The fourth member of the Team Isberto squad. She is "the tough one". Her signature color is light green, and she has short black hair in a flip. She was named because "Buttercup" begins with the letter "B" like her sisters, much to her chagrin. She is a tomboy and has a very short temper. Sometimes her aggression gets the better of her, making her reckless and stubborn. She possesses a mean and somewhat vindictive streak not shared by her sisters. Buttercup actually loves her sisters and does all she can to protect them.