Luis Frois is a Portuguese missionary nun who appears as a supporting character in The Ambition of Oda Nobuna. She is introduced during Yoshiharu Sagara's journey to the port city of Sakai, where she and her bodyguard Bontenmaru are attacked by bandits and rescued by Yoshiharu and Inuchiyo. Her stated goal is to obtain permission to travel freely across Japan so that she can offer aid to the suffering. She is depicted as a calm, collected, and perceptive individual, demonstrating clear insight into the interpersonal dynamics around her. On one occasion, she helps Yoshiharu realize that Nobuna's teasing was actually an expression of jealousy, showing her ability to read emotions accurately. Her appearance is striking, with very long blonde hair and blue eyes, and she wears a traditional nun's habit. Her personality is gentle but shrewd; she rarely loses her composure and approaches situations with a level-headed demeanor that complements her missionary zeal. In terms of role, she serves as a minor ally to Yoshiharu and by extension to the Oda clan, contributing more through her understanding of human nature than through direct action. Her relationship with Yoshiharu is one of mutual assistance, and she interacts respectfully with Nobuna and the other characters. While her character does not undergo significant growth within the anime's limited runtime, her presence provides a calm, foreign perspective on the war-torn Sengoku setting. Her abilities are not combat-oriented; instead, she relies on her perceptiveness, diplomatic calm, and knowledge of the world beyond Japan. Ultimately, Luis Frois stands out as a composed and intelligent figure whose brief encounters leave a meaningful impression on the main cast.