Kevin 11

Kevin is one of the main characters in Season 3.

Kevin is a thin and scrawny boy with shoulder-length black hair, pale skin, and dark brown eyes.

Kevin wears a brown Omnitrix-type device called the AntiTrix on his left wrist.

Powers and Abilities
Kevin seems to be remarkably smart since he was able to build the AntiTrix with home materials.[2] He also added minor modifications that make his alien forms stronger and nastier than Ben's.

Equipment
'''Kevin is equipped with a powerful device called the AntiTrix, a makeshift version of the Omnitrix, which can transform him into mutated versions of Ben's aliens. But it does contain alien DNA that Ben hasn't unlocked yet.'''

Weaknesses
'''Since he had recently created the AntiTrix he has less experience than Ben, it makes it difficult for him to fully control his transformations. Furthermore, the alterations he made to the AntiTrix makes his alien transformations unstable and unbalanced.'''

Season 3

 * This One Goes to 11  (first appearance) 
 * King of the Castle
 * Franken-Fight
 * Which Watch
 * Buggy Out
 * Introducing Kevin 11
 * Four by Four
 * The Bentathlon
 * Roundabout