TV-Series
Description
Onyankopon is a dark-skinned man with black hair in a short crew cut and a well-built physique. He typically wears Marleyan military uniforms or casual attire: a dark jacket over a dress shirt with long pants. Originally from a country occupied by Marley, he was forcibly conscripted into the Marleyan army before secretly joining Zeke Yeager's Anti-Marleyan Volunteers to oppose Marleyan oppression.

Arriving on Paradis Island in 851 with Marley's first survey fleet, he was captured when Eren Yeager seized his ship. Onyankopon and fellow volunteer Yelena disarmed their commanding officer to negotiate with Hange Zoë, forming an alliance with Paradis. He then shared Marleyan technology, aiding strategic developments like port construction to reconnect Paradis with the world. During the Scout Regiment's 854 raid on Liberio, he piloted their escape airship, navigating the internment zone route with skill and reassuring Hange. Back on Paradis, distrust of Zeke's faction led to the imprisonment of the Anti-Marleyan Volunteers by the military, despite their prior collaboration.

Onyankopon expressed dismay at this betrayal, highlighting the Volunteers' contributions. When Hange revealed Yelena's secret meeting with Eren before the Liberio attack, he provided insights into Yelena's harsh methods, including executing suspicious Marleyan soldiers. He later accompanied Hange to investigate assassinated military officials, receiving an alibi from her for bombings. After discovering Zeke's spinal fluid had been administered to Paradis officials via wine—Yelena's plan—Onyankopon denied involvement but was captured by Yeagerists. He later assisted Yelena during their takeover, including removing a murdered comrade's body.

During Marley's counterattack on Paradis, Onyankopon freed imprisoned soldiers to bolster defenses, though Connie Springer assaulted him over the wine plot. He pleaded ignorance of Zeke's euthanasia plan, arguing the Volunteers were essential for controlling Zeke until the Rumbling activated. Learning Eren intended global genocide via the Rumbling, he despaired over his homeland's impending destruction. Refusing Floch Forster's offer of honorary Eldian status, he condemned the Yeagerists for mirroring Marley's violence. Rescued from attempted public execution by Pieck's Cart Titan, he joined Hange, Levi, and Theo Magath's alliance to stop Eren. He piloted the Azumabito flying boat for this group, emphasizing the need for Azumabito mechanics' expertise for safe operation.

Onyankopon exhibits a friendly yet serious demeanor, building rapport with Scout Regiment members like Hange while expressing frustration over trivial military fixations. His religious worldview emphasizes ethnic diversity as intentional design: "Our creator thought that things would be more interesting if the world were occupied by many kinds of people." This belief fuels his opposition to both Marleyan supremacy and Eldian euthanasia, advocating for a future of diverse coexistence. His piloting expertise, likely from Marleyan service, proves critical in operations like airship evacuations and flying boat missions.