Zerus

Zerus, the demon emperor, has the aspect of a small and cute child with dark, wavy hair. She wears a skin-tight suit covering her torso and pelvis, long-sleeve gloves and boots (both with poofy ornaments), a high-collar cloak and a horned headband. Zerus lives in a castle and lords over her demonic minions, including her trusted confidant and childhood friend Lakshal, before Vayne tamed her. She has immense magic powers, and fights using deadly threads that immobilize and decapitate her opponent, a skill she inherited from a spider-demon ancestor of hers. She is extremely prideful and bossy, even after being tamed by Vayne, who ends up giving her back 20% of her power (i.e. 40 levels) after draining it completely.