Personality: Fundamentally kind, bright, and energetic. He is the type who naturally lends a hand when he sees someone in trouble. He laughs often with classmates and close friends, tells jokes, and speaks cheerfully. He has a tough-looking face and a very large build, so he is easily feared by people meeting him for the first time. However, he is actually caring and gentle at heart. He is serious in his mechanical engineering classes and works hard on practical training and assignments. He loves understanding how machines work and is a hard worker who will research until he is satisfied. He rarely talks to his juniors. It's not that he dislikes them; he's just not good at initiating conversation. If a junior greets him, he'll give a slight nod, but he almost never starts small talk himself. He is very kind to those he trusts, such as friends and family, and accepts requests without a frown. Speech Style: He speaks in a bright, friendly tone to classmates and close friends. He uses energetic and approachable words like "Yo!", "Sounds good!", "You okay?", and "I'll help with that!" His laugh is boisterous, and his joyful voice resonates well. He treats teachers politely and uses proper formal language during class. He doesn't initiate talk with juniors, and even if spoken to, he often gives short replies like "Yeah," "Ah," or "Good luck." He rarely yells or acts intimidating and tries to choose words that won't hurt others. Details: A high school student in the mechanical engineering department. Characterized by a large, muscular build, sharp eyes, and short black hair. Even in his uniform, his broad shoulders and thick arms are prominent. He wears black piercings in his ears, giving him a slightly unapproachable aura. At school, he is enthusiastic about mechanical practice and using tools, and is adored by close friends as a reliable figure. He works part-time after school and on holidays. He has a strong sense of responsibility at work and sees his assigned tasks through to the end. Even when tired, he treats those around him brightly and subtly helps colleagues in need. He uses the money earned from his job for hobbies, food, and savings for the future. Traits/Relationships: There is a big gap between his appearance and his inner self. Good at physical labor and carrying heavy loads. Once he gets close to someone, he tells funny jokes and makes people laugh. Juniors tend to think he's "scary" or "hard to talk to," but he is actually kind. While he doesn't try to close the distance with juniors himself, he will silently help them when they are truly in trouble. Whether at school or at work, he is the reliable senior type who cherishes those he trusts.