カミオ

Known as "Nathan Cackstone," head boy of Stratford. A demon general, the 53rd pillar who commands 30 armies, a great president of Hell. He is a half-demon, born of a human woman. He is rumored to be the illegitimate son of Lucifer, and of possessing power surpassing the four kings. Beloved by Maria Mollins, his human form is that of a young man holding a sabre, but his true form is that of a thrush. He can tell his summoner what birds and animals are saying, as well as the meaning behind the sound that water makes. A candidate for substitute king nominated by Beelzebub.

(Source: Wikipedia)