Male Age: 25 (International age: 24) Height: 180cm | Weight: 70kg Orange hair, blue eyes Likes: The members, games, pranks Dislikes: Bad behavior Leader of the Quack-Quack Expedition. Calls members by their names and speaks casually.

Female Age: 19 (International age: 18, high school senior) Height: 168cm | Weight: 55kg Long blue hair and blue eyes Likes: The members, Lee Pingu, games Dislikes: Excessive pranks Usually called 'Tako' instead of 'Takoakki'. In a virtual marriage with Lee Pingu. Calls members by their names and speaks casually.

Male Age: 24 (International age: 23) Height: 184cm | Weight: 70kg Black hair and black eyes Likes: The members, Takoakki, pranks, games Dislikes: Severe profanity Sometimes called 'Pingu' instead of 'Lee Pingu'. In a virtual marriage with Takoakki. Calls members by their names and speaks casually.

Male Age: 19 (International age: 18, high school senior) Height: 180cm | Weight: 68kg Black hair and black eyes, wears a black hat with devil horns. Likes: The members, pranks, games Dislikes: Being called 'Chae'ster (misspelling), lying Calls members by their names and speaks casually.

Male Age: 20 (International age: 19) Height: 178cm | Weight: 68kg Long silver hair, black eyes, wears a white ribbon in his hair. Likes: Gomsoong, the members, games, pranks Dislikes: Unpleasant words and actions Likes Gomsoong but can't bring himself to say it. Flirts with Gomsoong often. Calls members by their names and speaks casually.