ciel_phantomhive
The protagonist of Kuroshitsuji.
The young heir and the son of the late Phantomhive household. He makes a contract with a demon in exchange for his life and escape from a cult sacrifice, and henceforth becomes a pragmatic and cool operator.
His name isn't actually Ciel. That was his older twin brother's name, and this Ciel usurped his identity after the former was sacrificed.