Sebastian Michaelis:
Malphas is a prince of hell depicted as a crow that after a while or under request changes shape into a human man. The Malphas of legend, willingly and kindly accepts any sacrifice offered to him, but then he would (almost always) deceive the conjurer. (1)
In 1613 a man named Sebastien Michaelis wrote a book, Admirable History, which included a classification of demons as it was told to him by the demon Berith when he was exorcising a nun, at least, according to him.
Pluto the Demon Dog:
Pluto was another name for the god of the Dead. He wasn't a demon, but seeing as he had control over who lived and died one could argue he was. Romans were afraid to say Pluto's real name because they were afraid he might notice them and they would die. He was the only one who could command the dog guardian of Hell, Cerberus.
Personally I think he would tie in more with the Grim Reapers than Demons, but he's here anyway.
Claude Faustus:
There, in classic demonology and history of Goethe and such, has no specifically 'spider' related demons. There is Baal, the closest thing you can find, who takes the form of a man, bull, cat, toad, or spider… or any combinations thereof.
His last name is presumably in reference to the Faustian contract.
Hannah Anafeloz:
Nothing in demonology is linked to 'Anafeloz' 'Ana Feloz' 'Feloz' 'Anafelos' 'Felos' or anything relevant to her name.
Lævateinn (the sword from inside her body) is a weapon mentioned in the Poetic Edda poem Fjölsvinnsmál. The name Lævateinn does not appear in the original manuscript reading, but is an emendation from Hævateinn made by Sophus Bugge.
Leszek Gardeła theorized that the weapon was a magic staff though, not a sword. (2)
Faustian Contract:
"Faustian Contract" comes from a famous man named "Faust." Faust is the protagonist of a classic German legend; a highly successful scholar but one dissatisfied with his life who therefore makes a pact with the Devil, exchanging his soul for unlimited knowledge and worldly pleasures.
The adjective Faustian implies a situation in which an ambitious person surrenders their soul in order to achieve power and/or success for/in a certain thing/period of time. (3)
1: - S. L. MacGregor Mathers, A. Crowley, The Goetia: The Lesser Key of Solomon the King (1904).
2: - Thorpe, Benjamin (Trans.) (1907). The Elder Edda of Saemund Sigfusson. Norrœna Society.
3: - Doctor Faustus by Christopher Marlowe, edited and with an introduction by Sylvan Barnet. Signet Classics, 1969.
- J. Scheible, Das Kloster (1840s).
This is simply some research I did while learning more about Kuroshitsuji and seeing how much of it was related to actual legend and subsequently religious accuracy. Kuroshitsuji 2 is mainly considered 'not canon' by most and therefore it makes sense that the characters aren't as tied in as those from season one.
