Trivia of Kevin | Ben 10

• According to the Pop-up version of the original Ben 10 series episode, "Perfect Day", it is revealed that Gwen Tennyson had feelings of sympathy for Kevin. This then grows into love in Ben 10: Alien Force. 
• In the Ben 10: Alien Force season 2 finale War of the Worlds, Part 1, it is revealed that Kevin's middle name is Ethan, making his full name Kevin E. Levin, officially connecting the pun to his old nickname "Kevin Eleven". Ben finds this extremely hilarious, saying that he has lost "all remaining pretense of 'cool".
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• He may be part alien because he said that his dad was a plumber. Even though his parents supposedly abandoned him (this may be a lie Kevin invented to impress Ben, because he doesn't answer to anybody), Kevin still has a mom who has most likely remarried, because on the end of Darkstar Rising, Kevin tells Ben and Gwen that he will tell his mom about his new plumbers badge.
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• Gwen hardly said two words to Kevin in Ben 10, but they interact in almost every Alien Force episode. Throughout the Alien Force series, Kevin has developed romantic feelings for Gwen, which has more than once been evidenced, although he is very reluctant to openly admit them which could be due to the fact that he is very self-conscious and concerned that it will never work out between them for obvious (if not too obvious) reasons, his checkered past, his lifestyle, as well as just being the pretty much opposite of her. However, in "War of the Worlds", Kevin demonstrates just how much he really cares about Gwen after she transformed into her Anodite form, by reaching out to her by saying that he doesn't want her to forget him or Ben and that he doesn't want to lose her, they embrace each other afterwards. At the end of the show Kevin also takes Gwen to the auto show.
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• Although seldom emphasized in the series, Kevin has a slight similarity to Max Tennyson, having first been pointed out by Verdona in the episode "What Are Little Girls Made Of?", this is supported by their similar personality traits, stubborn, adventurous and straightforward. Kevin has also worn Max's old tuxedo in "Save the Last Dance", possesses extensive knowledge about aliens rivaling that of the latter, as well as having a potential romance with Gwen, who is also of the Anodite heritage, reflecting Max and Verdona's past relationship.
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• Kevin's mutated form in the season 3 debut bears a striking resemblance to DC Comics Metamorpho and even possesses similar powers.
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• Kevin has been unable to transform back to his human form twice now. Both times were from tampering with the Omnitrix.