Dr. Leonardo is a genius scientist and inventor in the anime series Himitsu Kessha Taka no Tsume (Eagle Talon Secret Society). He plays a pivotal role as the chief inventor for the villainous yet comical group, Eagle Talon. Despite his affiliation with an evil organization, Dr. Leonardo is more eccentric than malicious. His inventions, often bizarre and humorous, are designed to help the society in their quest for world domination, although they usually end in failure. His quirky personality adds a humorous element to the series, making him a fan favorite.