All the Adventurers have names related to weather, a precedent kept in the contemporary Pharaoh's Quest theme.
Johnny Thunder: The leading man in the LEGO Adventurers line. He is Australian and is a daring, compassionate archaeologist. He sports a khaki shirt with a red bandanna, has black legs, and a brown bush hat.
Dr. Charles Lightning:(later renamed Dr. Kilroy) One of Johnny Thunder's companions on his epic adventures. He is a professor and is like a father figure to Johnny. He sports a pith helmet, a white shirt with a red bow-tie, and green legs.
Gail Storm:(later renamed Pippin Reed) The female companion of Johnny Thunder who is a budding journalist for the 'WORLD' Magazine, recording all of his adventures. She sports a green, brown, or tan jacket, red legs or tan legs, and either a pith helmet or pilot helmet.
Harry Cane:(also known as Hurrykain) One of Johnny Thunder's best friends, who is an experienced pilot. He wears a pilot helmet with a leather jacket and black legs.
Baron Von Barron: The main villain in the Adventurers line, he seeks to take things he considers valuable, including dinosaurs. He has a scarred face and sports a monocle, khaki shirt with holster, grey legs, epaulettes, and either a pith helmet, top hat, or pilot helmet. His left hand is a hook.
Slyboots: Sidekick or partner to Baron von Barron. One of the main villains, he dresses entirely in black and is a representation of the archetypal "villain". Also known as Sam Sinister.