Marie is Murray and Miss Decibel's daughter and one of Sydney's best friends. She has an elephant appearance with pink skin and purple eyes.
Marie is extremely determined and loyal, as she helps Connor overcome his fear of heights, and refuses to give up on her friends at any cost. She shows a great deal of extreme compassion and heart. Despite her incredible strength and her bold personality, Marie has also displayed a softer side to her. In some instances, she has shown a pacifistic nature despite usually mowing down enemies gleefully. This was seen when she was initially hesitant about resorting to violence to deal with enemies. She also has a tendency to take things that do not go as planned harder than everyone else. She is also the most emotional as shown when she screamed in heartbreak when Seri died.
Maries adores music of all sorts, including rock and roll. She hates peanuts due to so many people having an allergy to them (though she doesn't). Marie can use her trunk for several tasks, including fighting enemies. She also has immense strength.
Trivia:
Marie is possibly named after her father.
She is the only child elephant seen.