The folktale in feudal japan about a monstrous nekomata whose greed for blood was too much. His ignorance and lust for blood got him caught and killed, or so the tale told. He simply let the priest have his way with an illusion as the demon lives in the night, hunting and finding mice of men to play with before devouring their life.
In Black Butler, CC is a known nekomata or more specifically a vampiric cat demon. He often will do things for those who summon often at the request of their blood. The bigger their request, the more blood he takes from them with a few exceptions. Unlike most of his demonic brethren, CC does not care for souls to devour; even after drinking a person dry. He will let reapers collect the soul he "spared" in hopes of becoming captured, or at least hunted by someone of a higher class.
In Ouran CC would be a teenage Idol having to put his career on hold to finish his education as he flees from those who would know of his career, but not by hiding who he is on school grounds, by making a considerable donation to allow him to wear some of his "props" even while in class.