Numbuh One (Nigel Uno) - Leader and head of Sector V, a workaholic, bald English kid who does not put complete trust in anyone but his team mates. He is the only one in a relationship outside KND, with Lizzie Devine, and is the only "only child" on his team. His last name of Uno is Spanish for the number one. His father was the famous Numbuh Zero, but is now decomissioned