Rashta is a major character in The Remarried Empress, a South Korean romantic fantasy story originally serialized as a web novel by Alphatart and later adapted into a webtoon and a live-action series; the property has no animated anime adaptation, and descriptions of her are drawn from the novel and webtoon versions of the story.

She is introduced as a strikingly beautiful young woman in her early twenties, with an innocent, angelic face, very fair skin, long wavy silver-white hair, and dark eyes that have occasionally been described as gray. Her figure is slender and petite, and her hands carry visible scars from years of manual labor during her enslavement. Early in the story she favors simple, light-colored dresses that emphasize her fragile elegance, but as she rises in rank she begins to dress in increasingly extravagant clothing, partly to imitate the polished image of the previous empress.

Rashta's background is central to understanding her. She was born into slavery because of crimes committed by her father, and grew up working in the household of Viscount Lotteshu Rimwell. During that time she entered a secret romantic relationship with Alan Rimwell, the viscount's son, and became pregnant. When the child was born, it was taken from her and she was given the body of a dead infant, leading her to believe her baby had died. In truth, the child was kept hidden by the Rimwell family. After Alan abandoned their plan to elope, an older fellow slave who was fond of her helped her run away. While fleeing, she was caught in a hunting trap and discovered by Emperor Sovieshu, who took her in and eventually made her his mistress, and later his empress after his divorce from Navier.

In personality, Rashta presents herself as naive, warm, and fragile, an image that conceals a cunning, ambitious, and opportunistic nature. She is highly skilled at winning people's sympathy and at manipulating the emotions of those in power, particularly Sovieshu. She is also impulsive and short-sighted, frequently lying or making rash decisions without considering the consequences. Beneath her charm she is deeply insecure, anxious about public opinion, and paranoid about anyone discovering her past. She tends to interpret every situation in extremes, believing that she either remains in the palace or returns to a life of slavery, and this all-or-nothing mindset makes her lash out violently at perceived threats.

Her motivations grow out of that fear. She desperately wants to be loved, accepted, and secure, and she craves the luxury, attention, and status that her new position provides. The thought of being exposed as a former slave, or as the mother of a hidden child, terrifies her into increasingly destructive behavior. She also loves her child and is protective of her position, seeing any rival as a danger to everything she has gained.

Within the story, Rashta serves as the primary antagonist and a foil to Navier. She is the concubine brought into the palace at a time when the imperial couple is struggling to produce an heir, and her presence destabilizes the court. Her relationship with Sovieshu is the direct cause of the emperor's divorce from Navier, which in turn sets up the central conflict of the series. After the divorce she marries Sovieshu and becomes empress of the Eastern Empire, but her reign is brief and increasingly marked by scandal.

Her key relationships define much of her arc. Sovieshu is her rescuer, protector, and eventual husband; she depends on his favor and constantly worries about losing it, though her fear ultimately leads her to betray and publicly humiliate him. With Navier, she first attempts to befriend the empress and even asks to address her as a sister, but jealousy and rivalry quickly replace any pretense of friendship, and she comes to see Navier and her family as enemies. She has a tense and distrustful relationship with Prince Heinrey, whom she once tried to deceive by claiming to be his secret correspondent. She is also manipulated by the nobleman Ergi, who encourages her schemes before later threatening her. The Viscount Lotteshu, her former owner, continues to treat her as property and blackmails her using knowledge of her past and her surviving child, while Alan Rimwell remains tied to her history as her first love and the father of that child.

Over the course of the story, Rashta's behavior escalates from petty lies and self-victimizing performances to serious crimes. She spreads false rumors about nobles, misuses imperial documents left by Navier, orders the imprisonment of a maid and has the woman's tongue cut out to silence her, and later plots kidnappings and even hires thugs to assassinate members of Navier's family. Her machinations eventually unravel during her trial, where she attempts to drag Sovieshu down with her by accusing him of being unable to father children and of engineering the succession plot himself. She is stripped of her title, her marriage is annulled, and she is locked away in a tower, where she dies after taking a poisonous pill given to her by an unknown person.

Rashta possesses no magical powers or combat abilities. Her strengths lie entirely in social manipulation: her beauty, her talent for appearing innocent and victimized, her emotional intuition, and her ability to make people pity her and take her side. She is also adaptable enough to imitate aristocratic manners and fashions, though she never truly masters court politics and lacks the strategic patience of her rivals. Her tragic quality comes from the fact that her fear of losing everything drives her to commit the very acts that destroy her.