Koyuki Azumaya is a supporting character in the anime series 'Keroro Gunsou'. She is a skilled ninja of the Shurara Corps and is depicted as a calm and collected individual with a strong sense of duty. Despite her formidable combat abilities, Koyuki has a gentle demeanor and a deep loyalty towards her friends, particularly Natsumi Hinata, whom she greatly admires. Her ninja skills often come in handy in various situations, making her an invaluable ally in the fight against Keroro and his platoon's antics. Koyuki's character adds depth to the series with her unique blend of strength and kindness.