Sorscha is described to be pretty, but not stunningly beautiful, with chestnut hair woven into a braid, stunning brown eyes flecked with green, and a golden-tan skin tone suggesting at least one member of her family must have been from Eyllwe. Dorian notes that she moves like water.
Sorscha is extremely shy and tries to make herself inconspicuous, tending to tacitly observe than to act directly. Sharp-minded and intuitive, Sorscha can easily piece together bits of information to form accurate inferences. These qualities render her a decent spy. However, she is also insecure, and her meekness makes her a favorite target of Amithy's bullying.
Sorscha is also kind and devoted, as she not only serves as a healer but also agrees to help Dorian learn to control his magic at great personal risk. Despite her rancor with the King of Adarlan, she loves Dorian deeply and is willing to make sacrifices for his well-being.
Sorscha treats Chaol's, Dorian's, Aelin's, and Fleetfoot's wounds after their battle with the monster in the catacombs, though at this point in the storyline, her name is still unknown to the other characters.
Sorscha heals Dorian's wounds after he tangles with a rosebush. Dorian inquires about her life story, and she tells him that she and her parents hailed from a village in southern Fenharrow, and that after their village was destroyed, they moved to Rifthold, where her parents were killed in the immigrant purge. When Dorian questions why she works in the glass castle, Sorscha replies that she has nowhere else to go. The following day, Dorian sends for her and asks her exactly where her village was so that he can mark it on his personal map of Erilea.
Dorian regularly visits Sorscha after his training sessions to have his wounds tended. While she treats his injured wrist one day, they banter before Sorscha inquires about the wellness of Aelin and Fleetfoot, who, Dorian assures her, are well. This allows Sorscha to broach the subject of what inflicted Fleetfoot's wounds, as she believes that Fleetfoot was attacked. Dorian divulges that there were two different monsters: the ridderak, which Aelin dispatched, and the monster that he, Chaol, Aelin, and Fleetfoot encountered in the catacombs. Sorscha asks if the King would punish Dorian and his friends for the incident with the monster, to which Dorian replies that his father would. Dorian's magic begins to flare up; unaware of his struggle, Sorscha states quietly that the King would kill Aelin and Chaol too, and realizes that his friends' safety is why Dorian concealed the event from his father. Her musings feed Dorian's panic, causing him to lose control of his magic. Towards the end of the book Dorian's father gives the order to kill Sorscha because she wouldn't give him the information he wanted and she was thus beheaded in front of Dorian, Aedion, and Chaol.
Sorscha had a crush on Dorian for six years, since she came to the glass castle, but she was certain that relationship would never happen. However, Dorian took notice of her in Heir of Fire when he visited her to have some wounds bound. He recognized her and asked for her name. When she tended another wound of Dorian's shortly afterward, he asked about her life, then sent a messenger the next day so that she could tell him where her village was so he could mark it on his personal map of Erilea. Sorscha later discovered that Dorian had magic powers and began helping him learn to control it. A relationship blossomed, and Dorian and Sorscha became lovers. Following the purge at Calaculla, Dorian, concerned for Sorscha's safety, panicked and attempted to offer her money and supplies so she could flee, but Sorscha refused, insisting that they stayed together. Chaol and Aedion worked on an escape plan for Dorian and Sorscha so they could leave the King behind together. Sorscha expressed concern that she was unfit to be queen and that she might have to leave Dorian one day, but Dorian loved her with all his heart. Eventually, Sorscha was revealed to have leaked information about the King to the rebels. Dorian attempted to bargain with the King for his lover's life, but the King callously beheaded Sorscha, causing Dorian to fly into a fit of rage and grief and unleash his powers.