Thorn has always lived on the privileged side of life. Though her father Copper and mother Laurel divorced around the time of Coriander's death. She resents her mother, since she has always been expected to be Laurel's "perfect princess" of a daughter.

Her siblings are Amber (who is her primary source of rebellion), Saffron (who is jealous of her), and her brother Thistle (her big brother and best friend).

Around Act III, Thorn goes on a mission to reunite the warring parties of Lagarto Del Valle with a festival of unification.
Dagger eventually helps Thorn and they grow quite fond of each other. Thorn will later find something...alarming about her mother.