Emerald Sustrai is an antagonist in Project Yellow. She is an associate of Cinder Fall and a partner of Mercury Black.

Emerald initially appears to be affable and disarmingly friendly; however, this belies a darker side of her character. On the whole, she seems to be genuinely outgoing and quick-witted, if a little short-fused. She can also act a little childish or petty, She has a tendency to maintain a pretense of friendliness amongst people in order to gain their trust. Emerald shows a strong sense of loyalty, specifically to Cinder, whom she appears incredibly eager to please. Accordingly, she is willing to take the initiative to impress her, according to Emerald, her loyalty is exclusive to Cinder, rather than to Salem as well, and only complies to her plans and wishes due to owing Cinder "everything".

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