Sfaira

Sfaira is a monstrous Avian woman who's responsible for the downfall of Avia and the death of the Empress.

Appearance
Sfaira has glowing red eyes and dark purple hair and her arms and legs form wings and bird feet from her thighs and shoulders down. Her sharp fingernails and talons are black. Her attire consists of a dark grey bandeau top and loincloth, tied with a gold ring and string. She also wears gold armbands on her upper arms.

Before her return to take over Avia, Sfaira had purple eyes. She also wore a dark grey cloak upon her departure from Avia and also wore it during her return.

Personality
Sfaira has shown herself to be very ambitious, and refuses to admit to failure. She didn't hesitate to fight the Empress for the Avian throne and has been shown to urge Pomum to not fail on her next attempt to capture Violet.

Abilities
Sfaira's abilities haven't been fully explored yet, but it is shown that she's extremely powerful.

The Empress of Avia
The Empress and Sfaira were childhood friends, but Sfaira became lonely from the then-Princess's constant training. She then ran away from Avia, and returned centuries later demanding that the Empress gives her the throne. When the Empress doesn't comply, Sfaira transforms into a monster and kills her in battle.

Violet Aetos
Although Violet's relationship with the Empress of Avia is still unclear, Sfaira has seeking her out in hopes to truly gain the title of Empress.

Pomum
Sfaira is Pomum's master and commander. Although she has strong faith in her favorite soldier, Sfaira will remind Pomum that she does not accept failure from her.

Trivia

 * "Sfaira" means "sphere" or, alternatively, "bullet" in Greek.
 * Sfaira's appearance and behavior is similar to that of a harpy from Greek mythology, and it is likely that she is indeed one.