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* BloodBrothers: With Ben, by his own admission towards Proctor Servantis.
-->'''Kevin:''' Ben's like a brother to me. Even when I don't deserve it.
-->'''Kevin:''' Ben's like a brother to me. Even when I don't deserve it.
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Just For Pun is a disambiguation
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* MistakenIdentity: Because of his watch, expect someone to mistake him for Ben or a relative of his. Taken up to [[JustForPun eleven]] when he and Ben lose memories and swap phones, leading them to read each other's diaries and think they're each other.
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* MistakenIdentity: Because of his watch, expect someone to mistake him for Ben or a relative of his. Taken up to [[JustForPun eleven]] eleven when he and Ben lose memories and swap phones, leading them to read each other's diaries and think they're each other.
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[[center:[[WMG:[-''Characters/Ben10'' [[Characters/Ben10 franchise character index]]\\
[[Characters/Ben10MainCharacters Main Characters]] ([[Characters/Ben10BenTennyson Ben Tennyson]], '''Kevin Levin''') | [[Characters/Ben10OmnitrixAliens Omnitrix Aliens]]\\
Villains premiering in: [[Characters/Ben10VillainsOriginalSeries The Original Series]] ([[Characters/Ben10Vilgax Vilgax]], [[Characters/Ben10ForeverKnights Forever Knights]]) | [[Characters/Ben10VillainsAlienForce Alien Force]] | [[Characters/Ben10VillainsUltimateAlien Ultimate Alien]] | [[Characters/Ben10VillainsOmniverse Omniverse]] | [[Characters/Ben10VillainsSpecials The Specials]] | [[Characters/Ben10Villains2016Series The 2016 series]]\\
[[Characters/Ben10SupportingCharacters Supporting Characters]]-]]]]]
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!!Kevin 11 (Kevin Ethan Levin)
->'''Voiced by:''' Creator/MichaelReisz (first appearance), Creator/CharlieSchlatter (remainder of Original Series), Creator/GregCipes (''Alien Force'' onwards), Creator/YuriLowenthal (''[[VideoGame/CartoonNetworkPunchTimeExplosion Cartoon Network Punch Time Explosion XL]]'')
The supervillain alter-ego of Kevin Levin, Ben's original EvilCounterpart and [[ArchEnemy second major nemesis]]. An 11-year-old boy Ben befriends in New York City, Kevin seems like your average street kid delinquent, but actually has superpowers that allow him to absorb energy. After revealing himself to be a disturbed sociopath, Kevin absorbs the power of Ben's Omnitrix, which backfires on him when it eventually mutates him into a hideous amalgamation of all 10 of Ben's aliens. Now dubbing himself "Kevin 11", he is obsessed with getting {{Revenge}} on Ben.
Following the TimeSkip 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 ConMan. 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 LoveInterest.
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[[foldercontrol]]
[[folder:Original Series]]
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/kevin_e_levin.png]]
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/kevin_11.png]]
-->''"[[TheReasonYouSuckSpeech You'll never beat me, because you're]] [[TheCape one of those good guys]]. [[ThouShallNotKill And good guys never have the guts to finish guys like me]]!"''
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* AbusiveParents: Implied to have them, as he claims they threw him out due to his powers. [[spoiler:''Ultimate Alien'' reveals this to be untrue; his mother and stepfather didn't kick him out. He went insane after absorbing energy and demolished their house, and [[SelfServingMemory his insanity caused him to remember things differently]].]] He's also an abusive father to his son Devlin as Kevin 11,000 in the future.
* AllYourPowersCombined: {{Downplayed}}. He absorbed the powers of Ben's original 10 aliens, but none of his additional forms such as Cannonbolt or Wildvine. This also serves as a bit of an InformedAbility considering we never see him using the abilities of Grey Matter, Upgrade, or Ghostfreak. It's also worth mentioning that his powers function at 10% of the strength of the original (which may justify the "absence" of Grey Matter in particular from Kevin's demonstrated abilities, as 10% of a genius wouldn't amount to much of a difference for Kevin). Although thanks to Ben's advice during the ChainedHeat episode, Kevin learns that he can combine various abilities to increase their efficiency.
* AntiVillain: He could be considered a very rough Type II. WordOfGod is that [[https://68.media.tumblr.com/9270f5ca74f393cee1cca0cc15dced47/tumblr_oac430oTSl1sdo9gko1_500.png he was always meant to develop]] into more of an AntiHero overtime.
* ArchEnemy: To Ben during the original series. He was the second most dangerous and personal, preceded only by Vilgax. Notably, he stayed that way in the Ben 10,000 future (as shown in the Original Series episode "Ken 10") before reforming (as revealed in the ''Omniverse'' episode "The End of an Era").
* ArtificialHybrid: Once Kevin starts absorbing energy from the Omnitrix aliens, he becomes a hybrid of whatever form Ben takes at the time, such as Heatblast and Fourarms in his debut episode. It gets taken further as Kevin 11, where he's now a chimeric mutant with the combined [=DNA=] of all ten of Ben's aliens.
* AxCrazy: In his first appearance alone, without gaining any of Ben's power, he plans to crash trains into each other to take valuables from the people that will be killed.
* BarbarianLongHair: He sports an impressive black mane, which is the only thing recognizable when he turns into a mutant alien. It really emphasizes his savage nature.
* BerserkButton: What gets Kevin to snap and mutate out of control is Ben telling him he's NotWorthKilling and never was.
* BigBad: Of season 2 of the Original Series, though [[spoiler:he [[BigBadDuumvirate shares the position with Vilgax in the season finale]].]]
* BlessedWithSuck: Kevin's energy-absorbing powers are useful, but also incredibly destructive and earn him the fear of those around him. It gets worse when he absorbs the Omnitrix's powers, as he can't shift into a human for long and eventually gets stuck as a monstrous alien hybrid.
* BloodKnight: He seems to feel right at home on the Megacruiser, openly enjoying the gladiator-style battles a lot more than Ben.
* BodyHorror: The partial transformations he gets as a result of absorbing some of the Omnitrix's energy are not pretty to look at.
* BladeBelowTheShoulder: He often morphs his Diamondhead arm into a blade, which he notably uses to gut Slix Vigma.
* ChaoticStupid: As a kid, though he has some moments of actual planning. Kevin 11,000, however, was more calculating before his reform into a good guy.
* ContrastingSequelAntagonist: To Vilgax. Both serve as Ben’s most personal enemies and both want the power of the Omnitrix. But while Vilgax is an alien who wants to use the Omnitrix to create an army of aliens and conquer the universe, Kevin is a human who absorbs the power of the Omnitrix which transforms him into a mutated abomination who wants to kill Ben and his family.
* CreepyChild[=/=]EeriePaleSkinnedBrunette: A dark-haired, black-wearing kid living on the street despite being 11 years old, prone for {{Slasher Smile}}s, with destructive electrical powers and [[TroublingUnchildlikeBehavior disturbing levels of psychosis for his age]]. And this is all ''before'' he starts physically mutating.
* DarkIsEvil: His alien transformations in ''Framed'' all have a darker color scheme than Ben's.
* DisneyVillainDeath: His apparent demise at the end of "Framed". Unsurprisingly, he survived.
* DumbMuscle: Despite supposedly having all of the Omnitrix's powers, he hardly ever uses them to their full potential. He's still a brash, ill-tempered little kid, so his answer to practically everything is brute force.
* EnergyAbsorption: His basic power allows him to absorb and redirect energy, as seen with the common source of energy in electricity. Once he starts absorbing energy from Ben's aliens due to the Omnitrix, he gains part of their abilities in the process. [[spoiler:''Ultimate Alien'' reveals that [[WithGreatPowerComesGreatInsanity it also has the sad side effect of making him go more and more nuts]].]]
* EnfantTerrible: He is only one year older than Ben, yet he rivals ''Vilgax'' as one of the most psychotic villains in the show.
* EnhancedPunch: [=XLR8=]'s speed + Four Arms' strength + Diamondhead's durable fist = "one mean punch".
* EvilCounterpart: He's a lot like Ben, but without ''any'' of his morals or standards. He even gets a NotSoDifferentRemark from Ben himself once his mind is set upon crashing the trains.
* EvilLaugh: He lets out an absolutely chilling one at the end of his debut appearance once he realizes that he's successfully absorbed all of Ben's powers.
* EvilMakesYouMonstrous: While Ben's alien alter-egos are usually bizarre to look at, Kevin's mutation is positively grotesque, an abomination cobbled together from bits of DNA he absorbed.
* EvilWearsBlack: His clothing from his original human form is black.
* FalseFriend: To Ben in his debut episode. Kevin first meets Ben by using his powers to give him some coins to play the arcade games and for the first half of the episode, the two of them bond over the need for freedom and to be unrestrained by the strict rules, and eventually became "friends" after Ben reveals his powers to Kevin. Then came Kevin's "plan" to steal money by causing a train wreck...
* FamilyUnfriendlyDeath: Gives one to Slix Vigma [[ImpaledWithExtremePrejudice by impaling him with his Diamondhead arm]]...and if Ben hadn't gone Cannonbolt, he would have been next.
* FrameUp: In his second appearance, Kevin is able to shapeshift into the aliens of the Omitrix. He uses this power to commit a crime and frame Ben's alien forms for the deed to ruin Ben's reputation.
* FreudianExcuse: Everyone treated him like a freak and a monster because of his powers, so the unstable kid basically decided to do his damnedest [[ThenLetMeBeEvil to prove everyone right]].
* FromBadToWorse: Kevin started out as a small-time, albeit horrendously amoral delinquent with strange powers. Then he gets a taste of the Omnitrix and starts wreaking havoc on a larger scale. Then he mutates into a monstrous combination of all 10 aliens and becomes a savage, inhuman beast driven by his hatred for Ben.
* GoodScarsEvilScars: Kevin 11,000 has an X-shaped scar on his chin.
* HairTriggerTemper: Especially after being trapped in chimera form. He's almost perpetually in a blind rage and very unreasonable to work with for both Ben and later Vilgax.
* HumanoidAbomination: As Kevin 11,000 he is capable of turning back to his human form, but still possesses all the alien abilities he absorbed, and is capable of turning into one creepy OneWingedAngel form.
* ImposterForgotOneDetail: After absorbing the Omnitrix and being capable of transforming into the original 10 of Ben's alien forms, Kevin's transformations are practically [[IdenticalStranger identical]] to Ben's but with a darker color scheme and lacking the Omnitrix symbol. {{Subverted|Trope}}, however, as nobody notices this in ''Framed'', not even Gwen and Grandpa Max.
* InferioritySuperiorityComplex: He is arrogant and likes to say that he's the best, but his anger at people mocking him or calling him a freak exposes his insecurity. Kevin 11,000 on the other hand, does not seem to have such insecurity, outright saying he knows he's the best and is only attacking Ben and his family because he ''likes'' it.
* InformedAbility: He boasts that his mutant form has all of Ben's ten original alien powers, plus his own energy absorption ability, hence the nickname "Kevin 11". In practice, however, he was never seen using his energy absorption power in this form, nor the abilities of Grey Matter, Ghostfreak, and Upgrade.
* {{Jerkass}}: As he becomes more powerful, Kevin also becomes much more of a petty, bullying prick toward Ben. He frames Ben for his own crimes, mocks his attempts to reason with him, and spends as much time as he can treating the kid like garbage when they're chained together on the Megacruiser.
* JerkWithAHeartOfJerk: He milks sympathy from Ben in his debut, only to pull a RedemptionRejection afterward.
* LackOfEmpathy: His response to being called out for potentially killing hundreds of people just to grab some quick cash? "No pain, no gain."
* LightningBruiser: He has access to [=XLR8=]'s speed (albeit he doesn't master it as well) plus the physical strength of Four Arms.
* LoopholeAbuse: The reason he can absorb Ben's alien forms in his debut episode? Because the Omnitrix gives off energy in the form of ''pure'' alien [=DNA=].
* LovecraftianSuperpower: Absorbing energy from an alien allows him to acquire its power, but has the side effect to turn him into a disturbing hybrid of said alien and himself. Absorbing energy from the Omnitrix itself eventually causes him to turn into a ''very'' disturbing amalgam of ''all'' aliens.
* MagicPants: Zig-zagged. When he transforms into versions of Ben's aliens, his clothes change with him, even becoming Ben's clothes at times(though this might be because Ben's data was programmed into the Omnitrix). Yet when he mutates into his chimera form, his clothes clearly shred and he's shirtless the rest of his appearances. This is mostly averted as an adolescent but used again as Kevin 11,000.
* MasterOfNone: As Kevin 11, he has the powers of all 10 of Ben's original alien forms, but they are diluted and only a fraction of what they should be. During a brief EnemyMine team-up with Ben, he learns to compensate for this by using multiple powers at once, in combinations that Ben isn't capable of.
* MirrorCharacter: Part of his introduction. Just like Ben, he is a kid with powers [[ScrewTheRulesIHaveSupernaturalPowers who is not afraid to use them to screw the rules]]. [[{{Foil}} The difference is]], Ben is genuinely [[ChronicHeroSyndrome altruistic]] and has some standards, while Kevin is a sociopath with no scruples or empathy whatsoever.
* MultiArmedAndDangerous:
** "Tetramand Kevin" is closer to a Tetramand than a hybrid (completed with ''six arms'') and he's capable of giving Fourarms a tough time until the latter starts getting serious when the Omnitrix is about to tap out.
** His current mutated form has multiple arms like Four Arms, but one is Diamondhead's, another is Heatblast's, and two are Wildmutt's. He is also stronger than Four Arms, which makes sense as Fourarms body shape serves as the base for the combined DNA of Ben's other 9 alien forms.
* NeverMyFault: He blames Ben for his mutation, even though technically, ''he'' was the one who tried to mess with the Omnitrix in the first place. He also blames Vilgax when the two become trapped in the Null Void, even though Kevin was the one who betrayed Vilgax.
* NeverSayDie: An odd quirk of Kevin's is that for how hellbent he is on killing Ben, he avoids saying explicitly so. Instead, he uses "wax" or "kick your butt." This might be because he's still a child trying to sound cooler than he actually knows how.
* NotWorthKilling: Ben tells him this word for word after defeating him for the second time. Unfortunately, this causes Kevin to lose all control of his anger and hate as well as his control over his powers, turning him into a chimera made from Ben's aliens.
* OffscreenMomentOfAwesome: He apparently defeated Technorg and took over the Megacruiser ''all by himself''. By the time he finds Vilgax, he's also been to various worlds and endured many offscreen fights.
* SanitySlippage: While Kevin was never a very stable boy, he was more rational when Ben met him and didn't try anything seriously destructive until he saw what the Omnitrix could do. After taking the watch's power, he physically and mentally devolves into a brutal, unhinged monster, flying off the handle constantly and savagely attacking anything in sight. The later series would provide a more detailed explanation for this.
* ShapeShifterMashUp: It happens whenever he absorbs Ben's powers, as he can't maintain control over the transformations the way the Omnitrix can.
* SimpleYetAwesome: His only noteworthy power that surpasses Ben's transformations as Kevin 11 is his SuperStrength (he boasts that he still has his EnergyAbsorption power, but it's more of an InformedAbility), given that he has Fourarms' body shape serving as the base while his other alien powers are only 1/10 as strong as the originals. Then again, in the hands of a perpetual, homicidal raging delinquent, it works just fine. ''Especially'' when he starts combining his other, weaker alien powers to complement his physical strength.
* PetTheDog: In his first scene, he steals a bunch of tokens for Ben when the latter doesn't have money for the arcade. And this was before learning what the kid really was. Sadly, any shred of human decency is lost on him as he gets to know Ben better, and it takes a long, long time for him to gain it back.
* RedemptionRejection: After defeating him for the first time, Ben offered to help reform him and get people to like him, even offering him a spot as an ally. Kevin seemingly accepted… only so he could get close enough to try and take the Omnitrix.
* TheRival: To Ben, even after his HeelFaceTurn in ''Alien Force''.
* {{Sadist}}: Referred to as one by Slix Vigma in the ChainedHeat episode.
* SlasherSmile: His most frequent expression.
* TheSociopath: He has a complete LackOfEmpathy for anyone else and takes pleasure in inflicting pain onto others.
* ThenLetMeBeEvil: "If they thought I was a freak before, ''just wait''."
* TroublingUnchildlikeBehavior: In his introduction episode, he attempted to provoke an underground bus accident that would cause many people to die just so he could take money and valuables on their bodies. In alien and mutant forms, he is frequently shown trying to kill people in gruesome ways, typically using Diamondhead's BladeBelowTheShoulder, all while [[SlasherSmile smiling gleefully]]. Keep in mind that at the time, Kevin was ''11 years old''.
* TookALevelInBadass: As Kevin 11,000, he's not only more powerful but a lot calmer and more calculating than his psychotic but immature kid self.
* TookALevelInKindness: Granted, we don't see it progress until much later, but his time in the Null Void and his chance friendship with Kwarrel helped restore his humanity both figuratively and literally.
* UnexplainedRecovery: During the third time he shows up (despite apparently being killed previously), his explanation of how he survived boils down to this, as well as a recap of what happened last time. He doesn't actually use the phrase, but it's implied.
* UngratefulBastard: When Ben spared him in the original series, Kevin snaps and transforms into a hideous chimera of Ben's aliens.
* UnskilledButStrong: After accidentally absorbing a sufficient amount of [=DNA=] of the 10 original aliens from the feedback pulse emitted from Ben's Omnitrix, Kevin essentially becomes a ''living'' version of the Omnitrix himself. However, he has little control over his stolen 10 alien transformations compared to Ben's Omnitrix as seen in ''Framed''; he can't revert back to his human form nor stay as a human for long (ironically the opposite to Ben), but is capable shifting into a different alien form relatively quickly and without the drawback of timing out like Ben's Omnitrix. In the same episode, he eventually becomes human again after overusing his alien transformations by shifting between them constantly for a while. This eventually gets deconstructed as his lack of control over his energy absorption powers, the stolen alien [=DNA=] still inside of him, and the anger he feels from Ben sparing him and telling him that he's NotWorthKilling, permanently mutate him into Kevin 11.
* VillainForgotToLevelGrind: Downplayed example in "Grudge Match", where he boasts that he knows all 10 of Ben's aliens and as such nothing Ben can do will surprise him. Unfortunately for him, Ben had acquired Cannonbolt in between.
* WalkingShirtlessScene: As Kevin 11, his only clothes are his cargo shorts.
* WeakButSkilled: His powers as Kevin 11 are only a tenth as efficient as Ben's (though he's stronger than Fourarms) but he can combine them to overwhelm his opponents.
* WoobieDestroyerOfWorlds: Implied in "Framed." When Ben calls him out on risking the lives of innocent people just to get back at him, Kevin responds as follows:
-->'''Kevin:''' ''Nobody's'' innocent! They just haven't had a chance to make fun of me yet!
* XMarksTheHero: Inverted with Kevin 11,000: despite being a complete asshole and unrependent, he sports this scar on his chin.
* YoungerThanTheyLook: After his transformation, he's an 11 year old kid in the body of a hulking chimeric alien, much like Ben in his adult-like alien forms.
[[/folder]]
[[folder:''Alien Force'' & ''Ultimate Alien'']]
[[quoteright:248:https://static.tvtropes.org/pmwiki/pub/images/kevin_levin_ultimate_44.png]]
* AntiHero: Though he fights for good, his checkered past makes him a great deal shadier than Ben and Gwen and willing to make deals with criminals such as Argit and Vulkanus to help in their missions. He's also dead set on murdering Ragnarok to avenge his dead father.
* ArbitrarySkepticism: 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. This seemed to fade over time. During "In Charm's Way," he told Charmcaster (disguised as a girl named Caroline) that Gwen was "made of magic."
* TheAtoner: He officially becomes this after seeing Magister Labrid die and turns over a new leaf as a promise.
* BeyondRedemption: Near the end of season 1, when he's remutated by absorbing energy from the Ultimatrix to defeat Aggregor. The result: Kevin becomes an AxCrazy PowerParasite who goes on a rampage absorbing the powers of everyone he comes across. After trying to reason with him and failing, Ben eventually becomes convinced that Kevin's too far gone and they have to [[ShootTheDog put him down]]. When Gwen approaches Grandpa Max for help on the subject, she's shocked when Max agrees with Ben's approach, despite admitting that [[OOCIsSeriousBusiness he never thought Ben would go that far]].
-->'''Ben''': He's never gonna stop- unless ''I'' stop him. For good.
* BigBad: Is driven insane by absorbing Aggregor's powers in the first season of ''Ultimate Alien''.
* TheBigGuy: He serves as the muscle on Ben's Team and has a tendency to act before thinking.
* BodyHorror: 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'', 4th in ''Omniverse''). He manages to revert back to normal as each series progresses.
* BookDumb: 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.
* BrilliantButLazy: He has a very laidback approach to life and could probably do a lot better if he put in some effort. In ''Omniverse'', he does just this and manages to get a paying job.
* CoolCar: His green sports car is the signature vehicle of the ''Alien Force/Ultimate Alien'' era, and is constantly being updated with Plumber tech and criminal tech alike. It also tends to get [[ChronicallyCrashedCar destroyed a lot in battle]], much to Kevin's chagrin.
* DarkIsNotEvil: Starting with ''Alien Force'', he pulls a HeelFaceTurn despite his DarkAndTroubledPast and mainly black color scheme.
* DeadpanSnarker: Even in a trio where all three members are snarky teenagers, Kevin is easily the biggest one of the three and drops sarcastic comments at nearly every opportunity. His dry sense of humor is actually the main source of comic relief throughout ''Alien Force'' and ''Ultimate Alien''.
* DisappearedDad: Devin Levin. KIA, courtesy of Ragnarok. Or so we are led to believe. ''Omniverse'' retconned Devin Levin into a false memory implanted by Servantis to manipulate Max into watching over Kevin. The identity of Kevin's father is unknown; though a photograph of Devin does suggest that he was a real person, the explanation for his disappearance is most likely far more [[AmbiguouslyAbsentParent mundane.]]
* DistressedDude: He tends to get captured on occasion due to now being the weakest of the group.
* DitzyGenius: While being an expert in mechanics and alien tech, he's clueless and naïve when it comes to subjects here on Earth.
-->'''Gwen:''' If it isn't about his car... excuse me, his "ride", or some alien tech, he's pretty much oblivious.
* DueToTheDead: His HeelFaceTurn was influenced in part by his improved mental state, but the thing that kickstarted it was wanting to honor Magister Labrid's HeroicSacrifice.
* TheEngineer: Serves as this role on the team, as he's the go to guy for alien-tech.
* EveryoneHasStandards:
** Despite being a staunch AntiHero who's done some shady things in his life, Kevin is so horrified when he witnesses Jarrett of the Pantophage eat the Tiffin that he actually ''faints''.
** In the sixth episode of ''Ultimate Alien'', Kevin backs out of freeing P'Andor from his suit when he realizes the amount of radiation he would be releasing would be incredibly deadly for Earth.
* FireForgedFriends: He goes from being one of Ben's worst enemies to one of his closest friends. As Ben puts it in the episode "Perplexahedron", Kevin went from the little kid trying to kill him every week to the older brother he never had.
* FreakOut: Kevin goes insane again in ''Ultimate Alien'' after absorbing the aliens in the Ultimatrix, nearly killing Aggregor and threatening to absorb the baby Celestialsapien for himself.
* GeniusBruiser: He is the team member who relies on brute force the most, and his powers enable him to gain SuperStrength and durability. However, he is also exceptionally knowledgeable about alien technology and is a GadgeteerGenius.
* HalfHumanHybrid: Half human, half Osmosian. This is a retcon from the original series, which intended for him to be a mutant. '' Omniverse'' goes closer to the intention from the original series by retconning Osmosians into being a human subspecies, not aliens.
* HeelFaceReturn: He's a small-time crook with [[JerkWithAHeartOfGold a heart of gold]] who is easily persuaded to join Ben and Gwen in the first episode of ''Alien Force'', which is a far cry from how he was when last left off in the original series.
* HeelFaceRevolvingDoor: 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 SeasonFinale.
* HeroicSacrifice: Non-fatal example. He saves the universe and defeats Aggregor, but at the cost of his sanity.
* HeroicWillpower: A flashback in ''Ultimate Alien'' reveals he had to concentrate to get back to normal from his transformation in the original series.
%%* {{Hypocrite}}: In ''Ultimate Alien'', a weird trend occurs where he starts being more distrustful and judgmental toward people who are either morally dubious or were evil and now trying to reform. Why this is hypocritical shouldn't have to be explained. Those in glass houses shouldn't throw rocks, Kevin! %% Huh? When did he ever do this?
%%* IfYouKillHimYouWillBeJustLikeHim: "Vendetta". [[spoiler:He doesn't listen. [[AssholeVictim Not that Ragnarok didn't deserve it, though]].]] %% Elaborate on the whole situation; separated, short sentences tell us nothing.
%%* IndyPloy
* JerkWithAHeartOfGold: He tries to keep up his ruffian attitude, but he has genuinely changed and is now a force for good.
* KnightOfCerebus: During the "Ultimate Kevin" arc, where he becomes one of the darkest villains and the show takes on a new level of seriousness. During this time he becomes a deranged, relentless, PowerParasite who absorbs the powers of everyone he comes across. Ben also displays a darker side where he becomes determined to [[ShootTheDog put Kevin down]].
* LongHairedPrettyBoy: His hair reaches his shoulders. By ''Omniverse'', it's a full-blown mullet.
* LovableRogue: Downplayed. He still gets involved with the criminal underground every now and then, but less and less as the series goes on. Still, even when he does, his charisma and wit almost always keep him entertaining.
%%* TheMcCoy
* MyNameIsInigoMontoya: [[ShoutOut Quoted verbatim]] against Ragnarok, who killed Kevin's now-retconned father. Then invoked a second time in ''Ultimate Alien'' for his old mentor Kwarrel.
%%* PayEvilUntoEvil: [[spoiler:Ragnarok.]]
* PunnyName: Kevin E. Levin can also be read as Kevin 11, his old supervillain name from the original series. Also doubles as RhymingNames if you don't count the "E".
* RedOniBlueOni: He's the red to both Ben and Gwen's blue, as the most hotheaded and aggressive member of the trio.
* RedemptionDemotion[=/=]RedemptionPromotion: Both at once! While he doesn't use the powers he had in the original series, and is the most likely of the trio to get [[TheWorfEffect beaten up in battle]], he's become smarter during the TimeSkip and continues to show it as he spends more time with Ben and Gwen. This especially shows halfway through ''Ultimate Alien'''s first season.
* ReformedCriminal: 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.
* TheResenter: 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 homelife... it'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.
* RoaringRampageOfRevenge: After being driven insane in ''Ultimate Alien'' he decides to go on one of these whenever he's not absorbing other people's powers.
* RunningGag:
** His [[ThePreciousPreciousCar precious precious car]] keeps on getting destroyed.
** [[CharacterCatchphrase "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 that he used an indestructible piece of Tetramand tech he got from his engagement with Princess Looma.
* SameCharacterButDifferent: It's hard to deny that Kevin is an entirely different character than what he was in the original series -- he went from being a sociopathic, sadistic monster to a shady and sarcastic but good-hearted JerkWithAHeartOfGold. Its to the point where his villainous persona has its own seperate page on this very site. ''Alien Force'' and ''Ultimate Alien'' go to great lengths to explain this drastic change, most notably through the reveal that Osmosians go insane when they absorb energy.
* SlasherSmile: When he's re-corrupted with energy in ''Ultimate Alien'', these return.
* ShapeShifterModeLock: Throughout ''Alien Force'''s third season, Kevin is trapped in a mutation made of various materials he had absorbed over the first two seasons.
* SpeedDemon: Kevin has shades of this from ''WesternAnimation/Ben10AlienForce'' onwards, where he is obsessed with his CoolCar which he modifies with alien tech to make it one of the fastest cars on the planet.
* SuperPoweredEvilSide: His energy-crazy persona comes off suspiciously like this. His personality reverts almost entirely to what it was as Kevin 11, as if they had different memories, and only comes out when he absorbs energy and becomes more superpowered.
* SuperPowerLottery:
** EnergyAbsorption: His original power. ''Ultimate Alien'' explains why he never uses it again after the original series.
*** ComboPlatterPowers: 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.
*** VoluntaryShapeshifting: Initially, when he absorbed energy from the Omnitrix the first time. [[ShapeShifterModeLock Didn't last however]]...
*** AllYourPowersCombined: 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.
** PowerCopying: He can also steal the powers of others, and integrate them into himself.
** MaterialMimicry: 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 Kwarrel.
*** SuperStrength: When absorbing tough materials like stone, steel, or Taydenite, his strength increases immensely. He once casually blocked a punch from ''Vilgax'', and in another episode, he picked up a car and hit a raging Ultimate Humungousaur so hard he went flying across the block.
*** RubberMan: He once turned his body rubber after touching the tires of his car.
*** MidseasonUpgrade: He gets shape-shifting powers in "The Vengeance Of Vilgax" that make him stronger, which he retains even after being restored to human form. It made a plot point in that if he hadn't got them as they'd have been unable to save the world from Hex. This ''really'' helps increase his usefulness to the team.
*** HealingFactor: It's revealed at one point that Kevin's armored form also has regenerative powers, much like Diamondhead. This comes in handy when he gets his arm cut clean off and is able to restore it in seconds.
* TallDarkAndHandsome: After the TimeSkip, Kevin has become a well-built, dark-haired pretty boy, who Gwen falls for almost as quickly as he does her.
* TallDarkAndSnarky: As stated above, teenage Kevin is tall, good-looking, and dark-haired. He's also the biggest DeadpanSnarker of the series.
* TeensAreMonsters: Inverted, he was evil as a child, but turned good after becoming a teenager.
* TokenEvilTeammate: Starts out as this in ''Alien Force'', getting involved in shady affairs with criminals and generally showing dodgy behavior, but he quickly grows past it.
* TookALevelInJerkass: In the third season of ''Alien Force'', Kevin is more of a jerk than usual. Much of this is caused by the {{angst}} of his new mutation, but there are also episodes that relapse him into his criminal past, such as when he profits off of a warring planet by selling them weapons.
* {{Tritagonist}}: He's the third member of the PowerTrio up until ''Omniverse'', and plays an incredibly important role in its dynamic.
* TroubledButCute: He starts ''Alien Force'' as a shady con artist with a lot to atone for, but Gwen can't help but be attracted to him anyway.
* {{Tsundere}}: Type A. He's hotheaded and {{angst}}y, and refuses to ask Gwen out despite their obvious feelings for each other. Fortunately, he does become more emotionally open by the second season.
* WhatTheHellHero: In "Hit'em Where They Live", when, Ben chastises Gwen for letting Zombozo's alliance kidnap his mother, Sandra when she was supposed to protect her. Kevin calls out on Ben's callousness when Gwen regrets failing to protect her aunt. Afterward, Ben backs down and apologizes to Gwen for his harsh behavior.
* WithGreatPowerComesGreatInsanity: Used in ''Ultimate Alien'' to rectify his extreme change in character as a kid. He falls off the proverbial wagon again later on.
* TheWorfEffect: He's usually always the one who gets his ass kicked the most in battle.
[[/folder]]
[[folder:''Omniverse'']]
[[quoteright:294:https://static.tvtropes.org/pmwiki/pub/images/kevin_x.png]]
----
* AbusiveParents: WordOfGod is that Kevin's real father was abusive towards him (like suggested in the original series), and that he ran away from him. After the Rooters were defeated, Kevin's memories of his real father returned.
* AntiHero: Kevin's still a hero at the end of the day, but his few focus episodes in ''Omniverse'' tend to focus on the darker parts of his past, such as his ConMan years with Argit and his history with the Rooters. "Many Happy Returns" also has him pawn off his engagement with Looma onto Ben with no remorse.
* BloodBrothers: With Ben, by his own admission towards Proctor Servantis.
-->'''Kevin:''' Ben's like a brother to me. Even when I don't deserve it.
* TheChewToy: Many of his appearances involve him getting injured... a lot. The ''Alien Force''/''Ultimate Alien'' era showed spades of this, but ''Omniverse'' really drove it home.
* ADayInTheLimelight: Even though he is less important than ''Alien Force'' and ''Ultimate Alien'', he has some episodes dedicated to him such as "OTTO Motives", "The Rooters of All Evil", "Weapon XI: Part 1", and "Weapon XI: Part 2" which he appears in the flashbacks and present.
* DemotedToExtra: Even when he does come back, he usually accomplishes even less than his ''Alien Force''/''Ultimate Alien'' self. For example, in "Showdown", his role in the whole episode consists in... befriending Khyber's pet. and in Mud Is Thicker Than Water he only makes a cameo appearance along with Rook who go to an auto show instead of helping Ben, Gwen, and Lucy with Pysphon and his thugs. However, he does have a few episodes focusing on him.
* DidntThinkThisThrough: In "OTTO Motives" both his car and Rook's truck got totaled in the fight between Ben and VillainOfTheWeek 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 choice 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 out, it'll be ''very'' hard to find a buyer for something that expensive.
** However, he eventually realizes he can transmute ''himself'' into taydenite, [[TakesOneToKillOne use his molded weapons to chip a bit off the car]], and use the bits as money.
* FakeDefector: Servantis notes he could never quite read or control Kevin's mind. Kevin uses this to his advantage by pretending to join him, then betraying him at the last second while freeing the Amalgam Kids from his control.
* FakeMemories: The Rooters are revealed to have implanted some in his head to get him close to Ben. One of these false memories is his Osmosian father, Devin Levin.
* {{Flanderization}}: His character design in this iteration takes the concept he had back in the original series (ruffian) and highlights it even more boldly through the fact that he now wears tattered clothes with eyeliner and looks like he just got back from a mosh pit show.
* GoodScarsEvilScars: Receives an X-shaped scar on his chin from being whipped by Swampfire. The same scar he had as Kevin 11,000 in the original series.
* HalfHumanHybrid: Retconned. He's not an alien at all, "Osmosians" are just humans with a unique genetic component (mutants) that gives them powers, Kevin's being energy/matter absorption.
%%* HeelFaceRevolvingDoor: While not so much in the present, WordOfGod explained this as to [[https://ask.fm/DerrickJWyatt/answers/120581521780 why, in the future, Kevin was on good terms with Ben in the finale]] despite the original Ben 10,000 future seeing Kevin as an irredeemable prick. %% See WeblinksAreNotExamples; it should mention evidence from the show, not the creator's remarks.
* ManchurianAgent: Proctor Servantis altered his memories to get him close to Ben.
* NeverMyFault: Seems to have developed this problem again. When Princess 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.
* NoYay: In-universe, this is his reaction to seeing Bullfrag flirting with Attea.
* OutOfFocus: He accompanies Gwen when she leaves Bellwood to go to college, thus is absent for most of the series.
* PutOnABus: In the first episode, Gwen leaves for college, and he leaves to live near the campus.
** NotAsYouKnowThem: 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.
* TomatoInTheMirror: He finds out that just about ''everything'' people know of him and what he knows of himself is wrong and based around false memories planted in him by Proctor Servantis of the Rooters. He naturally takes this pretty hard.
* TookALevelInDumbass: 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 ''The Frogs of War''.
* TookALevelInJerkass: Possibly, in an attempt of RevisitingTheRoots, ''Omniverse'' portrays him as more of jerk by revealing his backstory with Princess Looma and having him pulling out a BatmanGambit to get rid of her by giving her to Ben. Even ''Argit'' seems to think he exaggerates.
* UnwittingPawn: To the Rooters due to false memory implants. As it turns out, all of his CharacterDevelopment of growing to care for the Tennysons was a part of Servantis's plan, though it ultimately backfires on him now that Kevin and Ben are TrueCompanions.
* VitriolicBestBuds: Still continues this type of friendship with Ben. He's also this with Rook.
* XMarksTheHero: Ignoring the regression of becoming a jackass again, ''Omniverse'' shows how Kevin got this scar.
[[/folder]]
[[folder:Reboot Series]]
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/reboot_kevin.png]]
* AdaptationalBadass: Not him (see below), but the Antitrix's version of Grey Matter, Dark Matter: he is much taller than Ben's, strong enough to hurt Four Arms and capable to create some kind of crystal-like substance to form weapons and trap opponents.
* AdaptationalHeroism: The original Kevin was an AxCrazy EnfanteTerrible, whereas this one is mostly a bully and is capable of being reasoned with, even helping Ben and Gwen out on occasion. He still shows a willingness to kill Ben, but ''only'' Ben.
* AdaptationalIntelligence: The old Kevin was a good mechanic as a teenager; ''this'' Kevin, as an 11-year-old no less, is able to build a device similar to the Omnitrix following a dream he had.
* AdaptationalJerkass: But by the same token, the original Kevin's villainy resulted from a combination of [[FreudianExcuse being bullied and treated as a freak due to his powers]] and [[ThisIsYourBrainOnEvil a side effect of his powers making him psychotic when misused]]. This version of Kevin doesn't have any insanity-causing power, instead using his own Omnitrix, and he ''is'' himself a petty bully who takes pleasure in inflicting misery to others.
* AdaptationalSuperpowerChange: Instead of absorption powers, he wields a knock-off Omnitrix.
* AdaptationalWimp: [[DownplayedTrope A minor example]], he lacks his powers from the Classic Continuity, but unfortunately for Ben, [[GadgeteerGenius that doesn't mean he isn't a threat]].
* AntiVillain: He's not without his better qualities, and even at his worst one can certainly understand the pain that is motivating his actions.
* AscendedExtra: Somewhat {{Downplayed}}. While the Classic Kevin 11 was an important villain, he didn't necessarily appear too often, contrary to how some older fans might remember it. Even his final appearance was just a quick cameo in Ben's dream. In the reboot, however, he has now topped Vilgax as the most [[SpotlightStealingSquad frequently recurring antagonist]], making at least 32 episodic appearances and appearing in TheMovie. The higher-ups demanding 12 extra episodes featuring Kevin in Season 3 only further emphasize this trope. This oversaturation is somewhat fixed in Season 4, where several of his appearances are quick cameos and he generally doesn't have much substance to his appearances outside of the GrandFinale [[TheMovie movie]].
* ArchEnemy: He considers himself this to Ben.
* BerserkButton: Kevin gets ''very'' angry in "Introducing Kevin 11" when Ben points out that he, unlike Kevin, at least ''has'' people he can run to for help. His lack of friends or attentive family members clearly hurts him more than he lets on.
** In general, he hates being reminded he's alone. Say the wrong thing about his situation, he can go anywhere from defensive to outright attacking anyone who crosses his path. He also doesn't like being compared to Ben.
* BigBadEnsemble: With the Forever Knight in Season 3 after refusing [[WeCanRuleTogether his offer to join him]]. [[spoiler:At least until "Introducing Kevin 11", where he officially joins him due to [[GreenEyedMonster his jealousy towards Ben]].]]
* BodyHorror: In "Which Watch" Charmcaster uses a spell on his Antitrix, causing the device to use the DNA of all the 11 aliens on Kevin and mutating him in a grotesque amalgam of body parts, just like the Kevin from the original series.
* TheBully: He was Ben's worst bully at school, even worse than Cash and JT.
* CharacterDevelopment: In Season 4, while he's still TheRival to Ben, he's become a lot more mellowed out in his demeanor after [[spoiler:returning from being lost in the timestream for a long time]].
* CompositeCharacter: His appearance takes after Kevin from the original series and his role as Ben's Omnitrix-wielding rival takes after Albedo. He also is now in the role of Ben's old school bully previously filled by J.T. and Cash. The dynamic being developed between him and the Forever Knights also calls to mind Kevin and Servantis' dynamic from ''Omniverse''.
** WordOfGod is that his versions of Ben’s aliens are this with other Omnitrix aliens from the classic continuity, though the exact hybrids are unknown.
* DemotedToDragon: Eventually joins the Forever Knight.
* DemotedToExtra: Kevin was so important to Season 3 that additional episodes were ordered for it under the mandate that he be included in them. In Season 4, he doesn't make nearly as much appearances, and a few that he does are just brief cameos. He does have a major role in TheMovie serving as the season's finale, though.
* EasilyForgiven: [[spoiler:Beyond their childish EvilerThanThou rivalry, Charmcaster works together fine with Kevin in "Roundabout", never bringing up that he was inadvertently the one who destroyed her spellbook in "Which Watch" or that he caused her defeat in "What Rhymes with Omnitrix?". Even him destroying her new power source just gets her comedically miffed rather than truly angry.]]
* EnemyMine: There are many instances of it in the extra ordered episodes of Season 3, and in "Roundabout: Part 2", [[spoiler:he ultimately teams up with Ben and Gwen against the Forever Knight when he realizes that their personal interests are incompatible and that the Forever Knight never truly believed that he was stronger than Ben. It also happens in Season 4, with Kevin more open to it at this point.]]
* EvilCounterpart: Once again is this to Ben, this time with his own Omnitrix.
* EvilerThanThou: He and Charmcaster seem to have a mild rivalry concerning this, with both insisting that they are the more capable villain.
* GeniusBruiser: Apparently, he is a skilled mechanic, seeing as he was able to create the Antitrix.
* GreenEyedMonster: "Introducing Kevin 11" reveals that part of his hate for Ben comes from the fact that Ben has a supporting family, unlike him.
* HeelFaceRevolvingDoor: Following the originally ordered episodes of Season 3 where he was part of a BigBadEnsemble, the extra ordered episodes of Season 3 revolve around Kevin's constantly flip-flopping morality as he begins falling between being an AntiHero and being an AntiVillain. By Season 4, though, he's more of a solid AntiHero who [[TheRival simply insists on not getting along with Ben and trying to beat him at everything, including heroism.]] [[spoiler: This status persists even in Ben 10,000's future, where his insistence on competing with Ben causes him to get permanently stuck in an alien form of his own making but he is still willing to join fights for the greater good.]]
* HeroicSacrifice: [[spoiler:Allows himself to get lost through time in order to defeat the Forever Knight and allow Ben and Gwen to return to the present in "Roundabout: Part 2".]]
* HybridMonster: WordOfGod is that all of Kevin’s Antitrix aliens are mixes of two different species, presumably due to the Antitrix being a FlawedPrototype.
* {{Hypocrite}}: In "Which Watch", Kevin dismisses Charmcaster's petty grudge against Gwen as "stupid drama". All while continuing to take his own petty grudge against Ben completely seriously.
* ISurrenderSuckers: In "Buggy Out" he found himself being overwhelmed by Rath, so he pretended to surrender (as well as sweet-talking Ben), before sucker-punching him with Hot Shot's flame.
* {{Jerkass}}: He loves to make people miserable ForTheEvulz. As the show goes on, he swings between JerkWithAHeartOfGold and JerkWithAHeartOfJerk regularly.
* LackOfEmpathy: While not the sociopath that his Original Series counterpart was, this Kevin still suffers from this. The show's staff have said that this is the main thing setting Kevin apart from Ben: Ben will feel regret when he's messed up and apologize for it, whereas Kevin is largely incapable of doing the same.
* MistakenIdentity: Because of his watch, expect someone to mistake him for Ben or a relative of his. Taken up to [[JustForPun eleven]] when he and Ben lose memories and swap phones, leading them to read each other's diaries and think they're each other.
* MythologyGag: At the end of "Which Watch", Ben says "Way to go, team!" to himself, Gwen and Kevin, who were a team in ''Alien Force'' and ''Ultimate Alien''. Cue Kevin angrily shoving Ben away, insisting they are ''not'' a team and that he'll be back to destroy him later. [[spoiler:Happens again in "Roundabout: Part 2", where despite working with them and making a HeroicSacrifice for them, he insists that he is still their enemy and will ultimately be the one to destroy them.]]
* NoGoodDeedGoesUnpunished: In TheMovie, he comes the closest to a full-on HeelFaceTurn as he has ever had. As a result, he gets put through the wringer over and over again, and having his fears of inadequacy especially when compared to Ben reinforced stronger than ever before.
* NominalHero: Many times in the additional episodes ordered for Season 3, he ends up playing the hero either against his will or because he has a selfish objective to be gained in doing so.
* TheOnlyOneAllowedToDefeatYou: He's furious when Charmcaster controls him to try to kill Ben in "Which Watch", because if it's under her control then it doesn't really count as ''him'' getting to do it. [[spoiler:He also protests her trying to kill Gwen in "Roundabout" by saying that if anyone gets to kill her, it'll be him, although in this is just a cover for his PrecociousCrush on her.]]
* ParentalNeglect: He is the victim of this, as shown in "You Remind Me of Someone".
* PetTheDog: He helps Ben and Gwen in "Franken-Fight", even parting ways with them on peaceful terms for once.
** He also ends up working together with Ben in "Four by Four", even [[TakingTheBullet taking a laser tag bullet for him]], although he insists it was for just his own benefit.
** At the end of "Introducing Kevin 11", he helps Ben save innocent people from a collapsing building since he doesn't want people not involved in he and Ben's feud to get hurt (hence why he knocks the building onto Ben once the people are safe).
* PrecociousCrush: As shown in "Franken-Fight", he has a one-sided crush on Gwen. As we see later on, [[SheIsNotMyGirlfriend he vehemently denies it]] in front of either of the Tennyson cousins.
* RedemptionEqualsDeath: [[spoiler:Well, in this case it equals getting lost in a time portal, and he stubbornly insists it isn't a redemption. And he was right, as he finds his way back to the present in Season 4 and goes right back to causing trouble, albeit with less intense of an attitude as he had before.]]
* RedemptionRejection: Like in the original show, he does this frequently, as his stubborn pride and hatred of Ben is just too strong. [[spoiler:He even makes a HeroicSacrifice while still insisting he's "the baddest around".]]
* RememberTheNewGuy: He is introduced as someone Ben knows from school, but neither Gwen nor the audience are familiar with.
* TheRival: To Ben. He is even described as such in official material.
* RunningGag: Some season 3 episodes has some of the villains describe him as "emo Ben" due to having a watch with aliens like Ben but being overall DarkerAndEdgier, much to Kevin's chagrin.
* ShoutOut: Now that he has been fleshed out more as a rival to Ben rather than a legitimate villain, the dynamic between the two is quite reminiscent of Bugs Bunny and Daffy Duck.
* SheIsNotMyGirlfriend: If anyone dares to suggest that he has a crush on Gwen, which he does, he will swear up and down that he doesn't.
* SourOutsideSadInside: He may be a {{Jerkass}} bully, but deep down he's also a lonely kid.
* SurprisinglyRealisticOutcome: He may be Kevin, but he's still a kid, and so acts accordingly:
** He's upset when he hears his favorite cartoon is getting canceled and overreacts.
** Attacks an amusement park for toddlers solely because nobody ever took him there before.
** Does pranks for attention (albeit often to EnfanteTerrible levels) and likes playing Laser Tag.
** Has a PrecociousCrush on Gwen, another clever kid from his age range.
** That aside, him inventing the Antitrix (a manmade knockoff of the Omnitrix using garage parts) means he can customize it to have stronger forms, change whenever he wants to and stay transformed longer. But, as even the actual Omnitrix isn't flawless, he's prone to a more sensitive device, instable forms occasionally and inconsistent transformation time, such as when Ben lasted longer than he did when he transformed ''before'' Kevin. Because of that, his watch needs constant tuneups to stay functional.
* TroublingUnchildlikeBehavior: While not AxCrazy in general like in the original show, this version of Kevin has still made it clear that he'd have no qualms killing his rival Ben. He also claims he'd be fine killing Gwen, but in that case [[SheIsNotMyGirlfriend he's obviously in denial]].
* {{Unishment}}: [[spoiler: In ''Ben 10,010'', continuing to tamper with alien DNA in order to one-up Ben caused him to become trapped in the form of Humangoraptor, his answer to Ben's Humungosaur form, for several years, with no clear endpoint in sight. But given that this mean's he's now a giant, super-strong humanoid dinosaur, Kevin isn't exactly bothered by his condition.]]
* UngratefulBastard: A recurring trend with him is that any time Ben helps him or saves his life, it only makes him hate Ben ''more'' because he can't stand seeming weaker than him. The most blatant example is in "Buggy Out", where Ben saves Kevin from the angry Forever Knight, only for Kevin to willingly go back to the Knight at the end of the episode and offer up a way to use Ben's beloved family members against him.
* UnManlySecret: “Xingo-Nation” reveals that he’s a fan of [[ShowWithinAShow Lucky Girl]], though he doesn’t like people to know that.
* UnskilledButStrong: His modifications to his alien forms makes them more powerful, but Kevin still needs more practice. Likewise with his aliens; they do have additional features and strengths the originals don't but they also come with a drawback of not being that alien. Dark Matter for instance is much stronger than Grey Matter, but it's not quite as smart, and its larger size makes it easier to hit compared to Grey Matter.
* UnwittingPawn: [[spoiler: To Vilgax. The dream showing him how to build the Antitrix was sent to him by Vilgax, and Vilgax always intended to take it from him once he escaped the Null Void.]]
* VillainsOutShopping: In "Four By Four" he simply wants to enjoy a good game of Lazer Tag. It takes him a while to convince Ben he is not stalking and planning to attack him for once. This kind of incident happens more often with him in the additionally ordered episodes of Season 3, and a few in Season 4.
* WildCard: He can cause trouble, help to fix trouble, or both in any given order. Ben even lampshades in "Bottomless Ben" it by saying he will never be able to understand Kevin given how much his behavior keeps changing.
* WouldHitAGirl: As we see with his fight with Gwen in "Roundabout", he doesn't discriminate by gender when it comes to how ruthless he can be in dealing with his opponents. He also attempts to fight Charmcaster alongside Ben in "What Rhymes with Omnitrix?", but it [[CurbStompBattle doesn't go well for them]].
* YouAreBetterThanYouThinkYouAre: Gwen and Grandpa Max tell him this in TheMovie to convince him to help them.
[[/folder]]
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[[Characters/Ben10MainCharacters Main Characters]] ([[Characters/Ben10BenTennyson Ben Tennyson]], '''Kevin Levin''') | [[Characters/Ben10OmnitrixAliens Omnitrix Aliens]]\\
Villains premiering in: [[Characters/Ben10VillainsOriginalSeries The Original Series]] ([[Characters/Ben10Vilgax Vilgax]], [[Characters/Ben10ForeverKnights Forever Knights]]) | [[Characters/Ben10VillainsAlienForce Alien Force]] | [[Characters/Ben10VillainsUltimateAlien Ultimate Alien]] | [[Characters/Ben10VillainsOmniverse Omniverse]] | [[Characters/Ben10VillainsSpecials The Specials]] | [[Characters/Ben10Villains2016Series The 2016 series]]\\
[[Characters/Ben10SupportingCharacters Supporting Characters]]-]]]]]
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!!Kevin 11 (Kevin Ethan Levin)
->'''Voiced by:''' Creator/MichaelReisz (first appearance), Creator/CharlieSchlatter (remainder of Original Series), Creator/GregCipes (''Alien Force'' onwards), Creator/YuriLowenthal (''[[VideoGame/CartoonNetworkPunchTimeExplosion Cartoon Network Punch Time Explosion XL]]'')
The supervillain alter-ego of Kevin Levin, Ben's original EvilCounterpart and [[ArchEnemy second major nemesis]]. An 11-year-old boy Ben befriends in New York City, Kevin seems like your average street kid delinquent, but actually has superpowers that allow him to absorb energy. After revealing himself to be a disturbed sociopath, Kevin absorbs the power of Ben's Omnitrix, which backfires on him when it eventually mutates him into a hideous amalgamation of all 10 of Ben's aliens. Now dubbing himself "Kevin 11", he is obsessed with getting {{Revenge}} on Ben.
Following the TimeSkip 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 ConMan. 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 LoveInterest.
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[[foldercontrol]]
[[folder:Original Series]]
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/kevin_e_levin.png]]
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/kevin_11.png]]
-->''"[[TheReasonYouSuckSpeech You'll never beat me, because you're]] [[TheCape one of those good guys]]. [[ThouShallNotKill And good guys never have the guts to finish guys like me]]!"''
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* AbusiveParents: Implied to have them, as he claims they threw him out due to his powers. [[spoiler:''Ultimate Alien'' reveals this to be untrue; his mother and stepfather didn't kick him out. He went insane after absorbing energy and demolished their house, and [[SelfServingMemory his insanity caused him to remember things differently]].]] He's also an abusive father to his son Devlin as Kevin 11,000 in the future.
* AllYourPowersCombined: {{Downplayed}}. He absorbed the powers of Ben's original 10 aliens, but none of his additional forms such as Cannonbolt or Wildvine. This also serves as a bit of an InformedAbility considering we never see him using the abilities of Grey Matter, Upgrade, or Ghostfreak. It's also worth mentioning that his powers function at 10% of the strength of the original (which may justify the "absence" of Grey Matter in particular from Kevin's demonstrated abilities, as 10% of a genius wouldn't amount to much of a difference for Kevin). Although thanks to Ben's advice during the ChainedHeat episode, Kevin learns that he can combine various abilities to increase their efficiency.
* AntiVillain: He could be considered a very rough Type II. WordOfGod is that [[https://68.media.tumblr.com/9270f5ca74f393cee1cca0cc15dced47/tumblr_oac430oTSl1sdo9gko1_500.png he was always meant to develop]] into more of an AntiHero overtime.
* ArchEnemy: To Ben during the original series. He was the second most dangerous and personal, preceded only by Vilgax. Notably, he stayed that way in the Ben 10,000 future (as shown in the Original Series episode "Ken 10") before reforming (as revealed in the ''Omniverse'' episode "The End of an Era").
* ArtificialHybrid: Once Kevin starts absorbing energy from the Omnitrix aliens, he becomes a hybrid of whatever form Ben takes at the time, such as Heatblast and Fourarms in his debut episode. It gets taken further as Kevin 11, where he's now a chimeric mutant with the combined [=DNA=] of all ten of Ben's aliens.
* AxCrazy: In his first appearance alone, without gaining any of Ben's power, he plans to crash trains into each other to take valuables from the people that will be killed.
* BarbarianLongHair: He sports an impressive black mane, which is the only thing recognizable when he turns into a mutant alien. It really emphasizes his savage nature.
* BerserkButton: What gets Kevin to snap and mutate out of control is Ben telling him he's NotWorthKilling and never was.
* BigBad: Of season 2 of the Original Series, though [[spoiler:he [[BigBadDuumvirate shares the position with Vilgax in the season finale]].]]
* BlessedWithSuck: Kevin's energy-absorbing powers are useful, but also incredibly destructive and earn him the fear of those around him. It gets worse when he absorbs the Omnitrix's powers, as he can't shift into a human for long and eventually gets stuck as a monstrous alien hybrid.
* BloodKnight: He seems to feel right at home on the Megacruiser, openly enjoying the gladiator-style battles a lot more than Ben.
* BodyHorror: The partial transformations he gets as a result of absorbing some of the Omnitrix's energy are not pretty to look at.
* BladeBelowTheShoulder: He often morphs his Diamondhead arm into a blade, which he notably uses to gut Slix Vigma.
* ChaoticStupid: As a kid, though he has some moments of actual planning. Kevin 11,000, however, was more calculating before his reform into a good guy.
* ContrastingSequelAntagonist: To Vilgax. Both serve as Ben’s most personal enemies and both want the power of the Omnitrix. But while Vilgax is an alien who wants to use the Omnitrix to create an army of aliens and conquer the universe, Kevin is a human who absorbs the power of the Omnitrix which transforms him into a mutated abomination who wants to kill Ben and his family.
* CreepyChild[=/=]EeriePaleSkinnedBrunette: A dark-haired, black-wearing kid living on the street despite being 11 years old, prone for {{Slasher Smile}}s, with destructive electrical powers and [[TroublingUnchildlikeBehavior disturbing levels of psychosis for his age]]. And this is all ''before'' he starts physically mutating.
* DarkIsEvil: His alien transformations in ''Framed'' all have a darker color scheme than Ben's.
* DisneyVillainDeath: His apparent demise at the end of "Framed". Unsurprisingly, he survived.
* DumbMuscle: Despite supposedly having all of the Omnitrix's powers, he hardly ever uses them to their full potential. He's still a brash, ill-tempered little kid, so his answer to practically everything is brute force.
* EnergyAbsorption: His basic power allows him to absorb and redirect energy, as seen with the common source of energy in electricity. Once he starts absorbing energy from Ben's aliens due to the Omnitrix, he gains part of their abilities in the process. [[spoiler:''Ultimate Alien'' reveals that [[WithGreatPowerComesGreatInsanity it also has the sad side effect of making him go more and more nuts]].]]
* EnfantTerrible: He is only one year older than Ben, yet he rivals ''Vilgax'' as one of the most psychotic villains in the show.
* EnhancedPunch: [=XLR8=]'s speed + Four Arms' strength + Diamondhead's durable fist = "one mean punch".
* EvilCounterpart: He's a lot like Ben, but without ''any'' of his morals or standards. He even gets a NotSoDifferentRemark from Ben himself once his mind is set upon crashing the trains.
* EvilLaugh: He lets out an absolutely chilling one at the end of his debut appearance once he realizes that he's successfully absorbed all of Ben's powers.
* EvilMakesYouMonstrous: While Ben's alien alter-egos are usually bizarre to look at, Kevin's mutation is positively grotesque, an abomination cobbled together from bits of DNA he absorbed.
* EvilWearsBlack: His clothing from his original human form is black.
* FalseFriend: To Ben in his debut episode. Kevin first meets Ben by using his powers to give him some coins to play the arcade games and for the first half of the episode, the two of them bond over the need for freedom and to be unrestrained by the strict rules, and eventually became "friends" after Ben reveals his powers to Kevin. Then came Kevin's "plan" to steal money by causing a train wreck...
* FamilyUnfriendlyDeath: Gives one to Slix Vigma [[ImpaledWithExtremePrejudice by impaling him with his Diamondhead arm]]...and if Ben hadn't gone Cannonbolt, he would have been next.
* FrameUp: In his second appearance, Kevin is able to shapeshift into the aliens of the Omitrix. He uses this power to commit a crime and frame Ben's alien forms for the deed to ruin Ben's reputation.
* FreudianExcuse: Everyone treated him like a freak and a monster because of his powers, so the unstable kid basically decided to do his damnedest [[ThenLetMeBeEvil to prove everyone right]].
* FromBadToWorse: Kevin started out as a small-time, albeit horrendously amoral delinquent with strange powers. Then he gets a taste of the Omnitrix and starts wreaking havoc on a larger scale. Then he mutates into a monstrous combination of all 10 aliens and becomes a savage, inhuman beast driven by his hatred for Ben.
* GoodScarsEvilScars: Kevin 11,000 has an X-shaped scar on his chin.
* HairTriggerTemper: Especially after being trapped in chimera form. He's almost perpetually in a blind rage and very unreasonable to work with for both Ben and later Vilgax.
* HumanoidAbomination: As Kevin 11,000 he is capable of turning back to his human form, but still possesses all the alien abilities he absorbed, and is capable of turning into one creepy OneWingedAngel form.
* ImposterForgotOneDetail: After absorbing the Omnitrix and being capable of transforming into the original 10 of Ben's alien forms, Kevin's transformations are practically [[IdenticalStranger identical]] to Ben's but with a darker color scheme and lacking the Omnitrix symbol. {{Subverted|Trope}}, however, as nobody notices this in ''Framed'', not even Gwen and Grandpa Max.
* InferioritySuperiorityComplex: He is arrogant and likes to say that he's the best, but his anger at people mocking him or calling him a freak exposes his insecurity. Kevin 11,000 on the other hand, does not seem to have such insecurity, outright saying he knows he's the best and is only attacking Ben and his family because he ''likes'' it.
* InformedAbility: He boasts that his mutant form has all of Ben's ten original alien powers, plus his own energy absorption ability, hence the nickname "Kevin 11". In practice, however, he was never seen using his energy absorption power in this form, nor the abilities of Grey Matter, Ghostfreak, and Upgrade.
* {{Jerkass}}: As he becomes more powerful, Kevin also becomes much more of a petty, bullying prick toward Ben. He frames Ben for his own crimes, mocks his attempts to reason with him, and spends as much time as he can treating the kid like garbage when they're chained together on the Megacruiser.
* JerkWithAHeartOfJerk: He milks sympathy from Ben in his debut, only to pull a RedemptionRejection afterward.
* LackOfEmpathy: His response to being called out for potentially killing hundreds of people just to grab some quick cash? "No pain, no gain."
* LightningBruiser: He has access to [=XLR8=]'s speed (albeit he doesn't master it as well) plus the physical strength of Four Arms.
* LoopholeAbuse: The reason he can absorb Ben's alien forms in his debut episode? Because the Omnitrix gives off energy in the form of ''pure'' alien [=DNA=].
* LovecraftianSuperpower: Absorbing energy from an alien allows him to acquire its power, but has the side effect to turn him into a disturbing hybrid of said alien and himself. Absorbing energy from the Omnitrix itself eventually causes him to turn into a ''very'' disturbing amalgam of ''all'' aliens.
* MagicPants: Zig-zagged. When he transforms into versions of Ben's aliens, his clothes change with him, even becoming Ben's clothes at times(though this might be because Ben's data was programmed into the Omnitrix). Yet when he mutates into his chimera form, his clothes clearly shred and he's shirtless the rest of his appearances. This is mostly averted as an adolescent but used again as Kevin 11,000.
* MasterOfNone: As Kevin 11, he has the powers of all 10 of Ben's original alien forms, but they are diluted and only a fraction of what they should be. During a brief EnemyMine team-up with Ben, he learns to compensate for this by using multiple powers at once, in combinations that Ben isn't capable of.
* MirrorCharacter: Part of his introduction. Just like Ben, he is a kid with powers [[ScrewTheRulesIHaveSupernaturalPowers who is not afraid to use them to screw the rules]]. [[{{Foil}} The difference is]], Ben is genuinely [[ChronicHeroSyndrome altruistic]] and has some standards, while Kevin is a sociopath with no scruples or empathy whatsoever.
* MultiArmedAndDangerous:
** "Tetramand Kevin" is closer to a Tetramand than a hybrid (completed with ''six arms'') and he's capable of giving Fourarms a tough time until the latter starts getting serious when the Omnitrix is about to tap out.
** His current mutated form has multiple arms like Four Arms, but one is Diamondhead's, another is Heatblast's, and two are Wildmutt's. He is also stronger than Four Arms, which makes sense as Fourarms body shape serves as the base for the combined DNA of Ben's other 9 alien forms.
* NeverMyFault: He blames Ben for his mutation, even though technically, ''he'' was the one who tried to mess with the Omnitrix in the first place. He also blames Vilgax when the two become trapped in the Null Void, even though Kevin was the one who betrayed Vilgax.
* NeverSayDie: An odd quirk of Kevin's is that for how hellbent he is on killing Ben, he avoids saying explicitly so. Instead, he uses "wax" or "kick your butt." This might be because he's still a child trying to sound cooler than he actually knows how.
* NotWorthKilling: Ben tells him this word for word after defeating him for the second time. Unfortunately, this causes Kevin to lose all control of his anger and hate as well as his control over his powers, turning him into a chimera made from Ben's aliens.
* OffscreenMomentOfAwesome: He apparently defeated Technorg and took over the Megacruiser ''all by himself''. By the time he finds Vilgax, he's also been to various worlds and endured many offscreen fights.
* SanitySlippage: While Kevin was never a very stable boy, he was more rational when Ben met him and didn't try anything seriously destructive until he saw what the Omnitrix could do. After taking the watch's power, he physically and mentally devolves into a brutal, unhinged monster, flying off the handle constantly and savagely attacking anything in sight. The later series would provide a more detailed explanation for this.
* ShapeShifterMashUp: It happens whenever he absorbs Ben's powers, as he can't maintain control over the transformations the way the Omnitrix can.
* SimpleYetAwesome: His only noteworthy power that surpasses Ben's transformations as Kevin 11 is his SuperStrength (he boasts that he still has his EnergyAbsorption power, but it's more of an InformedAbility), given that he has Fourarms' body shape serving as the base while his other alien powers are only 1/10 as strong as the originals. Then again, in the hands of a perpetual, homicidal raging delinquent, it works just fine. ''Especially'' when he starts combining his other, weaker alien powers to complement his physical strength.
* PetTheDog: In his first scene, he steals a bunch of tokens for Ben when the latter doesn't have money for the arcade. And this was before learning what the kid really was. Sadly, any shred of human decency is lost on him as he gets to know Ben better, and it takes a long, long time for him to gain it back.
* RedemptionRejection: After defeating him for the first time, Ben offered to help reform him and get people to like him, even offering him a spot as an ally. Kevin seemingly accepted… only so he could get close enough to try and take the Omnitrix.
* TheRival: To Ben, even after his HeelFaceTurn in ''Alien Force''.
* {{Sadist}}: Referred to as one by Slix Vigma in the ChainedHeat episode.
* SlasherSmile: His most frequent expression.
* TheSociopath: He has a complete LackOfEmpathy for anyone else and takes pleasure in inflicting pain onto others.
* ThenLetMeBeEvil: "If they thought I was a freak before, ''just wait''."
* TroublingUnchildlikeBehavior: In his introduction episode, he attempted to provoke an underground bus accident that would cause many people to die just so he could take money and valuables on their bodies. In alien and mutant forms, he is frequently shown trying to kill people in gruesome ways, typically using Diamondhead's BladeBelowTheShoulder, all while [[SlasherSmile smiling gleefully]]. Keep in mind that at the time, Kevin was ''11 years old''.
* TookALevelInBadass: As Kevin 11,000, he's not only more powerful but a lot calmer and more calculating than his psychotic but immature kid self.
* TookALevelInKindness: Granted, we don't see it progress until much later, but his time in the Null Void and his chance friendship with Kwarrel helped restore his humanity both figuratively and literally.
* UnexplainedRecovery: During the third time he shows up (despite apparently being killed previously), his explanation of how he survived boils down to this, as well as a recap of what happened last time. He doesn't actually use the phrase, but it's implied.
* UngratefulBastard: When Ben spared him in the original series, Kevin snaps and transforms into a hideous chimera of Ben's aliens.
* UnskilledButStrong: After accidentally absorbing a sufficient amount of [=DNA=] of the 10 original aliens from the feedback pulse emitted from Ben's Omnitrix, Kevin essentially becomes a ''living'' version of the Omnitrix himself. However, he has little control over his stolen 10 alien transformations compared to Ben's Omnitrix as seen in ''Framed''; he can't revert back to his human form nor stay as a human for long (ironically the opposite to Ben), but is capable shifting into a different alien form relatively quickly and without the drawback of timing out like Ben's Omnitrix. In the same episode, he eventually becomes human again after overusing his alien transformations by shifting between them constantly for a while. This eventually gets deconstructed as his lack of control over his energy absorption powers, the stolen alien [=DNA=] still inside of him, and the anger he feels from Ben sparing him and telling him that he's NotWorthKilling, permanently mutate him into Kevin 11.
* VillainForgotToLevelGrind: Downplayed example in "Grudge Match", where he boasts that he knows all 10 of Ben's aliens and as such nothing Ben can do will surprise him. Unfortunately for him, Ben had acquired Cannonbolt in between.
* WalkingShirtlessScene: As Kevin 11, his only clothes are his cargo shorts.
* WeakButSkilled: His powers as Kevin 11 are only a tenth as efficient as Ben's (though he's stronger than Fourarms) but he can combine them to overwhelm his opponents.
* WoobieDestroyerOfWorlds: Implied in "Framed." When Ben calls him out on risking the lives of innocent people just to get back at him, Kevin responds as follows:
-->'''Kevin:''' ''Nobody's'' innocent! They just haven't had a chance to make fun of me yet!
* XMarksTheHero: Inverted with Kevin 11,000: despite being a complete asshole and unrependent, he sports this scar on his chin.
* YoungerThanTheyLook: After his transformation, he's an 11 year old kid in the body of a hulking chimeric alien, much like Ben in his adult-like alien forms.
[[/folder]]
[[folder:''Alien Force'' & ''Ultimate Alien'']]
[[quoteright:248:https://static.tvtropes.org/pmwiki/pub/images/kevin_levin_ultimate_44.png]]
* AntiHero: Though he fights for good, his checkered past makes him a great deal shadier than Ben and Gwen and willing to make deals with criminals such as Argit and Vulkanus to help in their missions. He's also dead set on murdering Ragnarok to avenge his dead father.
* ArbitrarySkepticism: 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. This seemed to fade over time. During "In Charm's Way," he told Charmcaster (disguised as a girl named Caroline) that Gwen was "made of magic."
* TheAtoner: He officially becomes this after seeing Magister Labrid die and turns over a new leaf as a promise.
* BeyondRedemption: Near the end of season 1, when he's remutated by absorbing energy from the Ultimatrix to defeat Aggregor. The result: Kevin becomes an AxCrazy PowerParasite who goes on a rampage absorbing the powers of everyone he comes across. After trying to reason with him and failing, Ben eventually becomes convinced that Kevin's too far gone and they have to [[ShootTheDog put him down]]. When Gwen approaches Grandpa Max for help on the subject, she's shocked when Max agrees with Ben's approach, despite admitting that [[OOCIsSeriousBusiness he never thought Ben would go that far]].
-->'''Ben''': He's never gonna stop- unless ''I'' stop him. For good.
* BigBad: Is driven insane by absorbing Aggregor's powers in the first season of ''Ultimate Alien''.
* TheBigGuy: He serves as the muscle on Ben's Team and has a tendency to act before thinking.
* BodyHorror: 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'', 4th in ''Omniverse''). He manages to revert back to normal as each series progresses.
* BookDumb: 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.
* BrilliantButLazy: He has a very laidback approach to life and could probably do a lot better if he put in some effort. In ''Omniverse'', he does just this and manages to get a paying job.
* CoolCar: His green sports car is the signature vehicle of the ''Alien Force/Ultimate Alien'' era, and is constantly being updated with Plumber tech and criminal tech alike. It also tends to get [[ChronicallyCrashedCar destroyed a lot in battle]], much to Kevin's chagrin.
* DarkIsNotEvil: Starting with ''Alien Force'', he pulls a HeelFaceTurn despite his DarkAndTroubledPast and mainly black color scheme.
* DeadpanSnarker: Even in a trio where all three members are snarky teenagers, Kevin is easily the biggest one of the three and drops sarcastic comments at nearly every opportunity. His dry sense of humor is actually the main source of comic relief throughout ''Alien Force'' and ''Ultimate Alien''.
* DisappearedDad: Devin Levin. KIA, courtesy of Ragnarok. Or so we are led to believe. ''Omniverse'' retconned Devin Levin into a false memory implanted by Servantis to manipulate Max into watching over Kevin. The identity of Kevin's father is unknown; though a photograph of Devin does suggest that he was a real person, the explanation for his disappearance is most likely far more [[AmbiguouslyAbsentParent mundane.]]
* DistressedDude: He tends to get captured on occasion due to now being the weakest of the group.
* DitzyGenius: While being an expert in mechanics and alien tech, he's clueless and naïve when it comes to subjects here on Earth.
-->'''Gwen:''' If it isn't about his car... excuse me, his "ride", or some alien tech, he's pretty much oblivious.
* DueToTheDead: His HeelFaceTurn was influenced in part by his improved mental state, but the thing that kickstarted it was wanting to honor Magister Labrid's HeroicSacrifice.
* TheEngineer: Serves as this role on the team, as he's the go to guy for alien-tech.
* EveryoneHasStandards:
** Despite being a staunch AntiHero who's done some shady things in his life, Kevin is so horrified when he witnesses Jarrett of the Pantophage eat the Tiffin that he actually ''faints''.
** In the sixth episode of ''Ultimate Alien'', Kevin backs out of freeing P'Andor from his suit when he realizes the amount of radiation he would be releasing would be incredibly deadly for Earth.
* FireForgedFriends: He goes from being one of Ben's worst enemies to one of his closest friends. As Ben puts it in the episode "Perplexahedron", Kevin went from the little kid trying to kill him every week to the older brother he never had.
* FreakOut: Kevin goes insane again in ''Ultimate Alien'' after absorbing the aliens in the Ultimatrix, nearly killing Aggregor and threatening to absorb the baby Celestialsapien for himself.
* GeniusBruiser: He is the team member who relies on brute force the most, and his powers enable him to gain SuperStrength and durability. However, he is also exceptionally knowledgeable about alien technology and is a GadgeteerGenius.
* HalfHumanHybrid: Half human, half Osmosian. This is a retcon from the original series, which intended for him to be a mutant. '' Omniverse'' goes closer to the intention from the original series by retconning Osmosians into being a human subspecies, not aliens.
* HeelFaceReturn: He's a small-time crook with [[JerkWithAHeartOfGold a heart of gold]] who is easily persuaded to join Ben and Gwen in the first episode of ''Alien Force'', which is a far cry from how he was when last left off in the original series.
* HeelFaceRevolvingDoor: 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 SeasonFinale.
* HeroicSacrifice: Non-fatal example. He saves the universe and defeats Aggregor, but at the cost of his sanity.
* HeroicWillpower: A flashback in ''Ultimate Alien'' reveals he had to concentrate to get back to normal from his transformation in the original series.
%%* {{Hypocrite}}: In ''Ultimate Alien'', a weird trend occurs where he starts being more distrustful and judgmental toward people who are either morally dubious or were evil and now trying to reform. Why this is hypocritical shouldn't have to be explained. Those in glass houses shouldn't throw rocks, Kevin! %% Huh? When did he ever do this?
%%* IfYouKillHimYouWillBeJustLikeHim: "Vendetta". [[spoiler:He doesn't listen. [[AssholeVictim Not that Ragnarok didn't deserve it, though]].]] %% Elaborate on the whole situation; separated, short sentences tell us nothing.
%%* IndyPloy
* JerkWithAHeartOfGold: He tries to keep up his ruffian attitude, but he has genuinely changed and is now a force for good.
* KnightOfCerebus: During the "Ultimate Kevin" arc, where he becomes one of the darkest villains and the show takes on a new level of seriousness. During this time he becomes a deranged, relentless, PowerParasite who absorbs the powers of everyone he comes across. Ben also displays a darker side where he becomes determined to [[ShootTheDog put Kevin down]].
* LongHairedPrettyBoy: His hair reaches his shoulders. By ''Omniverse'', it's a full-blown mullet.
* LovableRogue: Downplayed. He still gets involved with the criminal underground every now and then, but less and less as the series goes on. Still, even when he does, his charisma and wit almost always keep him entertaining.
%%* TheMcCoy
* MyNameIsInigoMontoya: [[ShoutOut Quoted verbatim]] against Ragnarok, who killed Kevin's now-retconned father. Then invoked a second time in ''Ultimate Alien'' for his old mentor Kwarrel.
%%* PayEvilUntoEvil: [[spoiler:Ragnarok.]]
* PunnyName: Kevin E. Levin can also be read as Kevin 11, his old supervillain name from the original series. Also doubles as RhymingNames if you don't count the "E".
* RedOniBlueOni: He's the red to both Ben and Gwen's blue, as the most hotheaded and aggressive member of the trio.
* RedemptionDemotion[=/=]RedemptionPromotion: Both at once! While he doesn't use the powers he had in the original series, and is the most likely of the trio to get [[TheWorfEffect beaten up in battle]], he's become smarter during the TimeSkip and continues to show it as he spends more time with Ben and Gwen. This especially shows halfway through ''Ultimate Alien'''s first season.
* ReformedCriminal: 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.
* TheResenter: 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 homelife... it'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.
* RoaringRampageOfRevenge: After being driven insane in ''Ultimate Alien'' he decides to go on one of these whenever he's not absorbing other people's powers.
* RunningGag:
** His [[ThePreciousPreciousCar precious precious car]] keeps on getting destroyed.
** [[CharacterCatchphrase "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 that he used an indestructible piece of Tetramand tech he got from his engagement with Princess Looma.
* SameCharacterButDifferent: It's hard to deny that Kevin is an entirely different character than what he was in the original series -- he went from being a sociopathic, sadistic monster to a shady and sarcastic but good-hearted JerkWithAHeartOfGold. Its to the point where his villainous persona has its own seperate page on this very site. ''Alien Force'' and ''Ultimate Alien'' go to great lengths to explain this drastic change, most notably through the reveal that Osmosians go insane when they absorb energy.
* SlasherSmile: When he's re-corrupted with energy in ''Ultimate Alien'', these return.
* ShapeShifterModeLock: Throughout ''Alien Force'''s third season, Kevin is trapped in a mutation made of various materials he had absorbed over the first two seasons.
* SpeedDemon: Kevin has shades of this from ''WesternAnimation/Ben10AlienForce'' onwards, where he is obsessed with his CoolCar which he modifies with alien tech to make it one of the fastest cars on the planet.
* SuperPoweredEvilSide: His energy-crazy persona comes off suspiciously like this. His personality reverts almost entirely to what it was as Kevin 11, as if they had different memories, and only comes out when he absorbs energy and becomes more superpowered.
* SuperPowerLottery:
** EnergyAbsorption: His original power. ''Ultimate Alien'' explains why he never uses it again after the original series.
*** ComboPlatterPowers: 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.
*** VoluntaryShapeshifting: Initially, when he absorbed energy from the Omnitrix the first time. [[ShapeShifterModeLock Didn't last however]]...
*** AllYourPowersCombined: 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.
** PowerCopying: He can also steal the powers of others, and integrate them into himself.
** MaterialMimicry: 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 Kwarrel.
*** SuperStrength: When absorbing tough materials like stone, steel, or Taydenite, his strength increases immensely. He once casually blocked a punch from ''Vilgax'', and in another episode, he picked up a car and hit a raging Ultimate Humungousaur so hard he went flying across the block.
*** RubberMan: He once turned his body rubber after touching the tires of his car.
*** MidseasonUpgrade: He gets shape-shifting powers in "The Vengeance Of Vilgax" that make him stronger, which he retains even after being restored to human form. It made a plot point in that if he hadn't got them as they'd have been unable to save the world from Hex. This ''really'' helps increase his usefulness to the team.
*** HealingFactor: It's revealed at one point that Kevin's armored form also has regenerative powers, much like Diamondhead. This comes in handy when he gets his arm cut clean off and is able to restore it in seconds.
* TallDarkAndHandsome: After the TimeSkip, Kevin has become a well-built, dark-haired pretty boy, who Gwen falls for almost as quickly as he does her.
* TallDarkAndSnarky: As stated above, teenage Kevin is tall, good-looking, and dark-haired. He's also the biggest DeadpanSnarker of the series.
* TeensAreMonsters: Inverted, he was evil as a child, but turned good after becoming a teenager.
* TokenEvilTeammate: Starts out as this in ''Alien Force'', getting involved in shady affairs with criminals and generally showing dodgy behavior, but he quickly grows past it.
* TookALevelInJerkass: In the third season of ''Alien Force'', Kevin is more of a jerk than usual. Much of this is caused by the {{angst}} of his new mutation, but there are also episodes that relapse him into his criminal past, such as when he profits off of a warring planet by selling them weapons.
* {{Tritagonist}}: He's the third member of the PowerTrio up until ''Omniverse'', and plays an incredibly important role in its dynamic.
* TroubledButCute: He starts ''Alien Force'' as a shady con artist with a lot to atone for, but Gwen can't help but be attracted to him anyway.
* {{Tsundere}}: Type A. He's hotheaded and {{angst}}y, and refuses to ask Gwen out despite their obvious feelings for each other. Fortunately, he does become more emotionally open by the second season.
* WhatTheHellHero: In "Hit'em Where They Live", when, Ben chastises Gwen for letting Zombozo's alliance kidnap his mother, Sandra when she was supposed to protect her. Kevin calls out on Ben's callousness when Gwen regrets failing to protect her aunt. Afterward, Ben backs down and apologizes to Gwen for his harsh behavior.
* WithGreatPowerComesGreatInsanity: Used in ''Ultimate Alien'' to rectify his extreme change in character as a kid. He falls off the proverbial wagon again later on.
* TheWorfEffect: He's usually always the one who gets his ass kicked the most in battle.
[[/folder]]
[[folder:''Omniverse'']]
[[quoteright:294:https://static.tvtropes.org/pmwiki/pub/images/kevin_x.png]]
----
* AbusiveParents: WordOfGod is that Kevin's real father was abusive towards him (like suggested in the original series), and that he ran away from him. After the Rooters were defeated, Kevin's memories of his real father returned.
* AntiHero: Kevin's still a hero at the end of the day, but his few focus episodes in ''Omniverse'' tend to focus on the darker parts of his past, such as his ConMan years with Argit and his history with the Rooters. "Many Happy Returns" also has him pawn off his engagement with Looma onto Ben with no remorse.
* BloodBrothers: With Ben, by his own admission towards Proctor Servantis.
-->'''Kevin:''' Ben's like a brother to me. Even when I don't deserve it.
* TheChewToy: Many of his appearances involve him getting injured... a lot. The ''Alien Force''/''Ultimate Alien'' era showed spades of this, but ''Omniverse'' really drove it home.
* ADayInTheLimelight: Even though he is less important than ''Alien Force'' and ''Ultimate Alien'', he has some episodes dedicated to him such as "OTTO Motives", "The Rooters of All Evil", "Weapon XI: Part 1", and "Weapon XI: Part 2" which he appears in the flashbacks and present.
* DemotedToExtra: Even when he does come back, he usually accomplishes even less than his ''Alien Force''/''Ultimate Alien'' self. For example, in "Showdown", his role in the whole episode consists in... befriending Khyber's pet. and in Mud Is Thicker Than Water he only makes a cameo appearance along with Rook who go to an auto show instead of helping Ben, Gwen, and Lucy with Pysphon and his thugs. However, he does have a few episodes focusing on him.
* DidntThinkThisThrough: In "OTTO Motives" both his car and Rook's truck got totaled in the fight between Ben and VillainOfTheWeek 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 choice 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 out, it'll be ''very'' hard to find a buyer for something that expensive.
** However, he eventually realizes he can transmute ''himself'' into taydenite, [[TakesOneToKillOne use his molded weapons to chip a bit off the car]], and use the bits as money.
* FakeDefector: Servantis notes he could never quite read or control Kevin's mind. Kevin uses this to his advantage by pretending to join him, then betraying him at the last second while freeing the Amalgam Kids from his control.
* FakeMemories: The Rooters are revealed to have implanted some in his head to get him close to Ben. One of these false memories is his Osmosian father, Devin Levin.
* {{Flanderization}}: His character design in this iteration takes the concept he had back in the original series (ruffian) and highlights it even more boldly through the fact that he now wears tattered clothes with eyeliner and looks like he just got back from a mosh pit show.
* GoodScarsEvilScars: Receives an X-shaped scar on his chin from being whipped by Swampfire. The same scar he had as Kevin 11,000 in the original series.
* HalfHumanHybrid: Retconned. He's not an alien at all, "Osmosians" are just humans with a unique genetic component (mutants) that gives them powers, Kevin's being energy/matter absorption.
%%* HeelFaceRevolvingDoor: While not so much in the present, WordOfGod explained this as to [[https://ask.fm/DerrickJWyatt/answers/120581521780 why, in the future, Kevin was on good terms with Ben in the finale]] despite the original Ben 10,000 future seeing Kevin as an irredeemable prick. %% See WeblinksAreNotExamples; it should mention evidence from the show, not the creator's remarks.
* ManchurianAgent: Proctor Servantis altered his memories to get him close to Ben.
* NeverMyFault: Seems to have developed this problem again. When Princess 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.
* NoYay: In-universe, this is his reaction to seeing Bullfrag flirting with Attea.
* OutOfFocus: He accompanies Gwen when she leaves Bellwood to go to college, thus is absent for most of the series.
* PutOnABus: In the first episode, Gwen leaves for college, and he leaves to live near the campus.
** NotAsYouKnowThem: 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.
* TomatoInTheMirror: He finds out that just about ''everything'' people know of him and what he knows of himself is wrong and based around false memories planted in him by Proctor Servantis of the Rooters. He naturally takes this pretty hard.
* TookALevelInDumbass: 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 ''The Frogs of War''.
* TookALevelInJerkass: Possibly, in an attempt of RevisitingTheRoots, ''Omniverse'' portrays him as more of jerk by revealing his backstory with Princess Looma and having him pulling out a BatmanGambit to get rid of her by giving her to Ben. Even ''Argit'' seems to think he exaggerates.
* UnwittingPawn: To the Rooters due to false memory implants. As it turns out, all of his CharacterDevelopment of growing to care for the Tennysons was a part of Servantis's plan, though it ultimately backfires on him now that Kevin and Ben are TrueCompanions.
* VitriolicBestBuds: Still continues this type of friendship with Ben. He's also this with Rook.
* XMarksTheHero: Ignoring the regression of becoming a jackass again, ''Omniverse'' shows how Kevin got this scar.
[[/folder]]
[[folder:Reboot Series]]
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/reboot_kevin.png]]
* AdaptationalBadass: Not him (see below), but the Antitrix's version of Grey Matter, Dark Matter: he is much taller than Ben's, strong enough to hurt Four Arms and capable to create some kind of crystal-like substance to form weapons and trap opponents.
* AdaptationalHeroism: The original Kevin was an AxCrazy EnfanteTerrible, whereas this one is mostly a bully and is capable of being reasoned with, even helping Ben and Gwen out on occasion. He still shows a willingness to kill Ben, but ''only'' Ben.
* AdaptationalIntelligence: The old Kevin was a good mechanic as a teenager; ''this'' Kevin, as an 11-year-old no less, is able to build a device similar to the Omnitrix following a dream he had.
* AdaptationalJerkass: But by the same token, the original Kevin's villainy resulted from a combination of [[FreudianExcuse being bullied and treated as a freak due to his powers]] and [[ThisIsYourBrainOnEvil a side effect of his powers making him psychotic when misused]]. This version of Kevin doesn't have any insanity-causing power, instead using his own Omnitrix, and he ''is'' himself a petty bully who takes pleasure in inflicting misery to others.
* AdaptationalSuperpowerChange: Instead of absorption powers, he wields a knock-off Omnitrix.
* AdaptationalWimp: [[DownplayedTrope A minor example]], he lacks his powers from the Classic Continuity, but unfortunately for Ben, [[GadgeteerGenius that doesn't mean he isn't a threat]].
* AntiVillain: He's not without his better qualities, and even at his worst one can certainly understand the pain that is motivating his actions.
* AscendedExtra: Somewhat {{Downplayed}}. While the Classic Kevin 11 was an important villain, he didn't necessarily appear too often, contrary to how some older fans might remember it. Even his final appearance was just a quick cameo in Ben's dream. In the reboot, however, he has now topped Vilgax as the most [[SpotlightStealingSquad frequently recurring antagonist]], making at least 32 episodic appearances and appearing in TheMovie. The higher-ups demanding 12 extra episodes featuring Kevin in Season 3 only further emphasize this trope. This oversaturation is somewhat fixed in Season 4, where several of his appearances are quick cameos and he generally doesn't have much substance to his appearances outside of the GrandFinale [[TheMovie movie]].
* ArchEnemy: He considers himself this to Ben.
* BerserkButton: Kevin gets ''very'' angry in "Introducing Kevin 11" when Ben points out that he, unlike Kevin, at least ''has'' people he can run to for help. His lack of friends or attentive family members clearly hurts him more than he lets on.
** In general, he hates being reminded he's alone. Say the wrong thing about his situation, he can go anywhere from defensive to outright attacking anyone who crosses his path. He also doesn't like being compared to Ben.
* BigBadEnsemble: With the Forever Knight in Season 3 after refusing [[WeCanRuleTogether his offer to join him]]. [[spoiler:At least until "Introducing Kevin 11", where he officially joins him due to [[GreenEyedMonster his jealousy towards Ben]].]]
* BodyHorror: In "Which Watch" Charmcaster uses a spell on his Antitrix, causing the device to use the DNA of all the 11 aliens on Kevin and mutating him in a grotesque amalgam of body parts, just like the Kevin from the original series.
* TheBully: He was Ben's worst bully at school, even worse than Cash and JT.
* CharacterDevelopment: In Season 4, while he's still TheRival to Ben, he's become a lot more mellowed out in his demeanor after [[spoiler:returning from being lost in the timestream for a long time]].
* CompositeCharacter: His appearance takes after Kevin from the original series and his role as Ben's Omnitrix-wielding rival takes after Albedo. He also is now in the role of Ben's old school bully previously filled by J.T. and Cash. The dynamic being developed between him and the Forever Knights also calls to mind Kevin and Servantis' dynamic from ''Omniverse''.
** WordOfGod is that his versions of Ben’s aliens are this with other Omnitrix aliens from the classic continuity, though the exact hybrids are unknown.
* DemotedToDragon: Eventually joins the Forever Knight.
* DemotedToExtra: Kevin was so important to Season 3 that additional episodes were ordered for it under the mandate that he be included in them. In Season 4, he doesn't make nearly as much appearances, and a few that he does are just brief cameos. He does have a major role in TheMovie serving as the season's finale, though.
* EasilyForgiven: [[spoiler:Beyond their childish EvilerThanThou rivalry, Charmcaster works together fine with Kevin in "Roundabout", never bringing up that he was inadvertently the one who destroyed her spellbook in "Which Watch" or that he caused her defeat in "What Rhymes with Omnitrix?". Even him destroying her new power source just gets her comedically miffed rather than truly angry.]]
* EnemyMine: There are many instances of it in the extra ordered episodes of Season 3, and in "Roundabout: Part 2", [[spoiler:he ultimately teams up with Ben and Gwen against the Forever Knight when he realizes that their personal interests are incompatible and that the Forever Knight never truly believed that he was stronger than Ben. It also happens in Season 4, with Kevin more open to it at this point.]]
* EvilCounterpart: Once again is this to Ben, this time with his own Omnitrix.
* EvilerThanThou: He and Charmcaster seem to have a mild rivalry concerning this, with both insisting that they are the more capable villain.
* GeniusBruiser: Apparently, he is a skilled mechanic, seeing as he was able to create the Antitrix.
* GreenEyedMonster: "Introducing Kevin 11" reveals that part of his hate for Ben comes from the fact that Ben has a supporting family, unlike him.
* HeelFaceRevolvingDoor: Following the originally ordered episodes of Season 3 where he was part of a BigBadEnsemble, the extra ordered episodes of Season 3 revolve around Kevin's constantly flip-flopping morality as he begins falling between being an AntiHero and being an AntiVillain. By Season 4, though, he's more of a solid AntiHero who [[TheRival simply insists on not getting along with Ben and trying to beat him at everything, including heroism.]] [[spoiler: This status persists even in Ben 10,000's future, where his insistence on competing with Ben causes him to get permanently stuck in an alien form of his own making but he is still willing to join fights for the greater good.]]
* HeroicSacrifice: [[spoiler:Allows himself to get lost through time in order to defeat the Forever Knight and allow Ben and Gwen to return to the present in "Roundabout: Part 2".]]
* HybridMonster: WordOfGod is that all of Kevin’s Antitrix aliens are mixes of two different species, presumably due to the Antitrix being a FlawedPrototype.
* {{Hypocrite}}: In "Which Watch", Kevin dismisses Charmcaster's petty grudge against Gwen as "stupid drama". All while continuing to take his own petty grudge against Ben completely seriously.
* ISurrenderSuckers: In "Buggy Out" he found himself being overwhelmed by Rath, so he pretended to surrender (as well as sweet-talking Ben), before sucker-punching him with Hot Shot's flame.
* {{Jerkass}}: He loves to make people miserable ForTheEvulz. As the show goes on, he swings between JerkWithAHeartOfGold and JerkWithAHeartOfJerk regularly.
* LackOfEmpathy: While not the sociopath that his Original Series counterpart was, this Kevin still suffers from this. The show's staff have said that this is the main thing setting Kevin apart from Ben: Ben will feel regret when he's messed up and apologize for it, whereas Kevin is largely incapable of doing the same.
* MistakenIdentity: Because of his watch, expect someone to mistake him for Ben or a relative of his. Taken up to [[JustForPun eleven]] when he and Ben lose memories and swap phones, leading them to read each other's diaries and think they're each other.
* MythologyGag: At the end of "Which Watch", Ben says "Way to go, team!" to himself, Gwen and Kevin, who were a team in ''Alien Force'' and ''Ultimate Alien''. Cue Kevin angrily shoving Ben away, insisting they are ''not'' a team and that he'll be back to destroy him later. [[spoiler:Happens again in "Roundabout: Part 2", where despite working with them and making a HeroicSacrifice for them, he insists that he is still their enemy and will ultimately be the one to destroy them.]]
* NoGoodDeedGoesUnpunished: In TheMovie, he comes the closest to a full-on HeelFaceTurn as he has ever had. As a result, he gets put through the wringer over and over again, and having his fears of inadequacy especially when compared to Ben reinforced stronger than ever before.
* NominalHero: Many times in the additional episodes ordered for Season 3, he ends up playing the hero either against his will or because he has a selfish objective to be gained in doing so.
* TheOnlyOneAllowedToDefeatYou: He's furious when Charmcaster controls him to try to kill Ben in "Which Watch", because if it's under her control then it doesn't really count as ''him'' getting to do it. [[spoiler:He also protests her trying to kill Gwen in "Roundabout" by saying that if anyone gets to kill her, it'll be him, although in this is just a cover for his PrecociousCrush on her.]]
* ParentalNeglect: He is the victim of this, as shown in "You Remind Me of Someone".
* PetTheDog: He helps Ben and Gwen in "Franken-Fight", even parting ways with them on peaceful terms for once.
** He also ends up working together with Ben in "Four by Four", even [[TakingTheBullet taking a laser tag bullet for him]], although he insists it was for just his own benefit.
** At the end of "Introducing Kevin 11", he helps Ben save innocent people from a collapsing building since he doesn't want people not involved in he and Ben's feud to get hurt (hence why he knocks the building onto Ben once the people are safe).
* PrecociousCrush: As shown in "Franken-Fight", he has a one-sided crush on Gwen. As we see later on, [[SheIsNotMyGirlfriend he vehemently denies it]] in front of either of the Tennyson cousins.
* RedemptionEqualsDeath: [[spoiler:Well, in this case it equals getting lost in a time portal, and he stubbornly insists it isn't a redemption. And he was right, as he finds his way back to the present in Season 4 and goes right back to causing trouble, albeit with less intense of an attitude as he had before.]]
* RedemptionRejection: Like in the original show, he does this frequently, as his stubborn pride and hatred of Ben is just too strong. [[spoiler:He even makes a HeroicSacrifice while still insisting he's "the baddest around".]]
* RememberTheNewGuy: He is introduced as someone Ben knows from school, but neither Gwen nor the audience are familiar with.
* TheRival: To Ben. He is even described as such in official material.
* RunningGag: Some season 3 episodes has some of the villains describe him as "emo Ben" due to having a watch with aliens like Ben but being overall DarkerAndEdgier, much to Kevin's chagrin.
* ShoutOut: Now that he has been fleshed out more as a rival to Ben rather than a legitimate villain, the dynamic between the two is quite reminiscent of Bugs Bunny and Daffy Duck.
* SheIsNotMyGirlfriend: If anyone dares to suggest that he has a crush on Gwen, which he does, he will swear up and down that he doesn't.
* SourOutsideSadInside: He may be a {{Jerkass}} bully, but deep down he's also a lonely kid.
* SurprisinglyRealisticOutcome: He may be Kevin, but he's still a kid, and so acts accordingly:
** He's upset when he hears his favorite cartoon is getting canceled and overreacts.
** Attacks an amusement park for toddlers solely because nobody ever took him there before.
** Does pranks for attention (albeit often to EnfanteTerrible levels) and likes playing Laser Tag.
** Has a PrecociousCrush on Gwen, another clever kid from his age range.
** That aside, him inventing the Antitrix (a manmade knockoff of the Omnitrix using garage parts) means he can customize it to have stronger forms, change whenever he wants to and stay transformed longer. But, as even the actual Omnitrix isn't flawless, he's prone to a more sensitive device, instable forms occasionally and inconsistent transformation time, such as when Ben lasted longer than he did when he transformed ''before'' Kevin. Because of that, his watch needs constant tuneups to stay functional.
* TroublingUnchildlikeBehavior: While not AxCrazy in general like in the original show, this version of Kevin has still made it clear that he'd have no qualms killing his rival Ben. He also claims he'd be fine killing Gwen, but in that case [[SheIsNotMyGirlfriend he's obviously in denial]].
* {{Unishment}}: [[spoiler: In ''Ben 10,010'', continuing to tamper with alien DNA in order to one-up Ben caused him to become trapped in the form of Humangoraptor, his answer to Ben's Humungosaur form, for several years, with no clear endpoint in sight. But given that this mean's he's now a giant, super-strong humanoid dinosaur, Kevin isn't exactly bothered by his condition.]]
* UngratefulBastard: A recurring trend with him is that any time Ben helps him or saves his life, it only makes him hate Ben ''more'' because he can't stand seeming weaker than him. The most blatant example is in "Buggy Out", where Ben saves Kevin from the angry Forever Knight, only for Kevin to willingly go back to the Knight at the end of the episode and offer up a way to use Ben's beloved family members against him.
* UnManlySecret: “Xingo-Nation” reveals that he’s a fan of [[ShowWithinAShow Lucky Girl]], though he doesn’t like people to know that.
* UnskilledButStrong: His modifications to his alien forms makes them more powerful, but Kevin still needs more practice. Likewise with his aliens; they do have additional features and strengths the originals don't but they also come with a drawback of not being that alien. Dark Matter for instance is much stronger than Grey Matter, but it's not quite as smart, and its larger size makes it easier to hit compared to Grey Matter.
* UnwittingPawn: [[spoiler: To Vilgax. The dream showing him how to build the Antitrix was sent to him by Vilgax, and Vilgax always intended to take it from him once he escaped the Null Void.]]
* VillainsOutShopping: In "Four By Four" he simply wants to enjoy a good game of Lazer Tag. It takes him a while to convince Ben he is not stalking and planning to attack him for once. This kind of incident happens more often with him in the additionally ordered episodes of Season 3, and a few in Season 4.
* WildCard: He can cause trouble, help to fix trouble, or both in any given order. Ben even lampshades in "Bottomless Ben" it by saying he will never be able to understand Kevin given how much his behavior keeps changing.
* WouldHitAGirl: As we see with his fight with Gwen in "Roundabout", he doesn't discriminate by gender when it comes to how ruthless he can be in dealing with his opponents. He also attempts to fight Charmcaster alongside Ben in "What Rhymes with Omnitrix?", but it [[CurbStompBattle doesn't go well for them]].
* YouAreBetterThanYouThinkYouAre: Gwen and Grandpa Max tell him this in TheMovie to convince him to help them.
[[/folder]]
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