TV-Series
Description
Nyanko, whose true name is Madara, is a powerful yokai and one of the main characters of Natsume's Book of Friends. He is a high-ranking flying white wolf yokai who ordinarily takes the form of a round, overweight maneki-neko, or lucky cat, which is why Natsume nicknames him Nyanko-sensei. He was sealed in a shrine for many years until Natsume accidentally freed him, and because he spent so long trapped in a material form, he continues to use the cat shape in daily life. In this form he is visible to ordinary humans, which allows him to live openly with Natsume and his guardians.

In terms of personality, Nyanko is prideful, arrogant, loud, and quick-tempered. He often speaks down to lesser yokai and complains constantly about Natsume's kindhearted and forgiving nature. He is also indulgent, frequently overeating snacks such as manju, shrimp, and squid, and drinking sake until he is drunk. Despite his small and comical appearance, he is an exceptionally powerful spirit, and when he reveals his true form, most other yokai are intimidated or flee outright. He often claims he is not a cat, yet he enjoys playing with cat toys, and he frequently bickers with Natsume in a way that leads to comedic physical confrontations.

His motivations begin as entirely self-interested. When he meets Natsume, he wants to claim the Book of Friends, the collection of names left by Natsume's grandmother Reiko. He makes a deal to serve as Natsume's bodyguard until Natsume dies, at which point he will inherit the book. Although he continues to grumble about wanting to eat Natsume or take the book, he never acts on those threats and instead protects Natsume from malicious spirits and dangerous exorcists. As the story progresses, it becomes clear that his attachment to Natsume is genuine, though he works hard to deny it.

His role in the story is that of Natsume's self-proclaimed bodyguard, protector, and occasional teacher. He accompanies Natsume on his mission to return the names in the Book of Friends to their original yokai owners, even though returning the names weakens the book he hopes to inherit. Beyond physical protection, Natsume relies on him for spiritual advice, knowledge of the yokai world, and help with spells on occasion.

In terms of relationships, his bond with Natsume is the emotional center of his character. Initially antagonistic and dismissive, he gradually develops a deep attachment to Natsume and quietly becomes the first true companion Natsume is able to welcome into his life. He also knew Reiko long ago, which gives him a personal connection to the book's history, and he holds a certain respect for her cunning nature. He interacts with other members of Natsume's circle as well, including Natsume's friends and allies, and shares a particular rivalry with the horse yokai Misuzu, who competes with him over who is the better protector of Natsume. He holds strong disdain for the exorcist Matoba, who hunts yokai ruthlessly and poses a threat to Natsume.

His development is gradual and understated. What begins as an alliance of convenience transforms into a genuine friendship, with Nyanko showing rare moments of vulnerability and care beneath his boastful exterior. He grows fond of Natsume despite his complaints, and his willingness to put himself in danger for Natsume's sake becomes one of his defining traits.

His notable abilities include shapeshifting, with his natural form being a massive white wolf-like yokai capable of flight, and his everyday form being a small lucky cat. He possesses great physical and spiritual strength, can conceal his presence when he chooses, and commands enough raw power that merely showing his true form is usually enough to resolve a confrontation. He also carries extensive knowledge of yokai, spirits, and spiritual matters, making him an invaluable guide for Natsume even if he rarely admits it.