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Characters: Ben 10 Main Characters
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    Ben Tennyson/Ben 10 

Benjamin "Ben" Kirby Tennyson (Ben 10)

Voiced by: Tara Strong (as a preteen), Yuri Lowenthal (as a teenager)

The main protagonist of the show. Initially a regular ten-year-old kid, Ben Tennyson happened to accidentally stumble upon the Omnitrix, a powerful watch-like alien device, which promptly attached to his wrist. After discovering that it allows him to turn into various alien creatures, each with their own set of powers, he quickly takes advantage of the situation by becoming a Super Hero, dealing with various human, alien, and supernatural threats. Though initially immature and unable to use his powers correctly, he gradually learns, eventually becoming a Living Legend and saving the universe several times.

All Series

  • All-Loving Hero: For all the jerkassery he is capable of, Ben always does his best to help and save people around him.
  • Ascended Fanboy
  • Badass: How much badass is Depending on the Writer, but here are some examples:
    • Badass Boast: Delivers a quite epic one to the Forever Knights in Ultimate Alien. It scares them into leaving:
      "Maybe you have forgotten something: I'm Ben Tennyson, wielder of the most powerful weapon in the universe. I stopped the Highbreed invasion, I defeated Vilgax in hand-to-hand combat, and I've beaten the Forever Knights more times than I can count. Here's what's going to happen: you're going to release these prisoners, you're going to crawl back to wherever you came from, and you're going to stop hunting down aliens because if you don't, I promise, you'll regret it for the rest of your very short lives."
    • Brought Down to Badass: On occasions, Ben has been separated from the Omnitrix, unable to use it or merely staying in human form. His ten-year-old self was still shown to be quite good using high-tech weapons, and his teenage self has acceptable fighting skills, at one point displaying enough agility and reflexes to disarm Manny while still in human form.
    • Crouching Moron, Hidden Badass: Initially more moron with badass moments, but he gets the badass part better as the story goes on.
    • Took a Level in Badass: He started out as an immature brat with a Hidden Heart of Gold and an overpowered weapon he barely had any control over; by the Alien Force/Ultimate Alien era, he has become a Living Legend who can intimidate a Forever King into obeying him with just one Badass Boast.
    • Future Badass: Ben 10,000 is a possible adult version of him. This Ben patrols the entire world, thus making mundane police obsolete.
  • Berserk Button: Trying to hurt any innocent people or anyone close to him. Then he will get serious and beat the crap out of you. God help you if you actually succeeded in harming someone...
  • Book Dumb
  • Brilliant, but Lazy: It's hinted several times that Ben is smarter than his attitude would suggest; he has an almost photographic memory, shows resources to adapt when the Omnitrix gives him the wrong alien, and can get an extremely good grade when he is working seriously at school. Khyber even admitted at one point he was a "smart kid."
  • Butt Monkey: In the original series, often as a result of his own actions. It stopped in the Alien Force/Ultimate Alien era, but for some reason, the writers decided to bring it back in Omniverse.
  • Catchphrase: ""Going Hero" in the original series/It's Hero Time!" Alien Force onwards. He also frequently says "Aw Man!" when a situation is bad.
  • Characterization Marches On: The original series portrayed him as a rather generic Bratty Half-Pint Idiot Hero with one big Chronic Hero Syndrome. Alien Force's first two seasons then matured him into a responsible leader with some Messianic Archetype tendencies and amplified his chronic hero syndrome; in season 3, the writers took the liberty of making him more like his younger, immature self... a little too much like his younger self. Fortunately, by Ultimate Alien, they moderate his competence and silliness as opposed to focusing on one or the other. Omniverse dials down the immaturity somewhat, and instead focuses more on the fact that he's been in this superhero business for years, and thus knows the ups, downs, lefts, and rights, likely to contrast him with Rook's heavy training but small experience in the field.
  • The Chosen One: By the Omnitrix.
    • The Unchosen One: By Azmuth until the finale of Ultimate Alien, where he finally admits Ben is worthy and gives him the final version of the Omnitrix.
  • Chronic Hero Syndrome: One of his most defining traits from the beginning of the show; even before he got the Omnitrix, Ben had an almost obssessive desire to help people around him whenever he can, sometimes at his own expense. This is why he Jumped at the Call when he got the Omnitrix. Partially deconstructed in the Alien Force/Ultimate Alien era, where it's shown he takes it so far he is unable to sacrifice anyone (except himself), even if it mean saving millions others. He will always try to find a better way if he can.
  • Civvie Spandex: Though he does call himself a superhero, Ben doesn't wear any special costume, instead merely using his regular clothes. Some of his aliens forms, on the other hand, wear costum made from his clothes in the Original Series and Omniverse.
  • Destructive Savior: Ben tends to cause massive destruction anytime he practices his super-heroics.
  • Didn't Think This Through: A notable character trait of him at first, something that many enemies took advantage of.
  • Green Eyes
  • Henshin Hero: Completed with a green flash and a Transformation Sequence for each alien form.
  • The Hero
  • I Shall Taunt You: Particularly in Omniverse.
  • Idiot Hero: Depending on the Writer; over the course of the franchise, he has been variably portrayed as truly stupid, only Book Dumb, perfectly capable of being smart but too immature to bother doing so most of the time or even sometimes as a borderline Cloud Cuckoo Lander. Alien Force portrayed him as rather smart and reasonable until his ego got the better of him, while most of Omniverse portrayed him as completely oblivious, hot-headed, impulsive and frequently stupid, if occasionally Genre Savvy.
  • Jerk with a Heart of Gold: He is immature, arrogant, can be quite a Jerkass at times, is not above using his powers for pranks and not unappreciating attention... but if people's lives are on the line, he will throw away everything to save them.
  • Keet
  • Leeroy Jenkins: Zig-Zagged; He tends to act like this sometimes and does get called out for his lack of thought. Other times he displays surprising cunning and a knack for outside-the-box thinking. Most importantly, he is good at adapting himself to the situation when the Omnitrix doesn't give him the form he intended to have.
  • Living Legend: Gradually becomes this over the course of the series. By Ommniverse, his exploits form a chapter and a half of required reading at the Plumber's Academy.
  • The Mind Is a Plaything of the Body: Though not clearly specified, it's implied Ben's personality changes according to the form he has. Most of them only cause relatively minor effects (Big Chill is a bit more of a Deadpan Snarker, Spider-Monkey is more excited, etc.), while others will lead to drastic change (Rath is a Hammy Leeroy Jenkins, Alien X has three personalities, and Ghostfreak can take over his mind if not careful). In "Frogs of War", his new Incursean form Bullfrag has an outspoken attraction for Princess Attea, which he blames on the DNA.
  • Ninja Pirate Robot Zombie: He is an Kid Super Hero capable of Voluntary Shapeshifting into various Aliens. Alien Force also makes him a honorary member of the Plumbers and reveals he has some alien blood himself (though not enough to make him significantly different than a regular human).
  • One-Man Army: Literally, as lampshaded in his dialogues with Alan:
    Alan: "Well, I guess you too are a monster..."
    Ben: "Well, technically, I am an army of monsters..."
    • Ben can only use one form at the time, but since most of his aliens are more than powerful enough to deal with entire armies it still counts.
    • His future self in the original series had the Omnitrix's master control unlocked (which let him change into any alien at any moment) and was so effective a crime-fighter he patrolled the entire planet using XLR8, leaving all police and other heroes obsolete. When younger Ben unlocked the control in another episode of the same series, he was able to take on Vilgax and Kevin and fight them equally despite their Villain Team-Up. Azmuth unlocked the master control again in the season one finale of Alien Force so Ben could take on the Highbreed and their army of DNAliens.
  • Papa Wolf: In the future, he's very protective of his son.
  • Secret Identity: In the original series and Alien Force; interestingly, this is one of the few cases of this trope that completely averts Clark Kenting; Most people thought those aliens creatures were either unrelated to each other or all part of a common team, and no one would suspect it was actually a shapeshifting kid; however, someone did figure it out eventually, leading to his identity becoming public knowledge in Ultimate Alien.
  • Super Hero: He is very insistent on being referred to as such.
  • Superpower Lottery: The Omnitrix provides Ben with the following abilities:
    • Voluntary Shapeshifting/Combo Platter Powers: His main ability provided by the Omnitrix is to turn into various alien creatures, each one with its own set of powers. He started out limited to ten forms (hence his surname), only to get more and more as the story goes on. By now, he is assumed to possess more than seventy forms.
      • His future self has 10,000 alien forms unlocked, and according to Azmuth, the maximum unlockable alien forms in the Alien Force era was of more than one million.
    • Healing Hands: With the Omnitrix's genetic-repair function. Lost during the Ultimate Alien era due to the Ultimatrix lacking this function. It's unknown if the new Omnitrix got the function again.
    • Translator Microbes: According to Word of God, this is the reason he is able to communicate with most alien species he meets and be understandable even in alien forms that should logically not be able to talk human language. Some of them however, like Sixsix or Wildmutt, possess a language too complex or bizarre to be translated.
    • Multiform Balance: With over 1,000,000 potential aliens with various powers, he could handle any imaginable situation. Theoretically, anyway, thanks to the Omintrix's tendency to be uncooperative and his own reliance on the Indy Ploy above planning.
      • Both Ben 10,000's have a variation of this, the original series version having the Master Control and the Ultimate Ben10K able to use the powers of all his aliens without changing his human form.
  • Trademark Favorite Food: As a teenager, he has a fondness for smoothies and to a minor extent chili fries. Ironically, Omniverse reveals he hated smoothies as a preteen before he gained a taste for them with age.
    • In "A Flash From the Past", when Rook asks whether they should go out for celebratory smoothies, Ben notes that smoothies are for the day time and chili fries are at night.
  • Transformation Name Announcement: Mainly in Alien Force and Ultimate Alien, though it does pop up on occasion before or after, such as during "Of Predators and Prey" in Omniverse, after transforming into Humungousaur for the first time after many attempts.
  • True Companions: Himself, Gwen and Grandpa Max in the original. Himself, Gwen and Kevin in Alien Force and Ultimate Alien. Himself and Rook in Omniverse.
  • Weirdness Magnet
  • You Are Not Alone: In Alien Force his Grandpa tells him that Ben cannot go about being a hero alone, and that he needs to put together a team.
    • This is eventually defied in the episode "Of Predators And Prey: Part 1", where Ben dumps Rook as a partner. To make matters worse, he gets captured by Khyber in the end. Then it's revealed that Ben and Rook planned this all along and only pretended to argue with one another (although Rook didn't catch that part when he went into his "The Reason You Suck" Speech).
  • You Are Better Than You Think You Are: Gwen gives him a pep talk that amounts to this after he loses the Omnitrix.
    Gwen: What about all those times you saved Grandpa? Or me? Or lots of other people when you weren't an alien? You're still a hero, even if you can't go hero!

Original Series

  • Acquired Situational Narcissism: Suffers this on occasion.
  • Aesop Amnesia: Even lampshaded in Destroy All Aliens:
    Ben: "I have learned my lesson."
    Gwen: "You will forget it again, but you learned..."
  • Bratty Half-Pint: A heroic example.
  • Comes Great Responsibility: Averted; despite his strong will to help and protect people, Ben would use his powers for personal gain on amusement at any moment (getting revenge on bullies, cheating at games, even once stealing video games), though this often led to the worst possible result, and he draws a line at doing anything that would actually hurt/kill people.
  • Dude, Where's My Respect?: His heroics were rarely if ever recognized or acknowledged even by those in on the Masquerade. Later averted in the sequels.
  • Future Me Scares Me: Though initially in awe of Ben 10,000, he later calls him on being a Jerkass. Ben 10,000, meanwhile, has a case of I Hate Past Me.
  • How Do I Shot Web?: Ben initially had a hard time learning how to use the Omnitrix by his own, even causing his first transformation by accident. In the original show, he was able to activate the transformations, but would easily pick up the wrong alien and couldn't decide when he would turn back to normal, forcing him to wait for the time limit to be reached. By Alien Force however, he has learned how to switch between aliens and turn back to normal of his own.
    • He has a difficult learning curve when he just obtains a new alien, such as with Cannonbolt. It was downplayed for Alien Force and Ultimate Alien, with Ben figuring out how to use most of the aliens rather fast. Omniverse brings back the learning curve a bit, having problems with Bloxx and Gravattack at first (especially with the latter, due to the fact he had difficulties figuring out what Gravattack could do).
  • Jumped at the Call: He provides the page's quote. Ben loves possessing the Omnitrix and acting as a hero, both because of the thrill of adventure and because it allows him to help people.
  • Kid Hero
  • The McCoy
  • Mouthy Kid
  • Red Oni, Blue Oni: Red to Gwen's Blue.
  • Screw the Rules, I Have Supernatural Powers!: As a kid, he was a rare heroic example; less so as a teenager, though he is still willing to do it if it overlaps with Screw the Rules, I'm Doing What's Right.
  • Survivor Guilt: Ben suffers from this briefly during the original series story "Secret of the Omnitrix" after he thinks that Gwen was killed after being grabbed by an wild Florauna. Don't worry, she got better.
  • Taught by Experience
  • This Loser Is You: The show does everything it can to portray him as immature, unlucky, unpopular at school and generally not bright or talented, especially compared to his much more precocious cousin Gwen. Fortunately toned down in the sequels (it comes back a bit in Omniverse, but it's nowhere near the same level than in the original show.)
  • Why Did It Have to Be Snakes?: Had a fear of clowns when he was younger. He got over it in one of the coolest ways imaginable. Unfortunately, this fear relapsed in Omniverse.
  • Wouldn't Hit a Girl: Played with in one episode; he is reluctant to fight Rojo's gang when he finds out they are girls, because "heroes don't hit girls". Later in the episode, Gwen tries to take advantage on this to hit him. He has no problem hitting back because he is not in hero form at this point.

Alien Force & Ultimate Alien

  • Acquired Situational Narcissism: Taken Up to Eleven in season 3 of Alien Force. In Ultimate Alien's first season finale he cops to this. A special case in that there is no Reset Button.
  • Beware the Nice Ones: Even though he sometimes acts a bit egocentric and immature, Ben is still a nice, kind-hearted, and deeply altruistic guy. But push his Berserk Button, and you will regret it. Captain Nemesis, Aggregor and Discroll found out the hard way.
    • This is especially visible in Ultimate Alien, where it's shown at several points that Ben, when pushed too far, can become downright brutal. The whole point of the show seemed to have Ben struggling to not become a Knight Templar.
  • Combat Medic: One of the Omnitrix's lesser known powers, revealed in Alien Force, is its ability to repair the damaged DNA of other creatures near its owner. Ben used this to turn the DNAliens back into full human beings, and he also eventually used it on the Highbreed themselves to repair the damage they'd caused by centuries of inbreeding.
  • Cool Car: Has one in Alien Force and Ultimate Alien.
  • Famed in Story: To the alien underground in Alien Force, then amongst humans as well in Ultimate Alien.
  • Funny Schizophrenia: "Ultimate Sacrifice."
  • Genre Savvy: Depending on the episode, but being a superhero fan to begin with, he has his moments:
    • Though he initially believes Simian's fake Warrior Prince story, he starts having suspicions at the very first clue, and ends up Out-Gambitting him.
    • When Captain Nemesis challenged him to come and fight him while using kidnapped Julie and Jennifer for a Sadistic Choice, he has Gwen and Kevin coming with him in secret so they can save the girl he won't be able to save of his own.
    • In "Ultimate Power", he is lucid enough to keep one of his Echo Echo clones hidden in his car while the others goes to fight Kevin. Later in the same episode, he anticipates Darkstar's Chronic Backstabbing Disorder and instructs Cooper into preparing in consequence.
    • In "The Ultimate Enemy", he immediately deduces that Vilgax would never submit to Diagon unless he has something in his sleeve. He is right.
  • Good Is Not Dumb: Even taking the infamous season 3 in account, Alien Force/Ultimate Alien was by far the era where Ben was the smartest.
  • Half-Human Hybrid: 1/4 Anodite, although he doesn't have the powers of such. Anodites don't have DNA, so genetically, he and Gwen are full human.
  • Hero with Bad Publicity: In Ultimate Alien, thanks to Harrangue's campaign against him. Though only with most adults; teens and younger kids (and a few adults) seem to think he's absolutely awesome.
  • Hidden Depths: In Ultimate Alien, it is suggested that the whole Idiot Hero act and constant one-liners as a kid were a coping mechanism so he could deal with having to make life-and-death decisions on a more or less daily basis.
  • I Hate Past Me: "Hate"'s a strong word, but teen Ben found his 10 year old self to be quite annoying.
  • Jerkass Fašade: In The Forge of Creation, it's stated that the reason Ben acts so arrogant (or at least part of it) is because he's afraid, and it's his way of coping with the stress of being a hero.
  • The Kirk
  • The Knights Who Say Squee: Toward Captain Nemesis. It doesn't end well.
  • Mid-Season Upgrade: Ben 10,000 gives Ben all of his locked aliens that he'd used up to that point along with some new ones in the middle of Ultimate Alien's second season. He also brought back Swampfire and Waybig after the two were eroded into dust by Eon.
  • Older and Wiser: Significantly smarter and wiser than his 10 years old counterpart. He is still a kid at heart, but he actually listens to advices, accepts others' help, thinks before acting and is less likely to suffer Aesop Amnesia. At least until season 3...
  • OOC Is Serious Business: Max knows things are bad when Ben attempts to find and kill Ax-Crazy Kevin in the Ultimate Alien season 1 finale without even trying to find a way to cure him of his insanity.
  • Pride: Deconstructed. By the first season finale of Ultimate Alien, he outright states that he's grown tired of what comes along with his fame. In fact, his constant pestering due to fame and time it took up was revealed to be a major factor for his relationship with Julie taking a big hit.
  • Red Oni, Blue Oni: Blue to Kevin's Red.
  • Super Dickery: Season 3 of Alien Force had a whole episode with the Plumber's Helpers attempting to stop an apparently psychotic Ben from killing them and Max while they were trapped on a space station. Of course, it turns out he was just acting like he had gone rogue as part of a test pulled out by Max for the Helpers, but Ben was still scarily good at acting evil.
  • Took a Level in Dumbass: In season 3 of Alien Force the writers tried Pandering to the Fanbase in a failed attempt to make him more like his 10 years old self, and he started acting more narcissistic and cocky again. Partially justified in-universe in that saving the Universe went over his head, but it sticks far longer than it should. This was then zig-zagged in Ultimate Alien.
  • Took a Level in Jerkass: In the third season of Alien Force, due to letting his hero status getting the best of him.


  • Aesop Amnesia: Around half of what he learnt over the course of the previous sequels have been completely forgotten here.
    • Example: Something This Way Comes Zombozo, where not only does Ben forget he already overcame his fear of clowns in the Original Show, but the episode ends with him falling into it again, and he doesn't even overcome it a second time.
  • Arbitrary Scepticism: Doubts the existence of Chupacabras in T.G.I.S., even though his Universe includes not only aliens, but also magic, mad scientists, mutants and he has himself been at least twice in an alternate universe at this point.
  • Belligerent Sexual Tension: He and Kai had this dynamic in "An American Benwolf in London."
  • Big Brother Mentor: Debatably his position toward Rook in Omniverse, in the sense he is The Leader and the more experienced of the two. Though he is still reluctant to admit it.
  • Cat Smile
  • Chick Magnet: Lampshaded in Rules of Engagement:
    Julie: "Just how many girls are in your life?"
    Ben: "At this point, I haven't got a clue!"
  • Cool Bike: The Tenn-Speed, which he built as Jury Rigg using parts from Rook's truck.
  • Deadpan Snarker: When teamed up with Rook, which leads to Hilarity Ensues since Rook Does Not Understand Sarcasm.
  • Defrosting Ice King: Toward Rook; lampshaded by Rath:
  • Eleventh Hour Superpower: In "Showdown: Part 2", Ben is finally able to transform into Feedback again, 5 years after Malware destroyed the form.
  • Famed in Story: By the time of Omniverse, there is a chapter and a half of required study about him at the Plumber Academy.
  • Flanderization: The obnoxious, immature and narcissic tendencies of his Alien Force self in season 3 are amplified here, with his Butt Monkey status from the Original Show brought back to boot.
  • Genre Savvy: Uses terms like Big Bad, and in Rad Monster Party, he knows that his friends are being kidnapped, and refers to it as a "horror movie trope".
  • Nightmare Fetishist: He says that the College Gwen goes to, Friedkin University, is a creepy place and says that this is awesome, saying he's gonna go there. Amusingly, this episode comes right after his fear of clowns returns. He also liked Anur Transyl, saying that a town composed of monsters is cool.
  • Oblivious to Love: Completely fails to notice any of Esther's romantic advances on him. Rayona notes that he has no knowledge of earthling courting rituals.
  • Red Oni, Blue Oni: Red to Rook's Blue.
  • She Is Not My Girlfriend: No matter how many times Rook points it out, he constantly refuses to acknowledge Esther has the hot for him and their relationship is more than Just Friends.
    • Also had this reaction when people (notably Rook and Chadwick) make references to the Belligerent Sexual Tension between him and Kai.
  • Took a Level in Dumbass: Taken to Flanderization levels on both his teenage self and his 10-year old self, making them both much more bumbling, clumsy and immature while removing a large amount of his badassery from Alien Force. He does have occasional Genre Savvy moments, but for the most part, he makes his Original Series self look like a genius.
  • Took a Level in Jerkass: Happens to his 10 years old self in Omniverse, whose obnoxious Bratty Half-Pint characterizations are taken Up to Eleven compared to the original show.
    • To an extent, there are episodes in Omniverse as well where Ben can be a bigger jerk than he ever was in Alien Force, such as taking credit for one of Rook's ideas, inexplicably treating Jimmy Jones like The Load, mocking his enemies or being generally uncaring of the damages he causes in inhabited areas. His Chronic Hero Syndrome also tends to be very toned down compared to the previous installments; in the Galactic Monster story arcs, he shows little concern about taking care of Zs'Skayr, and was even going to leave Anur Transyl with him still on the run.
  • Unwanted Harem: Gains one over the course of Omniverse to compensate for the fact that the writers decided to end the relationship between him and Julie in this series. At least four women develop feelings for Ben. Whether Julie is still part of the harem or not is yet to be seen, but they're still considered friends based on how her one Omniverse appearance went.
  • Would Hit a Girl: He has absolutely zero scrupple busting out Cannonbolt and then Gravattack on Attea and Eighteight in "Vilgax Must Croak".

    Gwen Tennyson 

Gwendolyn "Gwen" Tennyson (Lucky Girl)

Voiced by: Meagan Smith (as a preteen, Original Series, Destroy All Aliens), Ashley Johnson (as a kid, Omniverse; as a teenager)

Ben's cousin and original sidekick. Despite being the same age of him, Gwen is a Child Prodigy surprisingly mature and smart for her age, mastering various classes as school and with some practice in martial arts. Her snarking, rationnal personnality often clashed with Ben's, causing their relationship to be extremely conflictual (sometimes to... disturbing level for cousins). Eventually, she calmed down as Ben matured and they ended up with a more affectionate relationship. Though she initially had no power of her own, Gwen happened to discovere herself aptitudes for magic over the course of her adventures with Ben, eventually stealing a spellbook from Charmcaster and using it to improve herself. It was later revealed her magic skills came from her grandmother Verdonna, who was a Mana-manipulating Energy Being from an alien specie known as the Anodites.

Original Series

Alien Force & Ultimate Alien


  • Bare Your Midriff: In her Anodite form.
  • Clark Kenting: As Lucky Girl.
  • Clingy Jealous Girl: Defied; when she learns the details about Kevin being engaged with Princess Looma, she actually feels sorry for Looma and blames Kevin for playing her just for a piece of his car.
  • Demoted to Extra: Not as much as Kevin, but this only applies to some episodes involving present day Gwen.
  • Flanderization: Moreso than in Alien Force season 3, making her more moody.
  • Insistent Terminology: Prefers to be called by her full name, Gwendolyn, whenever she is attending college.
  • Meganekko
  • Magic Skirt She once jumped and fell leg first into a crater, and her skirt stayed right in place.
  • Mind over Matter: She regains the Charm of Bezel that gives the user telekinesis.
  • Put on a Bus: In the first episode, along with Kevin. She leaves for college, and Kevin goes to live near her.
    • Not as You Know Them: When she comes back, she's gotten a haircut, wears glasses, and wears a shirt closer to the one she wore as a child.
  • Secret Identity: "Mystery, Incorporeal" shows that she's still fighting crime as Lucky Girl, and is trying to keep her identity secret. However, she does publicly use her abilities as Gwen, but Lucky Girl serves more of as a Second Super-Identity.
  • Teen Genius: Goes to college early in the first episode and takes Kevin with her.
  • Took a Level in Jerkass: Moreso than in Alien Force season 3. Her jealousy toward Ben gets more emphasis, she is much more likely to get angry and threaten to hurt either Ben or Kevin (she throws them off a flying ship in Showdown, though this was played for comedy), and Mud is Thicker Than Water retcons her in having a borderline Irrational Hatred of her cousin Lucy (though thanksfully she gets better by the end of the episode)
  • Youthful Freckles: Both her 11-year old and 16 year old designs in Omniverse.
  • Zettai Ryouiki: Grade C.

    Kevin Levin 

Kevin Ethan Levin (formerly Kevin 11)

Kevin was originally a street troublemaker kid with the ability to absorb energy, who got regularly bullied and considered as a freak. Following a short-lived partnership with Ben he accidentally absorbed energy from the Omnitrix, causing him to mimic Ben's shapeshifting powers, but eventually lost control of them, causing him to end up trapt in the form of a grotesque, chaotic amalgam of Ben's ten original aliens. Blaming Ben for this, he went on a vendetta against him and dedicated himself to try to kill him, only to eventually end up trapped in the Null Void. Following the Time Skip between the original series and Alien Force, Kevin eventually recovered from his psychosis and mutation while in prison, and was able to go back to Earth where he starts working as a Con Man. Events led him to meet with Ben again and be forced to team up with him. Despite a harsh beginning, the two eventually reconcile, and Kevin becomes a valuable ally as well as Gwen's Love Interest.

For tropes relating to him as Kevin 11 in the original series, visit the Ben 10 Villains page.

Alien Force & Ultimate Alien

  • Anti-Hero: Slides between Type II and Type III constantly. On rare occasion (like when dealing with Ragnarok), he goes Type IV.
  • Arbitrary Scepticism: Despite living in a world with aliens, Kevin doesn't believe in magic, and keeps saying Gwen's powers come from alien bloodline. He is partially right.
  • The Atoner
  • The Big Guy
  • Body Horror: Suffers from this 3 times in the series as a result of being exposed to the Omnitrix's energy. (1st in the original series, 2nd in Alien Force, and 3rd in Ultimate Alien.) He manages to revert back to normal as each series progresses.
  • Book Dumb: Plays at this, but is in fact not. Gwen notes that he's good at math and a top-notch engineer, as well as having a knowledge of history. It helps that he literally hasn't gone to school since the age of 11, and most of what he knows he learned on the streets by doing rather than from books by studying. However, some terms like "Sacrelige" confuse him.
  • Cool Car: With a load of Plumber tech in it to boot.
  • Dark Is Not Evil: Starting with Alien Force, he turns into the latter as part of his Heel-Face Turn.
  • Deadpan Snarker
  • Disappeared Dad: Devin Levin. KIA, courtesy of Ragnarok.
  • Distressed Dude: He tends to suffer this on occasion due to now being the weakest of the group.
  • Ditzy Genius: While being an expert in mechanics and alien tech, he's clueless and naive when it comes to subjects here on Earth.
  • Freak Out: When he's transformed again in Alien Force after he and Ben (unsuccessfully) attempted to hack the Omnitrix. And once more in Ultimate Alien after absorbing the aliens in the Ultimatrix.
  • Genius Bruiser: While weaker than both Gwen and Ben, he is still the most muscular of them, and his powers grant him access to Super Strength as well as increased durability. He also happens to be an expert in mechanics and alien tech.
  • Half-Human Hybrid: Half human, half Osmosian. Notably, this is a Retcon. Word of God is that the creators of the original series intended for him to be a mutant.
  • Heel-Face Revolving Door: Went from neutral to evil shortly before his debut, turned good at the start of Alien Force, turned evil again 3/4 through Ultimate Alien's first season, then reverted back to good in the Season Finale.
  • Heroic Sacrifice: Non-fatal example. He saves the universe and defeats Aggregor, but at the cost of his sanity.
  • Heroic Willpower: A flashback in Ultimate Alien reveals he had to concentrate to get back to normal from his transformation in the original series.
  • If You Kill Him, You Will Be Just Like Him: "Vendetta". He doesn't listen. Not that Ragnarok didn't deserve it, though.
  • Indy Ploy
  • Jerk with a Heart of Gold
  • Long-Haired Pretty Boy: His hair reaches his shoulders. By Omniverse, it's a full-blown mullet.
  • Loveable Rogue: In Alien Force and Ultimate Alien.
  • The McCoy
  • Missing Mom: Until near the end of Alien Force.
  • My Name Is Kevin Ethan Levin. You Killed My Father. Prepare to Die: Quoted verbatim. Then invoked a second time in Ultimate Alien for his old mentor Kwarrel.
  • Pay Evil unto Evil: Ragnarok.
  • Red Oni, Blue Oni: Red to Ben's blue. With regards to Gwen, he's still the red one.
  • Redemption Demotion/Redemption Promotion: Both at once! While not as badass as he used to be, he's become smarter during the Time Skip and continues to show it as he spends more time with Ben and Gwen. This especially shows halfway through Ultimate Alien's first season.
  • Reformed Criminal: Mostly. By his own admission, he's not entirely trustworthy — and a lot of the tech he has in the back of his ride is stolen. Though in his defense, most of the ones he stole from were enemies they were fighting.
  • The Resenter: When he goes insane again after absorbing the Ultimatrix's power Kevin reveals a great deal of resentment towards Ben. Ben always beat him when they were kids, Ben becomes a world famous superhero while Kevin gets turned into a monster, Ben gets a happy's always Ben who gets everything. It's not really made clear how much of this is just the energy-driven insanity speaking and how much of it is real.
  • Roaring Rampage of Revenge: After being driven insane in Ultimate Alien he decides to go on one of these whenever he's not absorbing other people's powers.
  • Running Gag: His Precious Precious Car keeps on getting destroyed.
    • "Not my ride!"
    • Omniverse lampshades and justifies it by revealing the reason he was still able to always repair his car despite all the wrecking it took is because he used an indestructible piece of Tetramand tech he got from his engagement with Princess Looma.
  • Same Character, But Different: When first appearing in Alien Force.
  • Slasher Smile: When he's re-corrupted with energy in Ultimate Alien, these return.
  • Shape Shifter Mode Lock: Throughout most of Alien Force's third season.
  • Super Power Lottery:
    • Energy Absorption: His original power. Read the spoilers and you'll understand why he never uses it again after the original series.
      • Combo Platter Powers: Absorbing energy from an alien will cause him to gain some of the alien's characteristics and powers. When absorbing energy directly from the Omnitrix, he will eventually turn into a monstrous, chaotic amalgam of several aliens.
      • Voluntary Shapeshifting: Initially, when he absorbed energy from the Omnitrix the first time. Didn't last however...
      • All Your Powers Combined: He at first had Ben's ability to transform, but after getting frustrated with Ben just giving up on him, he turns into an amalgamation of the original ten aliens.
    • Extra Ore Dinary/Chrome Champion: Capable of turning his body into various metals and/or solid materials that he touches, due to being part Osmosian. Ultimate Alien reveals he learned this from Quarrel.
      • Rubber Man: He once turned his body rubber after touching the tires of his car.
      • Midseason Upgrade: Gets shapeshifting powers in The Vengeance Of Vilgax which make him stronger, which he retains even after being restored to human form. Made a plot point in that if he hadn't got them, they'd have been unable to save the world from Hex. This really helps increase his usefulness to the team.
  • Tall, Dark and Handsome
  • Tall, Dark and Snarky
  • Teens Are Monsters: Inverted, he was evil as a child, but turned good after turn into a teenager.
  • Token Evil Teammate: Starts out as this in Alien Force, and becomes more of this in Omniverse.
  • Tritagonist
  • Troubled, but Cute
  • Tsundere: Type A.
  • Wicked Stepfather: Kevin implied to have had one in his youth. It turns out to be a completely false viewpoint of Kevin when he's insane; his stepfather is actually a good man.
  • With Great Power Comes Great Insanity: Used in Ultimate Alien to rectify his extreme change in character as a kid. He falls off the proverbial wagon again later on.
  • The Worf Effect: He's usually always the one who gets his ass kicked the most in battle.


  • Anti-Hero: Still one, but now can edge into Type V territory.
  • Demoted to Extra: Even when he does come back, he usually accomplishes even less than his Alien Force/Ultimate Alien self. For exemple, in Showdown, his role in the whole episode consists in... befriending Khyber's pet.
  • Didn't Think This Through: In "OTTO Motives" both his car and Rook's truck got totaled in the fight between Ben and Villain of the Week OTTO, who stole Warlord Gar's collection of the most valuable cars in the galaxy. As a sign of gratitude for saving the collection, Gar gave the car of his choise to Kevin, who chose the one made of solid taydenite. As he explained later he planned to sell it, so both he and Rook could rebuild their own rides. However, as Ben pointed it out, it'll be very hard to find a buyer for something that expensive.
  • Never My Fault: Seems to have developed this problem again. When Looma first shows up, he makes up many excuses as to why he bailed on her before finally just saying "It wasn't my fault!" Even by the end of the episode, he hasn't learned any better.
  • No Yay: In-universe, this is his reaction to seeing Bullfrag flirting with Attea.
  • Put on a Bus: In the first episode, Gwen leaves for college, and he leaves to live near the campus.
    • Not as You Know Them: When he comes back, he now has a stubble, paler skin, some alterations in his outfit like dark stripes along his sleeves, and a shadier, more unpleasant attitude toward Ben and Rook.
  • Took a Level in Dumbass: It's not as bad as Ben, but still, he is portrayed as even less thinking his actions through and with a chance of his schemes backfiring that rivals Argit. He also is the only one who fails to guess that Bullfrag is Ben in Frogs of War.
  • Took a Level in Jerkass: Possibly, in an attempt of Character Rerailment, portrays him as more of jerk by revealing his backstory with Princess Looma and having him pulling out a Batman Gambit to get rid of her by giving her to Ben. Even Argit seems to think he exaggerates.

    Rook Blonko 

Rook Blonko

Voiced by: Bumper Robinson

Ben's new partner in Ben 10: Omniverse. A Revonnahgander from Revonnah recently integrated in the Plumbers and sent by Max to team up with him after Kevin and Gwen had to leave Bellwood. A skilled, if inexperienced Plumber, Rook has been impressed by the legends around Ben's heroic accomplishments, and came to Earth partially to see if the boy lived up to the legend. Despite being an alien, he possess no special powers, instead relying on his skills, training, intelligence and a device called the Proto-tool that can transform into various weapons and equipment.

  • Adorkable: While he is a impressively effective fighter, he is socially awkward due to his lack of knowledge of Earth's customs and not understanding sarcasm.
  • Arbitrary Skepticism: Despite being an alien in a world with various alien species running around, high-tech weapons and many other things, he believes Alien X is nothing more than a legend. He does see him in "So Long and Thanks For The Smoothies?" but his memory got erased when Alien X had to recreate the whole universe.
  • Ascended Fanboy: He admires Ben; his personal reason for coming was to see if Ben lived up to the legend.
    • Because of this, when Albedo swaps places with Ben and appears to be taking Rook's advice, he wanted so badly to believe that is really was Ben that he never questioned him being an imposter, letting Albedo do as he pleased and keeping the real Ben in plumber prison as a result.
  • Badass: When first introduced, he neutralizes three alien criminals of his own with almost zero effort.
    • Badass Normal: Unlike most alien species in the series, he lacks any ability that could be considered a super-power by human standards, and relies solely on his tech and Plumber training. Doesn't stop him from kicking ass.
    • Badass Bookworm: He is extremely well read and knowledgeable about galactic history, science, and technology.
  • Bash Brothers: With Ben. The episode title Bros In Space lampshades it.
  • Berserk Button: As see in "So Long, and Thanks for the Smoothies?", seeing the Vreedle Brothers makes him pissed due to the fact that the two destroyed the Plumbers Academy and forced him to take his final exam in a space trailer.
    • Extended time around Pax is shown to irritate him to an unrook like degree.
    Rook: I am suppressing a very strong urge to knock you out!
  • Beware the Nice Ones: While polite and considerate, he is still a highly trained law-enforcement officer armed with some of the best equipment in the galaxy. He also has some Berserk Buttons you don't want to press.
  • Big Damn Heroes: A champion at this. Lampshaded in "Of Predators and Prey"
  • By-the-Book Cop: Rook is described as "all training no experience". He also treated Ben as a superior rather than like a friend when they first met, acting respectful toward him and calling him "Sir", until Ben asked him to just call him Ben. However, unlike the usual exemple, he is less experienced than Ben.
  • Captain Obvious: Tends to point out obvious things to Ben quite frequently:
    Rook(after witnessing Albedo disguised as Ben betraying them): That's not Ben!
  • Cat Boy: Word of God is that his species are humanoid felines. It's revealed in "Arrested Development" that Rook had a tail as a child, and that his species's tails fall off at puberty.
  • Chick Magnet: "Bros in Space" states that girls flocked to Rook, but he only had eyes for Rayona.
  • Convenient Replacement Character: Once Gwen and Kevin left Bellwood, that same episode has Rook stepping in as Ben's new partner.
  • Country Mouse
  • Crazy-Prepared
  • Ditzy Genius: It comes from naviete rather than any actual ditziness.
  • Does Not Understand Sarcasm
  • Farm Boy: His entire species' culture is built around farming. He mentions that he honed his skills battling the rather dangerous vermin plaguing his family's crops before joining the Plumbers.
  • Foil: To Ben; he is a By-the-Book Cop with no actual experience, in contrast with Ben being Taught by Experience with little training. Moreover, he relies on technology, while Ben relies on alien biological abilities. Word of God admitted this was the guiding purpose in his design.
  • Fur Is Skin: Being a cat-like alien, he has fur, but it looks like blue skin.
  • Gadgeteer Genius: He designed and built his Proto-tool; he also can operate a large amount of alien technology.
  • Genre Blind: In Ultimate Heist, he fails to realize Albedo is with him instead of Ben despite all the Out-of-Character Alerts, because he is too happy to see Ben following his advices for once.
  • Heterosexual Life-Partners: Ben already considers him his best friend.
  • Hyper Competent Sidekick: Played with; Ben is far from incompetent and has much more experience, but Rook still displays much more impressive fighting skills and ways to deal with situations.
    • Deconstructed in "Of Predators and Prey"; after going around with Ben for a while, he ends up believing Ben doesn't live up the legend and only saved the universe because he had people around to help him. This, plus Ben's Jerkass tendencies, led them to argue and split up, allowing Khyber to finally attack Ben alone. While this ultimately seems to have just been a ploy to lure out Khyber, Rook admits that he was actually quite serious during his "The Reason You Suck" Speech.
  • Interspecies Friendship: He, a Revonnagander, with Ben, a human.
  • In the Hood: He is introduced as a customer wearing a hood.
  • The Lancer: Rook now has this role to Ben.
  • Last Name Basis: Rook is the family name — Blonko is actually his first name.
  • Literal-Minded
  • Meaningful Name: Rook is a rookie when it comes to being on the field.
  • Mix-and-Match Critters: In "Outbreak", Rook is accidentally made into a half-Upchuck version of himself due to a glitch with the Omnitrix, leading to:
  • Na´ve Newcomer: Despite having read a lot about his task as a Plumber and trained extensively, Rook had never actually fought criminals before being assigned to Ben. As a result, he is naive and inexperianced.
  • Nice Guy: In notable contrast with Gwen's and Kevin's snarkyness in the original series and Alien Force respectively, Rook appears to be a nice person who genuinely admires and respect Ben.
  • Non-Human Sidekick: Downplayed as he is a humanoid with some cat features.
  • Not so Above It All: Despite his usual serious attitude, he took a lot pleasure making Ben fall in water in "Malefactor".
    • Also, in "Bro In Space", Ben is amazed to learn he has a Love Interest.
  • Offhand Backhand: Deflects a laser with a spoon he was eating with!
  • Older Sidekick: According to Word of God, he's a little older than Ben.
  • Post-Mortem One-Liner: Played for laughs; due to Ben's Deadpan Snarker tendencies, he believes he's supposed to say something witty after subduing a criminal. The results are usually lame.
  • "The Reason You Suck" Speech: delivers one to Ben during their argument in Predator and Prey:
    "How many times you have saved this Universe? By yourself? Zero! Everytimes, there have always be someone there to help you! [...] I have been there! I have already saved you countless times, and I have only been with you a few weeks! I am surprised you made it this far!"
    • Take note that, Part 2 of "Of Predators and Prey" shows that Ben and Rook were pretending to fight, however Rook didn't get part of that memo and was somewhat honest about that whole "saving the universe by yourself" bit.
  • Sacrificed Basic Skill for Awesome Training
  • The Sixth Ranger: A much straighter example than Julie, who only helped Ben's Team on occasion, without any true dedication. Ben at first treated Rook with an attitude newcomers usually get. Later on, he gets promoted The Lancer role.
  • Skilled, but Naive: In contrast to Ben, Rook is extremely well trained, but inexperienced in combat with actual opponents as well as Earth culture.
  • Spock Speak: In the first three episodes, he used contraction, however, by the fifth episode, he begins to speak formally.
  • Swiss-Army Weapon: His Proto-tool can transform into almost any kind of weapon, including:
  • The Team Normal
  • Token Non-Human: Among Ben's main circle of friends and partners.
  • True Companions: With Ben
  • Weak, but Skilled: Khyber pointed out during their fight that Rook's weapon was versatile, but lacked power. Rook wins anyway.
  • "Well Done, Son" Guy: He has a mild form of this with his traditionalist father who disliked him becoming a plumber.

    Max Tennyson 

Grand Magister Maxwell "Grandpa Max" Tennyson

Voiced by: Paul Eiding

Ben's and Gwen's Grandfather, as well as probably the most badass human being in the whole Ben 10 Universe. A former member of a government organisation known as the Plumbers, Max Tennyson serves to his grandkids as a Mentor and Reasonable Authority Figure.

  • The Ace: To the Plumbers he is a legend because he was one of the best.
  • Adorkable: Back when he first met Verdona, he managed to hit this trope while still being badass. The early 1960s setting- so early that one would think it to be fifties if not for the Kennedy reference- definitely helped.
  • Adults Are Useless: Averted. He has the experience, the tools, and the ability to take down villains with or without his grandchildren's help. He knows about the Omnitrix from the beginning, does his best to help, and, when informed by his granchildren about aliens or other weird phenomenon, believes them.
  • Badass: One of the biggest badasses in the franchise.
  • Big Good
  • Commuting on a Bus: Doesn't appear as often after the original series. Justified in that Ben and Gwen don't need him as much now that they're older.
  • Cool Car: The Rustbucket.
  • Cool Old Guy
  • Dead Partner: Devin Levin. Though Omniverse retcons this into being a fake memory; he never met the real Devin.
    • His old partner Phil as well by Omniverse.
  • Gadgeteer Genius
  • My Greatest Failure: He always regretted putting Phil in the Null Void rather than just taking him to prison. This is made all the worse both times Phil returns, the second of which it is revealed that Phil is dead, meaning that Max will never get that second chance.
  • Hawaiian-Shirted Tourist: Never seen without his Hawaiian shirt, unless he's in full Plumber gear. Pakmar even refers to him as "colorful shirt man".
  • Heroes Want Redheads: As evidenced by Verdona in the Whole Episode Flashback.
  • Interspecies Romance: His two love interests were both aliens; Verdona, an Energy Being, is the mother of his children (sine she's a Reality Warper, they are human through and through, save for Gwen).
  • I Was Quite a Looker: In the flashback episode to his early years, he fulfills this trope in spades. Yum yum.
  • The Kirk: Of the original series.
  • Lethal Chef: He is not exactly a bad cook, he just has very... weird tastes in matter of food and ingredients (termites and squid to give examples). Gwen, Ben and most regular humans are creeped out just by looking at this, but some aliens, like Xylene and Rook, are quite found of it.
  • The Mentor
  • The Men in Black: The Plumbers
  • Missed the Call: The Omnitrix was sent to Earth with the intent of Max finding it, not Ben.
  • Morality Chain: Sort of, to Ben; at least, he played a large part into making Ben a proper hero; "Store 23" shows us an alternate reality where he died just before Ben got the Omnitrix, causing Ben to become even more narcissistic than he already was, create a Telereality show focused around him, treat all aliens as evil and almost cross the Moral Event Horizon by attempting to rip his dimension's Azmuth in half.
  • The Obi-Wan: Subverted.
  • Reasonable Authority Figure: And often much more reasonable than his granchildren.
  • Two Roads Before You: Had the chance to be the first man on the moon, but then he was approached to join a certain interstellar organization.
    Characters/Ben 10 Ben 10 Omnitrix Aliens
Ben 10Characters/Western AnimationBen 10 Omnitrix Aliens

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