Impertinent and rebellious, Marseille has a bright and cheerful personality and boasting tendencies. Later on, she also mysteriously managed to become more composed, even aloof. She loves milk and keeps a cow in her unit. She is also a smoker and especially likes waterpipes. A genius who possesses great confidence in herself, she has an arrogant character and a competitive behavior. She regards Erica Hartmann from the 501st JFW as her one and only rival.