Rei Sakuma is an extremely polite and courteous young man. He has a very unusual and somewhat eccentric way of speaking, he sounds old-fashioned, as if he was raised centuries ago, which makes him sound very funny, like an old man, to today's youth. He is a very wise, all-knowing, well-read guy. In addition, he simply loves to sleep and naps whenever possible. He has an absolutely vampire appearance: red eyes, curly black hair of medium length, fangs slightly longer than those of ordinary people