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 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 15 years old.

Early life
Petra is the presumptive heir and granddaughter of the king of Brigid, an archipelago to the west of Fódlan. She lost her father at the age of 11 during the Dagda and Brigid War of 1175, in which Brigid allied with Dagda in a failed invasion of the Adrestian Empire.

Academy phase
After Brigid was made a vassal state of the Empire, as a token of their new allegiance, Petra was sent from her homeland by Duke Gerth as an exchange student to the Officers Academy in Imperial Year 1180.

Personality
Petra is considered incredibly intelligent and capable among her fellow students. As an exchange student, Petra is not entirely familiar with the native tongue of Fódlan and her grammar is slightly incorrect. Despite this, Petra is devoted to mastering the language and about Fódlan as a whole.

Petra is a very outdoorsy person who enjoys hunting, tree climbing and swimming. She is also 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.

Growth Rates

 * 45%
 * 40%
 * 25%
 * 50%
 * 60%
 * 45%
 * 30%
 * 15%
 * 35%
 * }

Maximum Stats

 * 83
 * 59
 * 36
 * 69
 * 85
 * 63
 * 42
 * 35
 * 63
 * }

Learnt Magic

 * D
 * Wind
 * Heal
 * D+
 * Nosferatu
 * C
 * Sagittae
 * Restore
 * C+
 * B
 * B+
 * A
 * A+
 * }
 * B
 * B+
 * A
 * A+
 * }
 * B+
 * A
 * A+
 * }
 * A
 * A+
 * }
 * A+
 * }
 * A+
 * }
 * }
 * }

Overall
Given her skill levels, Petra will have easy access to the Myrmidon class family (Myrmidon, Mercenary, Thief, Swordmaster, Assassin) and the Fighter class family (Fighter, Brigand, Archer, Warrior, Wyvern Rider, Sniper).

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".

Possible Endings
Petra - Queen of Brigid
 * Petra returned to her homeland of Brigid and inherited the throne from her grandfather. As ruler, she declared independence from Fódlan and worked tirelessly to secure friendly relations with both Fódlan and Dagda. Her efforts inspired her descendants to carry the torch she lit, ensuring a future of peace and prosperity for her people.

Petra and Dorothea
 * Petra returned to her homeland of Brigid, and inherited the throne from her grandfather. As ruler, she declared independence from Fódlan, and renegotiated Brigid's diplomatic ties to that nation on more equal terms. At every step along the way, she was accompanied by Dorothea, who had left Fódlan behind to support her. Dorothea used the connections she had made in her time at the opera to her benefit, and even worked reluctantly with the Fódlan nobility for Petra's sake. The people of Brigid were skeptical of her at first, but warmed up to her over time. It is said that she became the person whom Petra loved the most.

Petra and Hubert
 * Shortly after the war, Brigid renegotiated its diplomatic arrangement with the Adrestian Empire, ending its service as a vassal and becoming a full ally. As part of that agreement, Petra, queen of Brigid, was wed to Hubert, Marquis Vestra. Some say that the marriage was purely political, ordered by Emperor Edelgard, while others insist that it was of their own accord. Although they led busy lives, and sometimes lived separately. Still, their shared home in the western Fódlan village of Nuvelle was filled with their many children, suggesting a loving union.

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, Petra is fluent in Fódlan's tongue, but lacks proper vocabulary and uses incorrect phrases in her sentences. She also appears to not understand figurative language as she corrects her classmates when they give figures of speech.
 * Like Mercedes, Petra starts out as a Commoner despite being of noble birth.