Petra

"Yes... I hope, for a future, where the Empire, and Brigid, could cooperate, like this."

- Petra talking to Edelgard

Petra is a playable character in Fire Emblem: Three Houses.

She is a student at the Officer's Academy and a member of the Black Eagles. She hails from a protectorate of the Adrestian Empire. Her preferred weapon appears to be swords.

Profile
Petra is the granddaughter of the king of Brigid, an archipelago to the west of Fódlan. Brigid is a protectorate of the Adrestian Empire, and as a token of their allegiance, Petra is sent from her homeland as an exchange student to the Officer's Academy. She's not yet used to Fódlan's language, but is committed to learning it. She wishes to see a future where Brigid and the Empire can work in cooperation.

Critical

 * "An opening!"

Defeated Enemy

 * "One more success."

Etymology
Petra is a feminine form of Peter, which comes from the Greek word "Petros" meaning "rock, stone".

Trivia

 * Petra shares some traits in common with Athena of Fire Emblem: Shadow Dragon and New Mystery of the Emblem. Like Athena, Petra is a woman from a foreign land who wields swords and speaks the local language with a lack of fluency.
 * However, unlike Athena, Petra is fluent in Fódlan's tongue, but lacks proper vocabulary and uses incorrect phrases in her sentences.
 * Like Mercedes, Petra starts out as a Commoner despite being of noble birth.