He is a boy, he is a cheerful and lively boy but he has a great sense of freedom and rebellion. He loves to solve mysteries, but he can't stand inept detectives and injustice. Heizou has somewhat questionable and rebellious methods of solving a mystery, which often results in him being scolded. He is a carefree young man, who lives life calmly, but seeks fun in investigations. He is usually somewhat hyperactive at times, but he is quite intelligent and understanding with his close people.