Ken Washio, designated G-1 and known as Ken the Eagle, leads the Science Ninja Team as its tactical expert. Orphaned young after his father vanished and his mother succumbed to illness, he was raised by Dr. Nambu and underwent specialized Science Ninja training from age 13. His civilian cover involves work as an aircraft test pilot and air delivery courier, operating from his inherited airfield property. Ken’s Bird Style uniform, eagle-themed, originally featured a white base with blue gloves, boots, and a beaked helmet visor, complemented by a red-lined feathered cape and a "G"-themed belt. The 1994 OVA redesign shifted to a primarily blue bodysuit with white accents, removing the belt emblem for a chest symbol. His civilian appearance evolved: early iterations showed shoulder-length brown hair with a "1" shirt and bell-bottoms; the OVA shortened his hair and added a "1" necklace; *Infini-T Force* depicted him taller with grey hair and stubble. He pilots the G-1 jet, transforming from a civilian craft and integrating into combined mecha like the God Phoenix or Gatchaspartan. His signature weapon is the Birdrang, a rocket-propelled boomerang with extendable blades. Later series introduced the Shock Gun in *Gatchaman II* and the Gatchaman Fencer—a collapsible sword channeling 200,000 kW—in *Gatchaman Fighter*. He also employs Science Ninja Techniques like the disorienting Bird Flash and holographic Kage no Bunshin. Typically calm and strategic, Ken exhibits emotional volatility during crises, relying on team support. He avoids romantic entanglements despite mutual interest from teammate Jun and struggles with financial responsibility, often deferring payments at her snack bar. His by-the-book leadership clashes with teammates like Joe the Condor over tactics or authority. A pivotal revelation occurs when Red Impulse, the team’s enigmatic ally, is unmasked as his father Kentaro—who faked his death to infiltrate Galactor. Kentaro’s subsequent sacrifice deeply affects Ken, intensifying his resolve against Galactor while increasing his emotional distance, particularly in *Gatchaman Fighter*. During *Gatchaman Fighter*, Ken suffers cellular degeneration from the Gatchaspartan’s "Hypershoot" maneuver. Visions of his father and Dr. Nambu reinforce his commitment to self-sacrifice for Earth’s safety. His bond with Joe deepens through shared trauma, including Joe’s temporary death and resurrection. Though Ken and Jun share ongoing romantic tension, their dynamic remains unresolved by the series’ conclusion. The unproduced Imagi film project envisioned a more armored Bird Style inspired by a 2000 design, while *Infini-T Force* portrayed Ken at 24 as the eldest Tatsunoko hero in a multiverse conflict. Across all iterations, his core arc revolves around reconciling his orphaned past, paternal legacy, and unwavering duty to protect Earth.