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セバスチャン・ミカエリス [Sebasuchan Mikaerisu]
He is the butler of the Phantomhive household, and acts as Ciel Phantomhive`s bodyguard. He is highly skilled in anything you name, and handles every task given to him, no matter how impossible it may seem.
This demon has a soulbound contract to Ciel, which is the reason why Sebastian obeys everything Ceil tells him to do.
Sebastian can take form of a crow, or a cat. His true demonic form hads not been shown in the anime.
The name "Sebastian" has been given to him by Ciel.
After all, I am one hell of a butler.
わたしはあくまで執事ですから [Watashi wa akuma de shitsuji desu kara]