- Full Name: Eiko Villan (エーコー・ウィラン Ēkō Wiran)
- Species: Human
- Born: June 12, 1869
- Origin: Le Havre, France
Eiko is Nautilus' sonar operator and founder of Ikolina's fan club. In episode 16, Eiko reveals that he is the sole survivor of the shipwreck of Elise Le Havre, Jean's father's ship.