Mickey Dugan, originally named Jinpei in the source material, is the youngest Eagle Rider. Orphaned early, he resided in an institution until Jun (renamed Kelly Jennar) persuaded Dr. Thaddeus Keane (originally Dr. Nambu) to remove them both. Dr. Keane subsequently adopted and raised Mickey.

Despite his youth, Mickey proves an agile and capable fighter, demonstrating accuracy with his specialized weapons during missions. His combat style prioritizes quick movements and precision, tactically leveraging his small stature. He possesses a notable rapport with children and animals, traits that sometimes yield strategic advantages for the team.

Within the team, his long-standing relationship with Jun/Kelly establishes her as a de facto older sister. Mickey views Ken (renamed Hunter Harris) and Joe (renamed Joe Thax or Flash in early dubs) as older brothers, looking up to them while occasionally rebelling when feeling overlooked. His dynamic with Ryu (renamed Ollie Keeawani) is more casual and buddy-like, though Ollie disciplines Mickey when necessary. Mickey's Bird Style designation is the Merlin, distinct from his original Japanese codename.

Mickey has no known biological family; Dr. Keane and the Eagle Riders form his primary family structure. The series depicts no character arc beyond the televised episodes, with no substantial development or backstory expansions in spin-offs, films, or other media. The adaptation excises or alters original Japanese plot points involving his vulnerability or emotional struggles.

His personality blends playfulness with determination, though the English adaptation minimizes the deeper complexities present in the source material. Mickey's role remains consistent as the team's spirited youngest member, with no official lore extending beyond the televised episodes.