Dr. Marilyn Willow is a brilliant but highly competitive scientist in Marine A-Go-Go. She works alongside the professor and becomes one of Marine’s main rivals during the story. Intelligent, confident, and ambitious, Marilyn relies on her scientific expertise to create advanced technology and carry out her plans.

Although her actions are often driven by jealousy and personal frustration, she is more than a simple villain. Her determination, technical abilities, and strong personality make her an important source of conflict throughout the series. With her distinctive blue hair and commanding presence, Dr. Marilyn is one of the most memorable characters in the OVA.