Corrin or Kamui in Japan is Fire Emblem Fates's Avatar unit. Corrin in Fates has two major differences compared to previous avatar units. Corrin is the first avatar to not be fully human. They are also the protagonist of the story instead of a major supporting character.
Like all other Nohrian and Hoshidan royalty, Corrin possesses the power of Dragon Vein, being able to alter the terrain around oneself.
Corrin is also a playable character representing the Fire Emblem series in Super Smash Bros. for Nintendo 3DS and Wii Uas downloadable content and in Super Smash Bros. Ultimate.
Corrin was born to Mikoto and Anankos and was of Vallite descent. Soon after, Mikoto left Valla to marry the Hoshidan king, Sumeragi, and Corrin was accepted into the Hoshidan royal family. At a young age, Corrin traveled with Sumeragi in hopes of a parley between Hoshido and Nohr, at the suggestion of Garon. However, Garon laid a trap and killed Sumeragi, then abducted Corrin, making them his child. Since then, Corrin was locked in the northern castle, not allowed to leave it.
Corrin receives a premonition in their sleep on the events that transpire later in the game. Before the dream can be finished, Felicia and Flora wake Corrin up. Corrin explains the dream to them, as well as Jakob and Gunter. Afterward, Gunter reminds Corrin to meet Xander and his siblings Camilla, Leo, and Elise. Xander, concerned for Corrin and their life style, challenges Corrin to battle in hopes of getting them to best him. Corrin eventually does so, and was granted freedom from the castle.
Shortly after being freed, Corrin meets with Garon and is given the Ganglari as a gift from Garon. They are then ordered to kill a small group of Hoshido prisoners, including Rinkah and Kaze. Upon defeating them, Corrin spares the Hoshidan prisoners while Leo and Xander play along with one another's plan and help Corrin release the two prisoners.
The next day after, Corrin asks Garon for his forgiveness and the king gives Corrin their first mission. Xander worries about the man Garon chose to go with Corrin, stating Hans was a convict that Xander had put in prison years ago and was not to be trusted. As Corrin crossed over the bridge over the Bottomless Canyon, they come face to face with Hoshido soldiers to which Hans instigates a battle. After defeating the Hoshidans, Corrin gets surrounded by other Hoshidans and is forced to flee. Hans turns his back on Corrin and send Gunter plunging to his death. In a fit of rage, Corrin begins to tap into their hidden dragon blood and turns their arm into a long spear before they attacked Hans who promptly runs away. Ganglari then works on its own and pulls Corrin into the Bottomless Chasm to die before Lilithappears, turning into a dragon to save Corrin. After being struck by lightning, she opens a portal to the Astral Realm in order to protect Corrin.
Corrin returns back to their world, only to be captured by Rinkah. Kaze appears and brings Corrin back to Hoshido where Corrin meets their mother and siblings. However, due to their earlier childhood memories being nothing more than a deep fog, Corrin feels no connection to their family. A soldier then appears and Ryomatakes Corrin to save his other siblings, Hinoka and Sakura. After saving the siblings, they return back to the Hoshido capital and Mikoto shows Corrin their room. Corrin then decides to walk around the capital to clear their thoughts. During this time, they meet with Azura and find out she was a former Nohrian Princess who was captured by Hoshido and used as a hostage, but Mikoto treated her as her daughter.
After a few days of rest and being in the capital, Mikoto allows Corrin to walk around the capitol more before a ceremony began. At this moment, an invisible man in a cloak appeared and pulled Corrin's Ganglari from its scabbard, plunging it into the ground and causing an explosion that destroyed many buildings and killed people. Mikoto puts her life into risk and saves Corrin by using her body as a shield to protect Corrin. After Mikoto's death, Corrin becomes full of rage and transforms into a Feral Dragon. After the battle, Corrin continues to rampage and Azura sings her song which calms Corrin enough to transform back into their human form. Memories of the past then flood into Corrin and they remember how Garon killed their late father. Corrin then finds out that Yato, a sacred blade, was hidden in the statue in the middle of the plaza and is chosen by the blade to be its wielder. Azura then gives Corrin a Dragonstone to suppress their dragon form in order to keep their humanity.
Hoshido then decides to counterattack against Nohr and Corrin's dream becomes a reality. The two siblings that Corrin grew to love now force Corrin into a decision. Ryoma asks for Corrin's help while Xander asks for Corrin to return to Nohr in hopes that Garon would forgive them once again. The player must then make a choice: side with Hoshido (continuing the Birthright branch of fate), side with Nohr (starting the Conquest branch of fate), or side with neither (beginning the Revelation branch of fate).
If Corrin sides with Hoshido, Xander will attack them in hopes to knocking sense into them, but Corrin refuses, wanting to support their family while stopping Garon's madness. Corrin then helps end the battle by defeating Xander, forcing Nohr to retreat for a time. Corrin is then labeled a traitor by Nohr.
If Corrin chooses to side with Nohr his birth family accuses him of returning just to kill Queen Mikoto. Corrin's Hoshidan family attacks him in an attempt to get Corrin to return to Hoshido, but upon defeating Ryoma the Hoshidans' retreat.
If Corrin refuses to choose a side, both Xander and Ryoma will try to convince Corrin to join them. Corrin adamantly refuses, leading both families to battle against the Corrin. If Corrin, Azura, and Jakob/Felicia manage to successfully defeat to an enemy commander from each kingdom in less than five turns both families will retreat.
In The Legacy of Chris Thorndyke, Female Corrin is Nohr while her half-Brother Kamui (The Male Corrin) is Hoshido.