Petra is a playable character in Fire Emblem: Three Houses. She is a student at the Officers Academy and a member of the Black Eagles. She hails from Brigid, a vassal state of the Adrestian Empire. At the start of the game, she is fifteen years old. A political hostage of the Adrestian Empire and native of Brigid, Petra is a highly intelligent, capable girl among her fellow students. Because of her foreign origins, she is not a native speaker of the Fódlan language and makes slight grammatical errors, but still wants to learn more. She is unaware of Fódlan colloquial speech and will often take idioms and figures of speech by their literal meanings. She does not like the fact that Brigid is a vassal state and that she is being used as a hostage to blackmail the kingdom into submission, and so she tirelessly works to improve herself in every way possible in hopes of one day forcing the Empire to recognize Brigid as an equal. This work ethic was praised by many of her peers. Her dislike of her and her country's position does not extend to the people she knows personally and she is good friends with most of her classmates. She's calm most of the times, and rarely, if ever, loses her patience. Dorothea, in her C-support with Petra, says that Petra is the princess that every little girl wants to be. Petra loves being outdoors in nature and enjoys hunting, tree climbing, and swimming. She is quite fond of her homeland's many beaches. Despite her studious nature, she's not fond of math. She also has an open dislike of discrimination.