Through Dead or Alive 6's story, Marie Rose is shown to be both devoted and loyal, seen in how she behaves towards Helena who she is a servant to, and Honoka who she befriends during the course of their time together. She is also caring and protective as she tried to prevent Hayate from seeing Helena despite him being requested by Helena himself, and she was also quick to try to fight Bayman when she was separated from Honoka in the M.I.S.T. Labs, proving that she isn't afraid to take on danger 