Mary is a supporting character in the anime Dimension W who operates as a key figure in the underground network of Collectors, the bounty hunters tasked with confiscating illegal Coils. She is the head of a business known as the Recovery House, which outwardly appears to be a café but functions as a front for her true occupation as an information broker and a dealer in illicit Coil-related activities. Mary is a stout, round woman of average height with white hair that she keeps tied up in a large bun, blue eyes, and beige skin.

Her personality is marked by a pragmatic, business-first attitude. She speaks directly and does not waste time on sentimentality when handling her operations, yet beneath this tough exterior she possesses a maternal concern for those she works with, particularly Kyouma Mabuchi. She is one of the few individuals Kyouma trusts enough to take assignments from, and she regularly provides him with jobs that involve tracking down illegal Coils for bounties offered by New Tesla Energy. Mary is well-connected within the criminal and Collector communities and possesses considerable knowledge about the technical aspects of Coils and the underworld's movements.

Mary's primary motivation appears to be profit and maintaining her position as a reliable intermediary, though she also exhibits genuine loyalty to her trusted associates. She does not seek personal power or direct involvement in the larger conflicts surrounding Dimension W; instead, she supports the protagonists by supplying them with information, equipment, and rewards. She employs the technician Koorogi to assist with her operations, and together they form a small but essential support network for Kyouma.

Throughout the series, Mary remains a consistent, steady presence. She does not undergo major personal development or change in her role, but her reliability and knowledge make her an indispensable ally. Her key relationship is with Kyouma, whom she treats with a blend of professional respect and personal concern, occasionally chiding him for his recklessness. She also interacts with other Collectors and figures in the criminal world, but her bond with Kyouma is the most developed. Mary has no special combat abilities or supernatural powers; her strength lies in her connections, her understanding of the black market, and her ability to manage the logistics of bounty hunting. She is a classic behind-the-scenes supporter who helps the main characters move forward without taking center stage herself.