him out in his second appearance, he's concerned for the safety of the creature, but cares not for the other people in the ship who could be killed. He states that Pax put's the freedom of the creature over their freedom, when he's supposed to be fighting for everyone's rights. Pax didn't hear any of it because he was cleaning his ear(?), and wasn't paying attention.
  • Knight Templar: Wants to release dangerous and potentially deadly creatures at the cost of everyone's safety, believe he's doing the right thing, Ben states that's what makes him more dangerous.
  • New-Age Retro Hippie

    Zed 

Zed

Voiced by Paul Eiding

Zed is an Anubian Baskurr, and Khyber's former pet. After Khyber abandons her, she becomes Kevin's pet.

  • Canine Companion
  • Evil-Detecting Dog: In "Mystery, Incorporeal", she's shown to be suspicious of Dante. Turns out he's actually Michael Morningstar in disguise.
  • Heel-Face Turn
  • Loyal Animal Companion: Was this to Khyber, or so it seemed; she obeyed the sound of Khyber whistling, which Azmuth managed to use to turn her against him. Played straight after she becomes Kevin's pet.
  • No Name Given: Her name was not revealed until the credits of The Frogs of War. Khyber only saw her as a hunting tool, and didn't care about her enough to name her. She is finally referred to by name in For a Few Brains More.
  • Samus Is a Girl: Prior to the reveal, everyone assumed that she was a male, even Khyber himself. Kevin corrects Khyber on this in For a Few Brains More.
    Khyber: If you feed him, you'll dull his hunting instinct.
    Kevin: Zed's a girl, you jerk!
  • Satellite Character: Justified, as she's a non-sapient pet.
  • Shapeshifting: Used to be able to do this, thanks to the Nemetrix.
  • Team Pet
  • What Could Have Been: She was originally going to have a role in The Frogs of War, but her part was cut for time.

    Ben 23 

Ben 23

Voiced by Tara Strong

An alternate version of Ben, whose own version of Grandpa Max died shortly before he received the Omnitrix and who thus had to teach himself how to use it. Though still ultimately fashioning himself as a hero, without Max's guidance and teachings this Ben became even more self-centered, amoral and obnoxious than our Ben had ever been, and knows next to nothing about the aliens he meets or turns into, or even about the Omnitrix itself. A worldwide figure, entertainment mogul and hero to millions, he lived a comfortable life milking his heroism for personal gain before an interdimensional meeting with Ben put him on the right track.

  • Anti-Hero
  • Bystander Syndrome: Surprisingly. He doesn't lift a finger to help people being victimized by non-alien threats, because the press doesn't lap it up as they do when he fights titanic battles against aliens. Ben basically has to drag him into helping take down a bunch of bank robbers, and even so he takes so long trying to call his cameramen in to film the fight that he misses it entirely. What's worse, since the only villain he knows of is "The High Intellectuary" (actually Azmuth, trying to reclaim his Omnitrix), who specifically targets him, which means he only ever protects the public from threats that are only a threat to him in the first place.
  • Catch Phrase: "It's Gyro Time!" Also, calling his villains "haters."
  • Exactly What It Says on the Tin: He's not as good at naming his transformations as his counterpart. Examples include Freezelizard (Articguana), Electricyeti (Shocksquatch), Charcoal Man (Heatblast), and Plug Man (Feedback).
  • Fantastic Racism: Believes all aliens to be monsters, invaders or "haters." He gets better.
  • Fiction 500: He claims to be rich and influential enough to practically run Bellwood, which seems to be have weight in at least some respects.
  • Jerk with a Heart of Gold: He's obnoxious and sometimes seems to care only about his fame and his image - even at the expense of other people at times - but deep down he really does want to be a hero, and he genuinely respects and looks up to our Ben after meeting him. He is also legitimately receptive to Ben's advice, even when it goes against what he's built his image up to be - though he doesn't really let it sink in until after he nearly kills Azmuth and Ben has to get tough with him. By the end, he comes off more as a misguided kid than the all-out jerk he seems to be.
  • Lonely at the Top: Pointed out by his version of Azmuth when the two finally meet: Ben 23 has money, fame and the adoration of millions, but none of that holds a candle to having Grandpa Max with him - and he still misses him.
  • Miles Gloriosus: Exhibits many traits of this, though he is not a complete example. Though he is a competent and effective hero in his own right, he constantly exaggerates or even lies to make himself look better, particularly in front of his less accomplished but far more heroic alternate version.
  • Obliviously Amoral: Though he certainly wasn't above using the idea to make himself look good, he legitimately had no idea that not all aliens were evil. When Ben tells him so, he's amazed rather than disbelieving. After learning his lesson, he gradually becomes a much better person for it.
  • Stepford Smiler
  • Trademark Favorite Food: Gyros - literally, as his name is branded all over his favorite franchise. Though when asked about it he dismissively refers to Gyros as "yokel food," possibly implying that his love for them may be just another part of his image.
  • Unskilled, but Strong: Self taught with the Omnitrix, and as such lacks finesse in the way he uses his aliens - in favor of brute force.

     Rad Dudesman 

Voiced by Carlos Alazraqui

A mercenary and intergalactic smuggler, who will take on any job and transport any cargo so long as he's paid well.

  • Anti-Hero: Being a mercenary and smuggler, he'll work for anyone who pays him well enough.
  • Awesome McCoolname
  • Badass
  • Cool Ship: The Lovely Duck.
  • Disproportionate Retribution: Not talking to Ben, throwing Ben out the airlock, punching Ben in the face, all over Ben breaking a part and later using his ship to save his ass.
  • Early-Bird Cameo: Literally. He made a cameo in "Have I Got A Deal For You" before properly debuting in "Rad".
  • Expecting Someone Taller: When he's introduced to Ben, he says that he thought Ben would be taller. It's funny because Ben was Diamondhead at the time, and even in his human form, he's still much taller than Rad.
  • Expy: He's basically Han Solo as a duck.
  • Gatling Good: Pulls out some arm-mounted gatling lasers in "Rad Monster Party".
  • Killer Rabbit
  • Metaphor Is My Middle Name: In "Rad", he first claims that his middle name is trouble, then danger, then profit. Ben naturally doesn't buy it, and until Rook looks up some information on him, revealing that his full name really is "Captain Rad Profit Danger Trouble Dudesman".
  • Morally Ambiguous Ducktorate: For a duck, he's a tough and a scary smuggler.
  • Only in It for the Money: Rook tried appealing to his conscience, which didn't work. Then he threatened not to pay him, which did.
  • Petting Zoo Person: Aside from flying in "The Vampire Strikes Back", he doesn't really do anything duck-like.
  • Took a Level in Jerkass: In his first appearance, he was fairly easygoing and cool to get along with. In the Galactic Monsters arc however, he became cold hearted and uncaring, just because Ben fouled up once. When Ben had practical concerns like incomplete repairs or an Omnitrix that won't work without being within collection range of a new DNA sample, Rad doesn't care BS about it. Furthermore, he even cuts off Scout while he was thanking them on radio.
  • Ungrateful Bastard: After Ben saved everyone from Transyl's control, Rad punched him in the face (Because Ben had used The Lovely Duck to smash into Zs'Skayr's castle).
  • The Unintelligible: His ship's AI, Pyxi, who can only be understood by Rad himself, and Grey Matter.
  • Token Evil Teammate: He'll help the heroes when they need him, but he doesn't care for anyone but himself or money.

     Spanner 

Voiced by Scott Menville
A mysterious character who first appears, assisting Ben in "Something Zombozo This Way Comes".

Ben 10 Villains SpecialsCharacters/Ben 10     
Ben 10 VillainsCharacters/Western AnimationBetty Boop

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