Shiro

Shiro is a neutral Mushi that follows Wakaba and tries to help him. Since only Wakaba can read, he is the only one that understands Shiro.

Personality
Always happy to help. It evaluates each of the characters and defines them in one word, it calls Rin hot-tempered while making smilies at Rina.

Trivia

 * Shiro means "white" in Japanese.