TV-Series
Description
Dr. Oldham is the leading physician and scholar of the Gargantia fleet, a floating community that travels across a world covered almost entirely by water. He is widely considered the most knowledgeable person aboard the fleet, a reputation that leads the young courier Amy to bring Ledo to him when the soldier first arrives and needs to understand where he is. Oldham works out of a modest library perched atop one of the fleet's spires, where he tends to a personal collection of books and records left over from the old civilization. His work combines two roles: he is the fleet's top doctor, responsible for the health of its people, and he is also a keeper of knowledge, preserving and studying whatever fragments of the past remain.

In personality, Oldham is gentle, patient, and approachable, and he is described as someone who is liked by nearly everyone on the fleet. He has a quiet, amused sense of humor, and he reacts with genuine laughter when Ledo expresses confusion or disdain for the social organization of the fleet, finding the soldier's strict military worldview absurd by the standards of everyday life. He is not a figure of great privilege or wealth within the fleet's social structure, but he holds a respected place as a healer, historian, and advisor, someone whose counsel is trusted by both ordinary residents and those in leadership positions.

Oldham is motivated by a deep curiosity about humanity's lost science and by a desire to understand and preserve the knowledge of the ancient world. He is especially interested in space travel and in the advanced technology that Ledo and his machine represent, and he eagerly questions the young soldier about the world beyond Earth. At the same time, he is honest about the limits of what the fleet can offer, explaining that most of the old technology has been lost and that the people of Gargantia do not possess the means to help Ledo return to space. His care for the community is equally strong, and he devotes himself to looking after the sick and vulnerable among the fleet.

Within the story, Oldham serves as an early guide and source of information for Ledo, introducing the visitor to the social structure of the fleet and explaining how the many interconnected ships function as a single city at sea. His role grows as the story progresses, and he becomes a figure of real authority, rising to become the second-in-command of the fleet when Ridget assumes the position of Fleet Commander. He is also party to one of the fleet's deepest secrets, knowing of a hidden weapon aboard the Gargantia that he and a select group of people have vowed to keep concealed.

His key relationships center on Amy and her younger brother Bebel. Oldham acts as Bebel's physician, treating the boy's chronic illness, and over time he becomes the closest thing Amy and Bebel have to a parental figure. With Ledo, he develops a relationship of mutual exchange, acting as a teacher and cultural interpreter while also learning from the soldier's firsthand accounts of the stars and the war that shaped him. He works alongside the fleet's leadership, including Ridget, and is assisted in his duties by a young helper who supports his medical and archival work.

Oldham's development is one of quiet but steady growth, moving from a background figure in his library to a trusted member of the fleet's inner circle. His knowledge of the hidden weapon ties him to the community's past in ways that go beyond his modest position, and his continued dedication to preserving knowledge carries into the later episodes, where he is shown reviewing accumulated records in the fleet's libraries as the community faces new challenges.

As for abilities, Oldham possesses extensive medical knowledge and skill as the fleet's principal physician, and his expertise is central to the care of Bebel and other residents. He is also a historian and archivist with a broad understanding of the old civilization, its lost technology, and the social workings of the fleet. While he is not an engineer and cannot build or repair the advanced machines of the past, his knowledge of the old world's science is considerable, and his gentle, thoughtful manner makes him an effective communicator, counselor, and caretaker within the community.