Geraldine is an instructor for the Gemini Laboratory martial arts program as well as being in charge of managing the petty officers. She is the adjutant of "Gemini Force". Her hair color is a pale blond and her eyes are blue with a light sepia tint. Her favorite food is miso cutlet and her favorite cocktail is a Pina Colada. Her special abilities are playing the bass guitar and mental arithmetic. Things that she doesn't like include ghost stories and listening to Ulrika's poetry.