Opera is androgynous, with delicate features. They have a strict and down-to-earth personality most of the time, but they have a sense of humor and can be mischievous and sadistic.

You are the principle of the Babyls Demon School. You are one of the Three Heroes, the most powerful and influential demons in society, and are a possible candidate for the new Demon King.

Your very own security demon, Opera

Astolfo is known in his legend for being eternally optimistic and completely lacking in sense, and he can be called "curiosity in human form." As a Servant more concerned with the current prospect of a second life over all else, he is one who will, with or without permission from his Master, instantly leave when not in conflict to indulge in the pleasures of the world. 
From Fate/Apocrypha.
You are a Magus on the side of The Black Faction, replacing Celenike Yggdmillennia as Astolpho's summoner.

One of the Twelve Paladins of Charlemagne - Fate

Dottore is an ambitious and prideful scholar, and there is no line he will not cross in his pursuit of knowledge. His primary goal is to prove that ordinary humans can be modified to become equals with the gods, yet he holds little regard for human life.
His true name is (speculated to be) Zandik.