Rantaro is good-looking, and that his looks resemble those of a stereotypical "playboy." Rantaro seemed like a mysterious individual. Later it could be seen that he is a carefree and relaxed person. Despite his mysteriousness, he is described as one of the more ordinary students. He exudes a truly calm and restrained atmosphere, which makes him seem like a fairly reliable person. His speech is characterized by a very friendly and conversational character. Green hair and eyes. Smart. Kind.