Shiro is a very cold, callous, dispassionate man. He will kill anyone that he considers "trash" without hesitation. He despises of talking with others but will try to understand the people around him without communicating. His current personality is a total opposite when he was younger. When he was still a kid, he was a kind and easy-going kid who used to joke around. He cares and shows a strong sense of loyalty to his friends and this is the only personality he keeps after the dramatic changes during his teenage years.