Merribit Stapleton is a secondary character in the anime Mobile Suit Gundam: Iron-Blooded Orphans. She originally worked in the banking division of Teiwaz, a powerful Jupiter-based conglomerate with ties to organized crime. On the orders of Teiwaz's leader, McMurdo, she was dispatched to Mars to handle the accounting and financial management for the young mercenary group Tekkadan. In that capacity, she becomes the organization's accountant and liaison at their Mars headquarters, responsible for tracking income, expenses, and providing administrative oversight.

Merribit is a diligent, hardworking individual who takes her duties seriously. She possesses a strong sense of empathy and shows genuine concern for the well-being of those she works alongside, particularly the adolescent members of Tekkadan. Though she is a civilian in a world dominated by violence and military conflict, she supports the boys even while feeling pained that they know no other way to live than by risking their lives. This inner conflict underscores her compassionate nature—she wants to help them build a better future, even as she struggles with the harsh reality of their situation.

Her motivations are rooted in a desire to fulfill her responsibilities and provide the young mercenaries with stable guidance and financial order. She serves as a voice of reason within Tekkadan, often offering advice and emotional support to Orga Itsuka and other core members. Her role is primarily administrative, but her presence brings a degree of civilian normalcy to the otherwise militaristic environment. She does not pilot a mobile suit or engage in combat; her notable abilities lie in accounting, organization, and interpersonal sensitivity.

Over the course of the series, Merribit develops a deep bond with the Tekkadan members, becoming a trusted figure who cares for them almost like a mother. She witnesses the group's rise and fall, and her own character arc shows her growing increasingly conflicted as she sees the toll their violent lifestyle takes on them. Despite the tragedies and losses that surround her, she remains committed to supporting the survivors as best she can. Her key relationships include those with McMurdo, who initially assigned her, and with Orga, Mikazuki, and the rest of the Tekkadan crew, whom she respects and looks after.

In summary, Merribit Stapleton is a capable, compassionate administrator who bridges the gap between the financial interests of Teiwaz and the day-to-day struggles of Tekkadan. Her strength lies not in combat but in her reliability, empathy, and quiet determination to help the young mercenaries navigate a world that offers them few good choices.