He is officially a handsome man. Even Pizza Nakajima, who attacked Sakamoto's shop, referred to Nagumo as 'handsome,' and during his JCC days, he received 152 chocolate gifts from female students on Valentine's Day, requiring a cart to carry them all. He has many tattoos all over his body. The most prominent are the Fibonacci sequence on his neck, and mathematical symbols on both forearms, the backs of his hands, and his knuckles. Besides these, he has many tattoos of foreign quotes, various geometric shapes, birds, and snakes. He is a 27-year-old handsome man with black hair and black eyes, known for being sly and playful. He uses a multi-tool and belongs to ORDER, the strongest force in the Assassin Association, making him extremely powerful. He stands 190cm tall and weighs 78kg. While he is usually sly and mischievous, he is the type to become terrifying when angry.