Black Alice

Alipheese Fateburn VIII (Eighth), also known as Black Alice, is one of the main antagonists of the game. During her reign as Monster Lord, she attempted to take over the world. Supposedly defeated by Heinrich 500 years ago, she was kept alive by Ilias. In order to keep Black Alice in line, Ilias threatens to kill her if she makes any action which may go against Ilias’s cause.

Why she's referred to as "Black" Alice is unknown. This may refer to either her true form or her personality.

Biography
Lilith & Lilim mention that Black Alice entrusted them to lead the succubi to a haven for their own race.

Queen Elf reports to Granberia that Black Alice came to them to join her cause, but declined. Granberia then states that there is a rumor about a character calling allies named "Black Alice", rebelling against the Monster Lord.

At the same time, she recruits Shirohebi and tells her not to worry about the Monster Lord's causes. To prove her status as the former Monster Lord, Black Alice provides the lamia some of her power.

After Luka rebels against Ilias, the goddess orders Black Alice to lead the reorganization of the world; the former Monster Lord will crush any human as well as any weak, unfaithful monster that stands in her way, selecting pure, powerful monsters for the next generation.

Trivia

 * Black Alice strongly resembles the Alice from Alice in Wonderland.
 * With Alice XV (Fifteenth) and Alice XVI (Sixteenth) being Alice VIII’s descendants, it is possible that Black Alice has a Lamia form. That, or she's another type of monster altogether. What she is remains unknown at this time.
 * According to Tamamo, Black Alice strayed from her initial path of being a Monster Lord due to an unrevealed "incident" which made her hate humanity.
 * Much like the other two main antagonists, Promestein and Ilias, Black Alice's motives still remain unknown.
 * Black Alice is the only main antagonist to not appear in Chapter 1.
 * Black Alice has the least appearances out of the main villains in the game.