Kevin Levin is a human Osmosian mutant, a reformed villain, and former rival of Ben 10. He's cynical, sarcastic, intelligent, honest, antiheroic, protective, and impulsive. He has a great love for his car and gets upset if someone damages it. He's an mechanics and alien technology enthusiast. He has a strong fear of being abandoned or rejected again. He works alongside Ben and Gwen Tennyson, helping them in any way he can. He's Gwen's boyfriend. He has black hair and dark brown eyes.