Corrin

Corrin (カムイ Kamui) is the main protagonist and player avatar of Fire Emblem: Fates, similar to Robin in Fire Emblem: Awakening. Corrin appears as a DLC character in Super Smash Bros. for Nintendo 3DS and Wii U, and returns as an unlockable fighter in Super Smash Bros. Ultimate.

Character Description
Like Robin in Fire Emblem Awakening, Corrin is the customizable avatar character in Fire Emblem Fates. However, he/she is also the main character of the story and has a more prominent role of an avatar character throughout the whole game. Corrin's gender, physical appearance, voice, stat builds, and secondary class can be selected by the player before playing. Corrin is notably half-dragon, being able to transform parts of his/her body into that of a dragon, or temporarily transform into a dragon with the power of Dragonstones. Corrin and his/her royal families can use Dragon Vein, a power granted from the ancestral First Dragons, which can be used alter the user's surrounding terrain in a multitude of ways.

Fire Emblem Fates centers around two kingdoms: the militant kingdom of Nohr, which is where Corrin grew up after being abducted, and the peaceful kingdom of Hoshido, where Corrin was born. In the beginning of the story, Corrin becomes of age after he/she bests his/her older brother, Xander, in a practice match. King Garon of Nohr provides Corrin with the sword Ganglari to be used on the Hoshidan prisoners Kaze and Rinkah, among others. Corrin succeeds in defeating the prisoners, but refuses to kill them, due to his/her kind personality. Enraged, Garon has Xander kill the prisoners instead, but Corrin refuses to allow it and briefly clashes with Xander, only for the argument to end when Leo "dispatches" the prisoners, secretly weakening them enough not to be killed and convinces Garon to lessen Corrin's punishment.

Garon decides to send Corrin to inspect a Hoshidan fortress above the Bottomless Canyon to pardon his crime. However, one of Garon's men, Hans, provokes the Hoshidans into battle and knocks Gunter, one of Corrin's companions, into the abyss of the canyon. Hoshidan soldiers soon find and capture Corrin, who eventually recognize him as the long-lost member of the Hoshidan royal family. Corrin then meets his blood relatives and the songstress Azura, a former Nohrian Princess raised in Hoshido, at the capital city. However, a hooded assassin attempts to kill Corrin, with Corrin's mother, Queen Mikoto, shielding him at the cost of her life. Distraught at her death, Corrin transforms into his dragon form for the first time and goes on a rampage. During this time, invisible soldiers continue to attack Hoshido; they and the hooded assassin are driven back by Corrin and his allies. Corrin continues his rampage, but is calmed down by Azura, who sings "Lost in Thoughts All Alone" to revert him to his human form. In the aftermath, Corrin comes to possess the legendary Yato blade, which is said to belong to the one who will save the world. Corrin's families eventually meet together in battle, and Corrin is forced to side with either his adoptive family in Nohr, or his blood family in Hoshido, or choose neither side and fight them both. After the battle, the story continues with Corrin returning to his/her chosen family, or if he/she chose neither side, dropping into the Bottomless Canyon with Azura.

Corrin's starts in the Nohr Prince class, a class exclusive to him/her and his/her child, Kana. In this class, they can wield swords and Dragonstones. They can also draconically transform parts of their body to attack when attacking using Dragon Fang skill. With a Master Seal, Corrin can promote to a Nohr Noble and gain the ability to wield tomes, or to a Hoshido Noble and gain the ability to use staves. In addition to this, Corrin has a wealth of other options - he/she can reclass into his secondary class with a Heart Seal, his spouse's base class with a Partner Seal, or an A+ supporting character's base class with a Friendship Seal. As he/she is able to support almost nearly every playable character in the game, this gives him a myriad of possibilities for reclassing. Finally, he/she can use any of the various special reclassing items to access otherwise inaccessible classes, such as the Dread Fighter, Ballistican, or even character-specific classes like Marth's Lodestar class.

Yato
The Yato (夜刀神 Yato-no-Kami) is Corrin's weapon. It is a Katana created by the Rainbow Sage to aid humanity in the war against the First Dragons.

In Fire Emblem Fates, the Yato was one of the five legendary weapons alongside the Fujin Yumi, Raijinto, Brynhildr, and Siegfried, with the Yato being the most powerful and drawing power from its sibling weapons. Following the war, the Yato is sealed away at Shirasagi Castle Town, and loses much of its power because of the kingdoms of Hoshido and Nohr separating the Yato's sibling weapons, with Nohr possessing Brynhildr and Siegfried and Hoshido taking Fujin Yumi and Raijinto.

At the end of Chapter 5, following Azura calming Corrin down, the Yato reveals itself and chooses Corrin as its rightful wielder. The Yato undergoes numerous forms depending on the path taken: the Yato transforms into the Noble Yato and the Blazing Yato when reacting to the Fujin Yumi and Raijinto respectively in the Birthright path, the Yato transforms into the Grim Yato and the Shadow Yato when reacting to Brynhildr and the Siegfried respectively in the Conquest path, and the Yato transforms into the Alpha Yato with the Rainbow Sage's power, and unlocks its true form as the Omega Yato when reacting to all four legendary weapons in the Revelations path.

Corrin uses the Omega Yato incarnation of the weapon for his/her neutral attacks, tilts, neutral, forward, up aerial, pummel, as well as when he/she is charging his/her Forward Smash.