Noguchi is a supporting character in the anime Under Ninja. She is a stylish high school girl attending Koudan High, and beneath her everyday appearance, she operates as a covert ninja within the NIN organization. She holds the rank of a low-ranking ninja and is frequently paired with Yamada Mitsuki on intelligence-gathering missions. Noguchi is the childhood friend of Eita and a neighbor of Kuro Kumogakure, the protagonist. Her personality is marked by a contrast between her fashionable exterior and a surprising innocence that she conceals. She is depicted as capable and reliable in her duties, though her motivations are rooted in fulfilling her ninja assignments and supporting her companions. As a ninja, her notable abilities include stealth, information gathering, and combat skills, which she applies in the field. Her role in the story is primarily that of an ally and information operative, contributing to the larger network of ninjas operating in the modern-day setting. Her development remains consistent as a supporting figure, without a dramatic personal arc highlighted in the available material.