Emerald Sustrai | Thief's snack

Emerald is a young woman with medium-brown skin and dark-red eyes. Her hair is a light, mint-green with a straight fringe and bangs as well as two long locks on each side in the back.

She wears two bronze-colored rings on her middle fingers as well as a pair of strappy high-heeled pumps. She is stated to be in the age range of a Huntsman Academy student.

Originally, her attire consisted of an intricate white top and an olive-colored crop top, on the back of which is her personal emblem. This emblem is in the shape of a cut gem, most likely referring to her name. This was intended to be accompanied by white shorts, decorated with what appears to be a gold coin-plated belt with four gold chains draping around her back from two of the coins and what seems to be a green loincloth.

She also wore a gold, three-ring armband on her left arm and a string of gold beads near the same wrist. As of Volume 2, her outfit has changed somewhat. Her top has thinned, her crop top is now shallow-cut, and her armband and beads no longer seem to be made from gold. She also sports white cropped pants with brown chaps that attach to her brown belt.

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 has a tendency to maintain a pretense of friendliness around people in order to gain their trust, she dislikes Team RWBY for their cheery and positive attitude, regardless of her acting as their friend for the time being.

According to Emerald, her loyalty is exclusive to Cinder, rather than to Salem, and only complies to her plans and wishes due to owing Cinder "everything". Accordingly, she is willing to take the initiative to impress her, such as tracking down Tukson and killing him. When Cinder rebukes her for doing so, she defers to Cinder's judgment, quickly apologizing.

Although she has no qualms about killing, judging from the nonchalant way she talked about killing Tukson and even lightheartedly joking about it afterward with Mercury, she does get a bit seems to be overwhelmed at the sheer scale of the destruction and violence being caused during the Fall of Beacon. Nevertheless, Emerald continues to demonstrate loyalty to Cinder.

Emerald seems to be quite adept with her weapons, demonstrating skilled swordsmanship and marksmanship, demonstrating the ability to ensnare opponents in her chains and reel them in, even from a great distance, even bringing down Ruby despite the latter using her scythe's recoil for extra speed.

Emerald is stated by Mercury to be a master thief, and she has proven that she is adept at pickpocketing, with one victim being Roman, stealing his lighter to show him that she was a capable thief after he mocked her.

Weapon Emerald's weapon of choice is Thief's Respite, a pair of dual-wielded pistols that can also be converted into a pair of kama, the blades of which can detach and be swung from chains as kusarigama.

Emerald's Semblance, Hallucinations, is individual mental hallucinations - the ability to modify the sensory information in a person's head while their brain is processing it. Her Semblance is not limited to biological opponents, but can also affect mechanical ones. Emerald's Semblance also seems to limit her mobility, unlike Neopolitan's; she typically remains still or moves slowly and cautiously when conjuring hallucinations.