Frederick O'Hara serves as the Prime Minister of Mars in the anime Armitage: Dual-Matrix, holding significant political authority over the Martian colony. He is depicted as a senior male with short, white hair and black eyes. O'Hara is a strategic and pragmatic political operator who prioritizes Martian interests in the complex relationship between humans and androids. His primary motivation revolves around advancing and securing rights for robotic beings, demonstrating a deep personal investment in the passage of robot rights legislation.

In the story, O'Hara directly engages with the protagonist, Ross Sylibus, who is operating under the alias Kevin Oldman. Following Ross's intervention in a terrorist attack on a Martian terraforming project, O'Hara capitalizes on the resulting media attention to further his own political agenda. He offers Ross amnesty from prior criminal charges in exchange for his cooperation, appointing him as a Martian delegate to a decisive Earth summit where a controversial robot rights bill will be voted on. This appointment is a calculated move to secure Ross's endorsement of the bill, showcasing O'Hara's ability to use events and individuals to achieve his policy goals. Beyond this key political relationship with Ross, O'Hara is a figure of high-level Martian governance, though his interactions are primarily defined by his strategic maneuvering within the colony's leadership. While not possessing physical combat abilities, his notable skills lie in political manipulation, strategic negotiation, and wielding the influence of his high office.