Marco Santos is a student pilot in the Aerial Division at Cadoques High, operating their two-seater aircraft with classmate Wolfgang Baumann as his navigator and gunner. Marco exhibits a youthful, immature demeanor and deeply admires Wolfgang, viewing him as an older brother figure. His character arc pivots on the events of episode 8 during a critical battle against the Sky Clan. Their aircraft's engines are crippled by enemy fire. Wolfgang is killed while covering the retreat of fellow classmates. Marco survives the attack, though injured. The loss profoundly impacts Marco, given his dependency on and respect for his navigator. Information regarding Marco Santos's background, further development, or other media appearances is unavailable.