Lucifer

Representing the fallen angel Lucifer and the corresponding sin of Pride. Lucifer's appearance is a girl with straight black hair. She is haughty and disdainful, but in fact takes pleasure in surrendering. She is the eldest amongst all of the "Stakes of Purgatory."

[Spoiler] She is the fantasy version of one of the servants that used to bully Sayo Yasuda as a child. [/Spoiler]

(Source: Wikipedia)