Also known as: セバスチャン・ミカエリス, 塞巴斯蒂安·米卡利斯, 塞巴斯蒂安米卡利斯
Titular character of Kuroshitsuji.
The current human guise of a demon contracted to Ciel Phantomhive, acting as his hyper-competent Butler. After Ciel finds and gets revenge on the people who murdered his parents, their contract is complete and Sebastian will eat his soul.