Marie is the miniature servant of Mizuho. He is quasi-organic master control program for Mizuho's ship. Totally self-repairing and maintenance free. Hovers around in an inner tube and on occasion plays a miniature guitar. Due to Kei fearfully striking 'him' during an initial escape attempt when Mizuho revealed her true identity, Marie's programming became scrambled, endangering both Kei and Mizuho. Communicating partly through indistinct sounds and through gestures, Marie is essentially a portable link to the ship's operating system.

But 'he' is also capable of emotion, as witnessed by the romantic relationship formed between 'himself' and Miruru and his sorrow at their parting. Additionally, in the OVA they are implied to have sex, and both of them become embarrassed when they see others display affection. The implication provided in the series 'extras' is that Marie and Miruru are but extensions of the ships themselves, and thus are the ships. Marie also appears in Please Twins!, often eating a different brand from Pochy, called "Prech".

He also appears in his larger role, Marie's Love Theater, featuring the timid Marie himself tries to show his loving feelings with right words towards Miruru to fulfill.

Marie is even more open than his counterpart, Miruru. He shows mannerisms of a human, being childish and fun-loving, he is also shown playing with his ukelele and capable of eating, such as Prech.

He is very tiny has pale yellow skin and wears a yellow jumpsuit with a hoodie and a cone-shaped head and small round eyes. His mouth is sometimes visible and he has a zigzag tail with a red sphere on the tip. His arms are small and he is always seen with a red life preserver.