His Fingers turning into knifes in his Second Ascension is most likely a reference to when Robert Englund, who played Freddy Kruger in the Nightmare on Elm Street Movies, was portrayed as him in the 1989 Phantom Of The Opera Movie directed by Dwight H.He was the only Servant who has two different idle animations of battle sprites in Bronze rarity at FGO's initial launch.He has the highest HP value out of all Bronze rarity Assassins.

Because of this, the Phantom has become a popular costume choice for masquerades, Halloween and other dress up occasions. Since then, it has been made into several movies and a widely popular musical that has inspired a cult following. Berserker of Shinjuku is his alias in the Shinjuku Main Quest. 'The Phantom of the Opera' was first published as a serialized novel in 1910 and met with little success.If you don't level him enough, he might turn you, his Master, into a pile of bones. He's always singing, and he's difficult to level. Therefore, he will probably care for the Master more than anything. His wish for the Holy Grail is 'for the songstress that I guided to receive the greatest honor in the world'. He is mixing you up with the songstress of his past. He becomes emotionally attached to the Master while saying 'what a wonderful lovely voice'. Increases party's Quick performance by 15% while he is on the field

Phantom of the opera costume reference