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|“||Mercury, I will seriously pay you to shut up.||„|
|~ Emerald to Mercury|
She is voiced by Katie Newville.
Emerald lived in Mistral's city before being recruited by Cinder Fall. She lived day to day without a guarantee of enough food, always resorting to stealing to get by. Cinder saw her use her Semblance to steal a ring from a jeweler and asked her to come with her, guaranteeing a source of food. Cinder later recruited Mercury Black, and the three have traveled together since.
In "Best Day Ever", Emerald appears lost and runs into the shop owner of the newly reopened From Dust Till Dawn, asking for directions to a certain address. As she rounds a corner, Mercury states that he knew she was lost and she offers to pay him to be quiet using money she stole from the shop owner. They arrive at a book store owned by a Faunus named Tukson.
Emerald begins to ask if he has certain books because of his shop's catchphrase, but she eventually asks him for a book he doesn't have. Things turn serious as Emerald reveals that she knows he is planning on running from the White Fang and that he knows why they are there. She asks him if he is planning to fight back and he shouts "Yes" before lunging at her. She ducks under him and Mercury kicks him as he is in the air; killing him.
Emerald and Mercury then return to Roman's base and he questions where they were all day; taking the address from Emerald's pocket without her noticing. Emerald and Mercury confirm that they were cleaning up Roman's mess. When Roman threatens them, Cinder appears and Emerald informs her that they killed Tukson; but Cinder seems more annoyed at their actions as it risks ruining her plan. Emerald then leaves with Cinder, but shows Roman that she managed to steal his lighter.
In "Welcome to Beacon", Emerald is seen with Mercury and Cinder inside Beacon Academy, posing as students from Haven Academy. She bumps into a running Ruby while walking down a hallway. Emerald helps her up, but tells her to mind where she is going. She is then redirected with Mercury and Cinder by Ruby who points them in the direction of their building as transfer students.
In "Extracurricular", Emerald is seen observing a battle between Pyrrha Nikos and Team CRDL, and later Pyrrha against Mercury. Later that day, in a dorm room with Cinder and Mercury, they all begin to talk about Pyrrha's semblance, and how skilled she is, as also listening to Cinder's plan.
In "Dance Dance Infiltration", Emerald and Mercury are seen entering the ballroom together. From here, the duo spends the evening keeping track of the attendees, watching to see if anyone could interfere with Cinder's infiltration of the Cross Continental Transmit Tower. At one point, Emerald warns Cinder that James Ironwood is leaving to check on the tower. However, Cinder is able to finish her task and return to the dance before he can see her. Emerald then lets Cinder take her place as Mercury's dance partner for the remainder of the evening.
In "Breach", Emerald assists Teams RWBY and JNPR in killing Grimm; easily slaying an Ursa using her weapons. She is later present as Adam Taurus appears by Cinder's side, explaining that the White Fang will listen to him, despite numerous losses in the caves.
In "Round One", at the Vytal Festival fairgrounds, Emerald steals Ruby's wallet before returning it to her. She strikes up a friendly conversation with Team RWBY, and it is revealed that she is participating in the tournament alongside Mercury, Cinder and an undercover Neopolitan.
After exchanging pleasantries with Team RWBY, she turns to Mercury and expresses her distaste for all of them, telling him she cannot stand how they always seem so cheery. However, she also shares the intel they had been sent to get: Weiss and Yang will be fighting in round two. Emerald, Mercury and Cinder are then seen spectating the match between Team JNPR and Team BRNZ.
In "It's Brawl in the Family", Emerald is later seen at Cinder's dorm room when Mercury reports Qrow Branwen's presence at Beacon. She asks Cinder if they need to change their plans, but Cinder tells them that they will stay the course. After Cinder gains access to Ironwood's Scroll, she tells Emerald and Mercury to return to their dorms.
In "Lessons Learned", Cinder engineers the next match of the Vytal Festival tournament doubles round: Emerald and Mercury against Coco Adel and Yatsuhashi Daichi of Team CFVY. Emerald and Mercury easily win the match.
In "Fall", after Mercury "loses" his match against Yang and has his leg broken by her apparently unprovoked, Emerald calls out his name and immediately rushes to his side, apparently showing concern for him. This was ultimately revealed to be an illusion created by Emerald, designed to trick Yang into attacking and one of the paramedics into thinking that Mercury's legs are real.
In "Beginning of the End", Cinder, Emerald and Neo evacuate Mercury in an Air Bus to their secret warehouse and head back to the Vytal Festival.
In "Destiny", Ruby sees Emerald in the front row of the Colosseum for the match between Pyrrha and Penny Polendina, even though Ruby was told Mercury's team all went back to Mistral the previous night.
In "PvP", Emerald uses her Semblance to make Pyrrha use her Semblance forcefully on Penny's swords. This causes the wires attached to them to wrap around Penny and split her in half, destroying her. Soon after, Emerald leaves the grandstands of Amity Colosseum.
In "Battle of Beacon", Emerald is seen on a rooftop with Cinder and Mercury, expressing a hint of remorse at the destruction caused by the chaos. Suddenly, she is interrupted by the arrival of the Grimm Dragon, as she remains on the rooftop.
In "The Next Step", Emerald is seen at Salem's Domain surveying its surroundings and accompanying Cinder alongside Mercury. She also acts as Cinder's voice due to the loss of her own speaking capabilities.
In "Of Runaways and Stowaways", Emerald is seen watching Cinder receive "treatment" from Salem. When a Seer enters Salem's meeting room, Emerald is disgusted and fearful of it. After Salem asks Cinder if she really killed Ozpin, Cinder signals for Emerald to help her respond, but Salem slams the table and demands Cinder say it with her own words, which makes Emerald step back.
In "No Safe Haven", Emerald watches Cinder train with Grimm. Upon completing her training, Cinder orders Emerald to create a vision of a kneeled and defeated Ruby Rose, which she mercilessly incinerates.
In "Rest and Resolutions", Cinder arrives at the Branwen Tribe campground with Watts, Emerald and Mercury.
She also appears in the non-canon comedy spinoff series. Here, she works with Cinder and Mercury as an outright but otherwise disinterested villain.
In "Episode 18", she is seen with Cinder, who is plotting in their room at Beacon. Ruby and Nora burst into the room, unknowing that they are evil. Cinder desperately tries to hide a whiteboard with evil plans, but the two heroes are still totally oblivious to it.
In "Episode 19", she makes a brief appearance after being defeated in an evil scheme by Zwei.
In "Episode 20", she tries to hide evil plans and equipment from Neptune and Sun. Later, in a fantasy where world peace is achieved, she, along with the other villains, are extremely distraught.
In "Episode 22", she looks on, embarrassed, as Mercury attempts to get through airport security, but is constantly stopped due to his metal legs.
In "Episode 24", it is revealed that RWBY Chibi was "filmed before a live audience". Emerald and the other villains appear at the end for the curtain call.
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, such as when she stuck her tongue out at Roman Torchwick after she stole his lighter to mock him.
In "Best Day Ever", when she talks to Tukson about books, she seems to be knowledgeable about books and enjoys reading, as she lists off many titles. She also likes Vale, complimenting the city for its "tall buildings and diverse culture".
She has a tendency to maintain a pretense of friendliness among people in order to gain their trust. This is shown on multiple occasions in "Best Day Ever", where she pretends to be friendly to the Shopkeep in order to catch him off guard and steal his wallet. Later in the same episode, she puts on a friendly act around Tukson before threatening and killing him. Another example is in "Extracurricular"; where she mostly ignores Ruby Rose until she looks directly at her, when Emerald off-handedly smiles and then rolls her eyes when Ruby looks away. In the episode "Round One", she states that she dislikes Team RWBY for their cheery and positive attitude, regardless of her acting as their friend for the time being.
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. When Cinder rebukes her for killing Tukson, she defers to Cinder's judgement, quickly apologizing.
Judging from the nonchalant way she talked about killing Tukson, she appears to have no qualms about killing, even lightheartedly joking about it afterwards with Mercury. However, another side of her is seen in "Battle of Beacon", where she seems to be overwhelmed and disheartened at the sheer scale of the destruction and violence taking place, calling it "almost sad".
- Emerald is a gemstone that is most often found in green colors. It appears that Emerald's appearance also resembles that of Cleopatra, who was supposedly cursed by an emerald.
- Sustrai (capitalized) is the Basque word for "thief" while sustrai (not capitalized) means "roots" or "undercurrent." It may also comes from the Spanish word "sustraer" which means "to steal" or "rob".
- Emerald's emblem is a stylized depiction of a cut emerald. This emblem appears on the back of her white top.
- In the episode "Best Day Ever", Emerald is established by her actions and Mercury's own words as a "master thief." Later, Roman refers to Emerald as a "street rat," a term used to describe the title character of Aladdin. It could suggest the basis of Emerald's character, as well as her name making allusion to the phrase "diamond in the rough", which is spoken in the Disney adaptation of the tale.
- In the Japanese dub, Emerald is voiced by Marina Inoue, who also voiced Dark Tohka.