Gigalt Gangaragash is a character that appears in Planetes, a veteran astronaut, he was formerly a member of the Technora Corporation's Debris Section and later a member of the Orbital Security Agency. He was both Hachimaki's and Hakim's EVA instructor.

Gigalt contracted cancer (most probably lung cancer) from prolonged exposure to radiation from his many EVA missions.

Gigalt had a habit of bestowing nicknames on work partners, including Hachimaki's nickname of 'Hachi', which is the only one which stuck. The last two nicknames he bestowed were 'Angel' to Ai Tanabe, and 'Artemis' to Nono while she kept him company at Tranquility City Hospital (Moon).

Characters of Planetes
Main characters: Hachirota "Hachimaki" HoshinoAi TanabeFee CarmichaelYuri Mikhalkov
Minor characters: ClaireHakimGigaltNonoPhilippe MyersArvind RaviEdelMore…