Emerald Sustrai is an antagonist in RWBY. 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.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, such as tracking down Tukson and killing him.

She pretty much sounds energetic and cool. I'd compare her voice to Korra from The Legend Of Korra.

She has a mid to low ranged voice.