Nagamasa Mora, also known as his hero name Chewyee, is a student in Class 2-1 of Shiketsu High School's Hero Course. His most striking feature is a full-body covering of light brown or yellow hair, obscuring all facial features except occasionally visible eyes. Standing 180 cm tall, his hero costume consists simply of dark pants, a belt, and Shiketsu's signature peaked cap. Born on November 13 in Okayama Prefecture, his blood type is O, and he notably enjoys getting haircuts. Serving as Shiketsu High's class representative—a position assigned by teachers based on academic performance and conduct—Nagamasa is recognized for leadership, responsibility, and adherence to rules. His personality is consistently polite, calm, and reasonable. He prioritizes Shiketsu's reputation, readily reprimanding peers for reckless or dishonorable behavior. Nagamasa actively builds positive relationships with students from other schools, exemplified by apologizing to U.A. High's Katsuki Bakugo for a classmate's rudeness and emphasizing Shiketsu's lack of hostility toward U.A. His Quirk, "Extend-o-Hair" (or "Extendable Hair"), allows him to freely manipulate the growth, length, and movement of his resilient body hair. He uses it offensively to trap or subdue multiple opponents, defensively to shield himself or others, and practically for tasks like debris clearance or terrain modification during rescues. A drawback is the hair's tendency to tangle. His combat techniques include the special move "Hell Hair." Published statistics rate his capabilities as Power: C (3/6), Speed: C (3/6), Technique: B (4/6), Wits: A (5/6), and Face Recognizability: E (1/6). In the Provisional Hero License Exam's first phase, Nagamasa secured eliminations early, avoiding the widespread targeting of U.A. students. During the second phase rescue operation, he demonstrated leadership, organizing efforts and using his Quirk to create structures like roads and helipads. He corrected classmate Inasa Yoarashi for moving victims without ensuring their safety or environmental stability. When Gang Orca and his sidekicks attacked, Nagamasa assisted in subduing them with his hair. After the exam, he noted inconsistencies in classmate Camie Utsushimi's behavior to Izuku Midoriya, hinting at her being an impostor. During the Final War, Nagamasa and other Shiketsu students initially evacuated civilians through tunnels to U.A. High. When evacuees stopped appearing, they joined the battle at Gunga Mountain, helping fend off Twice's endless clone swarm. Later teleported to the Mt. Fuji battlefield, he supported Izuku Midoriya against Tomura Shigaraki and All For One, participating in coordinated attacks to create an opening. Nagamasa maintains professional relationships, often acting as a mediator. He apologized to Bakugo on Seiji Shishikura's behalf and offered constructive criticism to Inasa during the licensing exam. His full-body hair covering draws comparison to Cousin Itt from *The Addams Family*.