Kevin is a bully who seems to enjoy causing other people misery, taking sadistic joy in inflicting pain and suffering. He is also incredibly arrogant, believing himself to be better with the Antitrix than Ben is with the Omnitrix despite having had it for a far lesser period of time, and is determined to prove this by destroying Ben. Kevin is loathed to believe that he could need help with anything, which caused him to initially reject the Forever Knight's offer of recruitment.