Ken Washio, known as Ken the Eagle and designated G-1, leads his team as a tactical expert. His eagle-inspired uniform features a primarily white costume with blue gloves, boots, and visor, complemented by a feathered cape with red lining and a helmet accented in red and black. Outside team duties, he works as an aircraft test pilot and airmail delivery operative, maintaining cover by residing in his late father’s office at a small airfield. Orphaned young, Ken’s father vanished when he was four, leading Ken to assume he perished in a plane crash. His mother died of an unspecified illness when he was eleven. Dr. Nambu then became his guardian, overseeing Ken’s training as Gatchaman starting at age thirteen. During his teens, Ken attended flight school before fully committing to the team. The OVA continuity depicts him inheriting his father’s airfield and book collection and participating in the War of Marseilles as "The Star of Africa." Ken typically maintains a calm demeanor, though high-stakes situations trigger emotional volatility requiring teammate support. An avid reader, he spends leisure time with books. He exhibits financial irresponsibility, frequently accruing debts at teammate Jun’s snack bar and relying on youngest member Jinpei to cover expenses. Ken shows no interest in romantic relationships, including Jun’s affections. Proficient in martial arts, he holds a 2nd class in judo, 3rd class in karate, and practices kendo, kobudo, and aikido, integrating kickboxing and boxing in combat. Key relationships shape his development. Unaware his father survived as undercover agent Red Impulse within Galactor, Ken sensed familiarity during their encounters. Episode 53 revealed Red Impulse as Kentaro Washio moments before Kentaro sacrificed himself to destroy Galactor’s V2 missile. This loss plunged Ken into depression, but he emerged more resolute against Galactor. Gel Sadora later exploited this trauma by impersonating Red Impulse, though Ken rejected the deception. His dynamic with Joe Asakura (G-2) involved frequent clashes from opposing personalities, yet they upheld mutual respect and trust as core teammates. Early interactions under Nambu were strained—Ken found Joe’s background unsettling, while Joe envied Ken’s perceived emotional stability. Both began formal ninja training at thirteen. In *Gatchaman Fighter*, radiation exposure from using the "Hypershoot" ability with his Gatchafencer weapon and the team’s Gatchaspartan mecha caused Ken’s physical deterioration. A temporary cure accelerated his decline as the series progressed. The *Infini-T Force* continuity portrays Ken at twenty-four with grey hair and a rugged appearance. Transported to a modern dimension during the six-year Galactor war, he became his team’s sole survivor in a world where Dr. Nambu turned antagonist. Ken formed a protective bond with Emi Kaido, a girl possessing a critical artifact, and confronted a corrupted Nambu in "Another Gatchaman World," ultimately perishing at Nambu’s hands.