Ryou Kutani is a significant character whose hidden childhood, concealed by his mother, masked his true status as the legitimate heir to the Inukai guardian lineage. This position was held by Shinji Inukai until Ryou's existence and rightful claim surfaced, leading to his eventual acceptance into the group of guardians protecting the Tamayori Princess.

Standing 180 cm tall, he possesses olive-colored shoulder-length hair and striking red eyes, his appearance setting him apart from ordinary humans. His personality leans strongly toward independence and straightforwardness. Ryou operates as a loner, frequently wandering to gather information, and exhibits a tendency toward candid speech, often perceived as arrogant or provocative. This complicates interactions, frequently leading to conflicts or resentment. Despite his solitary habits, he demonstrates a capacity for connection, showing loyalty to the guardians and Tamaki after joining them.

Ryou's abilities originate from his lineage, granting him wolf-like traits including enhanced senses, particularly an acute sense of smell. As his powers fully manifest, physical changes occur: wolf ears, a tail, and crimson facial markings emerge, accompanied by a shift in eye color to yellow. These attributes underscore his connection to okami (wolf) youkai ancestry.

His involvement spans key events across the series, with appearances in multiple episodes. Initially resistant to structured alliances, his role evolves as he integrates into the guardians, contributing to their efforts against threats like Logos. His development includes a gradual shift toward cooperation and loyalty, particularly toward Tamaki, whom he aids alongside the other guardians. His commitment to the group's mission and protective duties remains consistent.