Azurrin

Azurrin is the non-binary ship between Corrin and Azura from the Fire Emblem fandom.

Canon
Corrin first meet Azura singing in a lake, when Corrin is kidnapped and brought to Hoshido, an enemy nation. There, Azura explains that she was a princess of Nohr that was kidnapped by Hoshido, in a similar situation to that of Corrin's, and that she was always happy in Hoshido despite technically being a hostage. Corrin is eventually releaved to be the missing child of the queen of Hoshido.

During a celebration of Corrin's return at the capital square, a merchant asked if Azura is Corrin's girfriend while they look at an open market. In the same event, Corrin's weapon is detonated by a hooded man and kills most of the people attending, including Mikoto. Azura bears witness to Corrin's transformation into a mindless dragon. She then warns Corrin to avoid the Wyrmslayer-wielding mercenaries and assists them in defeating the Hooded Man. After the battle, Azura uses her powers to revert Corrin back into a human, even though she is nearly killed by the feral Corrin in the process. Corrin is confused about their dragon form, thus Azura gives them a Dragonstone, telling them that it will allow them to turn into a dragon again but will also keep their mind intact.

Azura joins Corrin's journey regardless if they decide to align with Nohr or Hoshido. If paired up, they eventually have two children, Kana and Shigure.

Fanon
Azura and Corrin is one of the most popular ships in Awakening. The pairing is just possible in canon if Corrin is male, though female Corrin x Azura is quite popular as well.

Trivia
It's eventually revealed that Azura's mother, Arete, was a sister of Mikoto, making Azura and Corrin cousins.