Gaia

Gaia is a former criminal turned premonition, and the antagonist of the episode Phantasmic.

Appearance
Gaia takes the form of a sickly, rail-thin young woman with supernatural blue skin and long, light yellow hair. Her head, chest, waist, and forearms are covered by brown rags. Her wrists are locked together by handcuffs, while her feet and waist are chained to iron balls.

Backstory
Born to an abusive and impoverished family, Gaia was lead to a life of crime that ended in her being shot by a cop after killing six officers. She was bound to warn criminals of their fates as a result, but she's slowly planning her ghastly vengeance.

Personality
Gaia is incredibly hostile, and will attack anyone she sees as a target. Whenever she sees someone who has committed an injustice, she gives them two options; either they repent their sins, or she takes them to death.

Abilities
Said to be the most powerful ghost in existence, Gaia has a variety of frightening abilities. She can summon chains to trap her opponents, and use her own iron balls to kill targets. Since she has no corporeal form, she can make herself any shape or size she wants, even if the form defies all known logic. With enough force, she can solidify her body enough to use her enormous size, hence her nickname.