She has the best shooting skill in R.O.C. She is also called “Lil' Miss Headshot". She lives by the code: "One shot, one kill." She didn’t attend in search unit at first, but joined special R.O.C team after the order from her dad as well as boss, captain Hugh, to be a surveillance of Carl. She continuously reports any suspicious activity that could lead back to the mysterious disappearance of Professor Russell. Is he really guilty of causing the disappearance? Despite her father's mistrust, Marie decides to go with her gut and follow Carl through every mission. But while conducting operations with him, she is convinced that he isn’t, so she helps him.