Maria Nagisa is an FBI agent who was trained by Diane Martin's father, Special Agent Bosner.

When Diane is wounded in action by the Dracula Monster, Maria steps in to take her place as Miss America beginning in Episode 24. She officially assumes the role permanently when Diane decides to return to the United States.

Maria continues the legacy of Miss America as a key member of Battle Fever, appearing through the series finale in Episode 52.