Kevin 11
Real name: Kevin Ethan Levin
Full name: Kevin Ethan Levin
Aliases: Kevin 11,000, Curtis, Osmosian, Kev, Kevin Ethan, Levin, Ultimate Kevin, Doofus, An Empty Shell, Kevin E. Levin
Creator: DC Comics
Alignment: Good
First appearance: Ben 10 S01
Relatives: Mrs. Levin (mother), Devlin Levin (alternate future son), Ben Tennyson (Ben 10, best friend), Harvey Hackett (Stepfather), Gwen Tennyson(girlfriend) 
Gender: Male
Race: Human
Height: -
Weight: -
Hair color: Black
Superpowers: Accelerated Healing, Agility, Density Control, Energy Absorption, Flight, Matter Absorption, Molecular Manipulation, Power Absorption, Shapeshifting, Stamina, Super Speed, Super Strength
Stats: intelligence 65, strength 5, speed 10, durability 15, power 100, combat 40

History:
 Kevin 11 is a mutant who could absorb energy. He first met Ben 10 in a video games room until a group of bullies came and wanted to beat up Kevin. Ben scares away the bullies as XLR8. Kevin soon finds out about Ben and the Omnitrix and decides to make friends with Ben. Kevin in fact wanted to use Ben to commit crimes. Ben later discovers that Kevin is a sociopath and tries to stop Kevin as Fourarms. Kevin fights back and absorbs all the electricity in the area. Kevin jumps onto Fourarms and tries to suck all of the energy from the Omnitrix. Kevin then transforms into a half human and Heatblast creature. Ben still manages to defeat him.    Kevin soon gains absolute control over his new powers. He was able to transform into Stinkfly, Upgrade, Grey Matter, Fourarms, Ripjaws, Wildmutt, Heatblast, Ghostfreak, XLR8 and Diamondhead. However there’s a down side, he cannot stay his human form for a long period of time. Kevin blamed Ben for turning him into an abomination and sought revenge. He tracks down Ben and defeats Ben with ease in the beginning. Later Lt. Steel had been ordered to stop the aliens at any cost. At first, Lt. Steel suspects Ben is behind all of the crimes, but he soon discovers that Kevin is behind all of the crimes. Ben fights Kevin on a bridge, Ben uses Fourarms to stop Kevin and successfully defeats Kevin. Kevin wanted Ben to keep on fighting him but Ben refused. Ben told Kevin that he wasn’t worth his time, and an enraged Kevin transforms himself into all of the ten of Ben’s aliens from the Omnitrix. However, Kevin still loses and Ben knocks him into the water. And Kevin is believed to be dead, because (as Gwen points out) No one could survive that.    Kevin resurfaces later on and fights Ben on a wind farm. Ben was not faring well in this fight. Kevin then claims that he is 10 times as more powerful as Ben. They were teleported on to a Megacruiser by Slix Vigma, a creature that collects aliens from across the Universe to battle in a arena fight. Kevin and Ben decide to ally themselves and fight against Vigma's men. They soon discover that Vigma is a robot and Ben turns into Upgrade and takes him over. Kevin kills Vigma and tries to kill Ben but is thwarted by an alien that Ben saved in the arena, and Kevin is once again thwarted to defeat Ben..    Kevin gains control over the Megacrusier and forms an alliance with Vilgax, and both of them attack Ben. Ben had played with the Omnitrix and figured out the master code, he could now turn into any alien he wanted to, and he could stay in that alien form longer than 10 minutes. Vilgax figures that Kevin has the energy signature of the Omnitrix and he had the technology to remove the Omnitrix from Ben’s wrist. Before they can succeed Ben sets the Omnitrix back the way it was, now it Times out and he can only change for a little. Max uses the Null Void projector and sends Vilgax and Kevin into the Null Void. Kevin and Vilgax both fought each other for the Omnitrix and ended up being trapped there.    Kevin's future son, Devlin, befriends Ben's son Ken. Devlin could transform into his fathers original alien form and could easily change back to human. Devlin liberates Kevin. Kevin attacks Ben and Ken but Devlin betrays Kevin and helps Ben and Ken. Kevin was defeated again and was sent back to the Null Void and Devlin was adopted by the Tennysons.     In Ben 10 alien force Kevin apparently has broken out of the Null void and invested himself in some shady dealings involving level 5 alien tech which could very well put the earth in danger. It is when Magister saved his life that Kevin decided to help the heroes, that and the now 15 year old Gwen Tennyson might have swayed him to the side of good.     The Older Kevin's powers have also advanced, he now can absorb from any material and use it as a body armor. He has to be around enough of the substance in order to absorb it, otherwise he is just going to have only a small portion of his body changed. Kevin also reveals that his father was a plumber as well and he himself has always wanted to be one. Kevin's powers might have come from his alien lineage, like many others. He has been a great ally of the Tennyson’s, helping them find DNAlien dealings. He still likes to pick on Ben and give him a hard time. Kevin and Gwen show signs of a relationship, as Gwen asked Kevin to a dance. Kevin was even asking Ben for dating advice. 

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