Giraniku functions as a military commander in the Dazaan Army under Emperor Dazaan's command, spearheading assaults against Earth and its protagonists. He deploys mechanical beasts and metallic entities to execute destructive missions targeting infrastructure such as passenger planes and urban centers.

On the battlefield, he issues direct tactical commands during confrontations with the UFO Boy Scouts team. Documented engagements include his command of the demon beast Buragadon during a Dark Nebula invasion, his oversight of the metallic being Angora as it consumed passenger planes, and his direction of the mechanical beast Sasoringer against the protagonists. He also coordinates formations of iron troopers combined with flying saucer strongmen for destructive campaigns.

The character appears under multiple naming variations across releases: consistently as Giraniku in the original Japanese version, redesignated as Garano in the English re-edited movie *Shadow World*, and under alternative spellings like Gyranik in international dubs. These represent localized versions of the same character.

Throughout the series, its second season, and the English movie adaptation, Giraniku maintains a consistent antagonistic military function without documented narrative evolution, personal backstory, or character development beyond this operational role.