Thalia Mendez (known by her alias Emerald) is a criminal member of the ISG universe, portrayed as a deceptively charming yet sadistic figure. Despite her warm demeanor and “girl-next-door” appearance, Mendez is depicted as a manipulative killer whose preferred methods include trampling and poisoning. Mendez was introduced within ISG lore as an outwardly approachable young woman with striking green eyes — the source of her nickname Emerald. She is frequently described as having a “cute” face and a soft, reassuring personality that contrasts sharply with her hidden brutality. Observers within the ISG world note her ability to manipulate others through trust and empathy. Behind the façade lies an individual who takes joy in grief.