Olinoga commands within Atland's cavalry forces, identifiable by his short blue hair and blue eyes. His duties include leading military operations to defend Atland's interests against the rival nation of Valghia. During Princess Liliha's absence, he actively searches for her near Atland's borders. This search leads him and his unit to discover deceased Valghian soldiers and signs of combat, prompting him to order a thorough sweep of the area.

When Princess Liliha and Kaina return to the Snow Sea from the Canopy and face attack by Valghian soldiers, Olinoga intervenes to aid them. He engages the Valghian officer Amerote in combat but finds himself outmatched. Following Princess Liliha's direct command, he retreats from the battle, ensuring Kaina's safety while reluctantly leaving the princess behind.

Later, in the broader conflict against Valghia, Olinoga devises a tactical plan involving a surprise assault launched from the open sea. This strategy requires his unit to conceal themselves offshore before executing a rear attack. While the plan faces skepticism from figures like Mulnota, it receives full endorsement and trust from Halesola.

His actions consistently demonstrate commitment to Atland's defense, strict adherence to the chain of command, and responsibility for his troops' safety during missions.