AurEtra

AurEtra is the het ship between Oluo Bozado and Petra Ral from the Attack on Titan fandom.

Canon
While it is unknown when, Oluo and Petra were recently hand-picked by Levi to be in his squad, and were among the few Scout members to get over 45 Titan kills. While Oluo looks older, it is implied he and Petra (and the rest of their squad) are around the same age, which is early 20s. Their first interaction is filled with tension, when Oluo tries to impress their new scout Eren and acts tough, and accidentally bites his tongue. Petra notices and comments on it later, while Oluo tries to wash the blood out of his mouth by the well inside the castle walls, adding that he shouldn't even try as he's nothing like their captain and calling him a fool. Eren stands not far from them, and he seems surprised by the way they speak to each other. Petra says that it's no wonder he bit his tongue as he was talking while on a horse. She notes that he's never acted like this before, meaning they've known each other for quite some time. Oluo pretends he doesn't know what she means, and says that if she wants to act like his wife and scold him, then she skipped a few steps. After, Levi tells them that they need to clean the castle up in order to rest, which they do. Later that night, the squad listens to Levi explaining what they're going to do.

During the 57th Expedition, Oluo and Petra are informed of the Female Titan coming from the right flank, leaving them to move out. They then hurry inside the forest, where Annie is starting to catch up with them. Oluo and Petra beg Levi for orders, and are the two most obviously stressed out. When Eren says that he'll transform, Petra and Oluo beg Eren to trust their captain and commander's decisions and move froward. Eren obeys, relieving them. After the Female Titan is successfully captured, Levi leave and orders them to switch to their gear and head up the trees.

There, Eren wonders if he can really trust Erwin and Levi, angering both, to which Petra yells at him, and Oluo asks her to bash his teeth in. When the signal is fired, they are glad to see that they can go back home. On their way, Petra mentions that they've only made it through thanks to Eren trusting them. Oluo retorts by saying that the only thing he did was moan and groan, stirring yet another argument between the two. Eld then mentions how the two pissed their pants on the first day out, making them both mad. They has apparently bonded over that.

They then cross Annie, who kills Gunther by slicing the back of his neck open. Still, they work perfectly well, even after one of them dies. Both Oluo and Petra perfectly slice the Female Titan's eyes open; and work well together. Still, Petra is eventually stepped on, while Oluo yells at her to get higher and escape. Oluo, both angry and devastated, attempts to avenge her but is kicked hardly enough to die.

When at the end of the main story the Titan power is undone, and Levi sees the visions of his fallen comrades, Oluo and Petra appear together standing closely side by side.

Fanon
Despite not having many interactions in the main story, AurEtra is rather popular within the AOT fandom. Despite this, it is greatly rivaled by Rivetra, which, involving Petra, clashes with AurEtra. Due to it's canoncial status (Oluo having feelings for Petra), it is a more popular ship. In fanfiction often appears as a background couple to other pairs that involve any Survey Corps members.

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Trivia

 * In the AOT official Guidebook, Isayama described them to be like “an old married couple”.
 * Petra's birthday is December 6th, Oluo's — January 6th.
 * They're often seen in official art together.
 * The Attack on Titan guidebook describes Petra's and Oluo's argument as a "lovers' quarrel."
 * According to Isayama, the two come from the same batch of trainees.

Conversation in Attack on Titan Handbook

 * Q: You two came to a very shocking end.


 * Oluo: I let that Titan win. You don't seem to understand: beating a Titan isn't necessarily the best way to get noticed.


 * Petra: The Female Titan was a tough enemy, so I can't be surprised at what happened. But if the captain was in that situation...


 * Oluo: Hah. With the right methods, there's nothing I can't defeat—


 * Petra: Hey! Are you trying to imitate the captain yet again?!


 * Oluo: You're the one who followed me, Petra. But don't you think it's a little early to be acting like my wife?