Kevin Levin

Kevin Ethan Levin (otherwise known as Kevin 11) is a prominent character in the Ben 10 franchise.

Appearance
In the original series, 11-year-old Kevin was a thin and scrawny boy with shoulder-length black hair, pale skin and dark brown eyes with black-discolored marks around them. He wore a torn black T-shirt, black studded arm bands, brown cargo pants, black knee-length shoes, and a padlock necklace.

In an Ultimate Alien flashback, 11-year-old looked exactly the same as in the original series except his cargo pants have been replaced with jeans.

In Omniverse flashbacks, 12-year-old Kevin looked the same as before except for his pants were recolored grey and his padlock necklace is marked with an "11".

In the first two seasons of Alien Force, 16/17-year-old Kevin grew into a tall and muscular young man. His eyes lacked the black marks (as his body fully recovered from and stopped absorbing energy). His normal attire was a tight black T-shirt over a grey long sleeve shirt, blue pants, and black combat shoes. His hair, although still long, was styled into a choppy mullet. He retained this appearance throughout Ultimate Alien.

In season three of Alien Force, he was seen wearing a short sleeved light blue jacket over a white muscular shirt, blue pants, and his black combat shoes. After he went through a second mutation, an unbalanced mixture of various matters, the transformation completely destroyed his clothes, except his briefs. As a result, Kevin had to wear an ID Mask in order to appear human. In his second mutation, he looked like a mixture of solid materials such as stone, wood, Taydenite, and metal.

In Omniverse, 18-year-old Kevin wore the same black shirt but the sleeves and collar were roughly cut, the sleeves on his long sleeved grey shirt were slightly torn and he wore blue wholesters. His hair was longer and straighter. His pants had a small tear below the left knee. He also wore a padlock necklace similar to the one he wore when he was 11, but marked with an "11". He also sported black discolored marks around his eyes, making him appear tired; these marks bore similarity to when he was 11 and still absorbing energy.

Beginning in "Many Happy Returns", Kevin grew a few chin whiskers and his grey shirt gained stripes. In "Weapon XI: Part 2", Kevin gained the same cross-shaped scar to his chin that Kevin of Ben 10,000's timeline has.

In the 2016 reboot series, Kevin looks basically the same as in the original series except he does not have marks around his eyes, does not have arm bands, and wears blue jeans, black shoes that are red at the bottom, and a brown Omnitrix-type device called the Antitrix on his left wrist.

Personality
When Kevin first appeared in the original series, he quickly became one of Ben Tennyson's most notable enemies. However, he reformed in Alien Force, and became one of the main heroes. In this continuity, he is an Osmosian capable of absorbing energy, matter, and DNA.

In the reboot, Kevin is one of the main antagonists in season 3. In this continuity, he is an ordinary human equipped with a replica Omnitrix called the Antitrix that he generally uses to fight Ben out of jealousy.

Mutations
Kevin as undergone multiple mutations, most of which involved using his powers on the Omnitrix.

Kevin 11
Kevin's first major mutations occurs in the original series episode "Framed" when his powers get out of control. This form, dubbed "Kevin 11", mostly resembled a reddish-pink version of a Tetramand but with an upper left arm resembling a Pyronite's, an upper right arm resembling a Petrosapien's, and lower arms resembling a Vulpimancer's.

Kevin 11 had Lepidopterran wings, a Kineceleran tail, an Ectonurite eye track on his chest, and an upper back resembling a Galvanic Mechamorph. His head consisted of Kevin's hair and ears, two Tetramand-like left eyes, a Galvan-like right eye, and the lure, teeth, and gills of a Piscciss Volann. He wore cargo pants in the original series, but switched into jeans prior to an Ultimate Alien flashback, according to Dwayne McDuffie.

In a flashback featured in the Ultimate Alien episode "...Nor Iron Bars a Cage", Kevin was stuck in this form until a Null Void prisoner named Kwarrel taught him hot to control his anger and master his powers, resulting in Kevin reverting into human form.

Mutant Kevin (young)
Kevin's second major mutation occurs during the flashback portion of the Omniverse episode "Weapon XI: Part 2". During a fight with Eye Guy, Kevin used his powers on the Omnitrix.

12-year-old Mutant Kevin's appearance was similar to, yet different, from Kevin 11. His face retained Kevin's structure and hair but had green skin colored like a Florauna, a red Loboan-like right eye, a red Opticoid-like left eye, a Perk Gourmand-like mouth, and a To'kustar head fin and chin eyes.

His body most resembled an Arburian Pelarota's but with a Polar Manzardill's back and fins, a Splixson's lower chest and red sensory nodes, Thep Khufan bandages, and Transylian shoulders. His arms had lower parts resembling an Arburian Pelarota's and upper parts resembling a Transylian's with red Opticoid eyes, Florauna-like spikes, and fingers resembling Florauna tentacles. He also had Splixon legs, Florauna eggplant bombs, and a Perk Gourmand tail in a length similar to Wildvine's tentacles. He wore Kevin's pants and a Thep Khufan crown.

12-year-old Mutant Kevin was reverted after being knocked out by Argit before being taken back to the Null Void by the Amalgam Kids.

Mixed Material Kevin
Kevin's third major mutation occurs in the Alien Force episode, "Vengeance of Vilgax: Part 1". Ben's attempt to hack the Omnitrix goes wrong, and the Omnitrix overloaded. Kevin runs over to help Ben and tries to override the system, but he does not get there in time and gets caught in the feedback released from the Omnitrix. The blast alters his Osmosian DNA with those of various matter aliens in the Codon Stream.

Unlike his other mutations, Kevin retained his original frame yet his structure was made out of common elements. The right half of his face, the left half of his chest, the upper right half of his chest, part of his back, and his left arm were made of concrete. The lower right half of his chest, part of his back, his stomach, and his right arm were made of metal. The left half of his face was made of Taydenite, and his legs were made of wood. He wore Kevin's black briefs.

Kevin turned back to normal in "The Final Battle: Part 2" when the Omnitrix is destroyed. Max Tennyson pointed out that the Omnitrix's energy that had kept him in that form, meaning that his DNA would not have restored itself so long as the Omnitrix was functioning.

Ultimate Kevin
Kevin's fourth major mutation occurs in the Ultimate Alien episode "The Forge of Creation". In order to stop Ultimate Aggregor from absorbing the powers of a newborn Celestialsapien, Kevin had no choice but to absorb DNA from the Ultimatrix. This form, dubbed "Ultimate Kevin", easily drained Ultimate Aggregor's powers, reverting him back into his conventional Osmosian form. After being scolded by Ben's 10-year-old for his selfishness when he attempted to absorb the Celestialsapien infant, Ultimate Kevin left the Forge of Creation.

Ultimate Kevin's composition was more complex than his earlier mutations from his youth. His face mostly resembled an Aerophibian's, but with Kevin's hair, a patch around the right eye resembling an Evolved Vaxasaurian, and an Evolved Arachnichimp-like jaw whose interior resembled that of a Sonorosian. His torso resembled a Vaxasaurian's, but with the backside colored like an Aerophibian and a set of Necrofriggian wings.

His right arm mostly resembled a Petrosapien's but with two Crystalsapien crystal spikes on his shoulder and a Biosovortian-like claw. His left arm mostly resembled a Methanosian's, but with a Biovosortian spike on his shoulder and an Appoplexian's wrist claw. He had Aerophibian-like right foot and an Appoplexian-like left foot.

Ultimate Kevin also had a Vaxasaurian tail, two Cerebrocrustacean legs in place of a secondary left arm, a secondary right arm resembling an Arachnichimp's, and Orishan water ports.

Ultimate Kevin was cured in "Absolute Power: Part 2" thanks to the efforts of Ben, Gwen, Cooper Daniels, and Darkstar. However, Darkstar betrayed Team Tennyson and became Ultimate Darkstar by absorbing Ultimate Kevin's collective powers from the Dominus Librium. Fortunately, Ben anticipated this from the beginning and presses a button that stripped Morningstar of his new powers.

Mutant Kevin (teenage)
Kevin's fifth major mutation occurs during the present-day portion of the Omniverse episode "Weapon XI: Part 2". During a fight with Gutrot, Kevin uses his powers on the Omnitrix.

18-year-old Mutant Kevin's face resembles that of a Gimlinopithecus, but with red eyes, Kevin's hair, a Vladat-like mouth, a crest belonging to both a Gimlinopithecus and an Insectoid, and Conductoid antennae.

He has an upper right arm resembling a Segmentasapien's, an upper left arm resembling a Galilean's, a lower right arm resembling a Pturbosaurian's, and a lower left arm resembling an Atrocian's but with sharper claws. His torso mostly resembles a Gimlinopithecus's, with pieces of both Segmentasapien and Galilean near the shoulders.

He has a uneven set of wings, with the left wing resembling a Nemuina's and the right wing resembling a Turbosaurian's, on his back, and Orthopterran legs. He wears pants resembling Kevin's Rooter uniform.

Compared to every other mutation, Kevin has better control over this form, as he intentionally betrayed Servantis, freed the Amalgam Kids from his mind control, and willingly reverted back to his conventional form.

Monster Kevin
In the reboot episode "Which Watch", Charmcaster uses a page from her spell book to turn Kevin into an amalgam of all 11 of his Antitrix aliens, credited as "Monster Kevin". Since Duncan Rouleau has confirmed that each of Kevin's aliens is mutated fusions of two species, Monster Kevin is comprised of a total of 23 different species including human, Tetramand, Pyronite, Kineceleran, Subsapien, Arburian Pelarota, Galvanic Mechamorph, Galvan, Cascan, Florauna, and Lepidopterran.

His head resembled Kevin's but had eyes resembling Quad Smack's with Dark Matter's pupils, a mane resembling Bashmouth's and a goatee resembling Quad Smack's. His general skin color was purple like Quad Smack, and his torso also resembled Quad Smack's but had a total of six arms.

His upper shoulders resembled Crystalfist's, with the upper left arm also resembling Crystalfist's while his upper right arm was a purple version of Hot Shot's. His middle left arm resembled Thornblade's while his middle right arm was a purple version of Bootleg's. His lower left arm resembled Undertow's while his lower right arm resembled Dark Matter. He also had Wreckingbolt's back, purple versions of Skunkmoth's wings, and had giant version of Rush's tail in place of legs.

Kevin was returned to normal after Humungousaur and Gwen tricked him into using his Pyronite fire breath on Charmcaster's spell book, destroying it beyond usage.

Secondary Mutations
In "Kevin 11", Kevin absorbed some of Heatblast's DNA and became half-Pyronite. While his left arm and lower body remained unaltered, a diagonal border was at the chest where the Pyronite DNA took effect. His upper right chest, head, right arm and shoulder resembled that of an ordinary Pyronite. This mutation was only temporary.

Later in the same episode, Kevin absorbed some of Four Arms' DNA and became half-Tetramand. While his hair and lower body's clothing remain unaltered, his skin turned red and his arms enlarged and gained black fingernails on each hand. Four holes were on the sides of his shirt, allowing for four thin human-proportioned arms to extend through. He also gained Tetramand eyes and crooked teeth. This mutation was also temporary.