Her personality is initially cheery and talkative, though she is also shown to be easily frightened. She appears to secretly harbor a deep sense of depression, later revealed to be guilt for believing herself responsible for her father's death. She also has a pet drone, "Muffin", named after her childhood cat.

She is a hacker, but she prefers to be called as an Expert Intelligence Acquisitionist.

She is korean.

Marie is apparently 17 or 18 years old.

Her name: Marie Golden, Geum-Mari, Mari