Corrin is the third child of the Hoshido royal family, with their mother being the queen, and their father being a dragon's discarded heart. When Corrin was a child, the neighboring kingdom of Nohr killed the king of Hoshido, who wasn't Corrin's real father, and kidnapped them, raising them as Nohr royalty. Corrin then spent most of their life, up until their late teens, living in a Nohr fortress and being unable to leave to fight alongside their siblings in the war against Hoshido. When they were finally allowed to leave the fortress, Corrin was tasked with killing Hoshido prisoners, but they refused out of kindness. This led to the king of Nohr setting them up to be killed for treason, but before Corrin could die, they were rescued by a Hoshido prisoner they'd saved earlier, and brought to the royal family. The queen recognized Corrin, and revealed to them their true lineage. However, with tensions between Hoshido and Nohr rising, Corrin must pick between their birth family, and the family that raised them for most of their life.
Dragon Fang: A power that lets Corrin change partially, or completely, into a dragon. While needing the Dragonstone to maintain control of themselves in full dragon form, Corrin can partially transform into a dragon during combat and revert in an instant. They can morph their arms into claws, wings for flight, extending spear-like appendages, and even dragon mouths that spit balls of water as projectiles.
Dragon's Vein: An ability exclusive to Hoshido and Nohr royalty, which allows alteration of terrain. It can be used to create new pathways, dry up rivers, lower mountains, freeze enemies for a turn, or create spots that heal anyone who stands in them.
Enhanced Senses: As a half-dragon, Corrin has an enhanced sense of smell, sight, and hearing.
Longevity: Due to their dragon heritage, Corrin lives far longer than an ordinary human.
Omega Yato: The final form of the Yato sword, a legendary blade that chose Corrin as its sole wielder. As such, only Corrin can wield it. As the Omega Yato, it is the Fire Emblem of the Fates universe, with the ability to slay immortals. The blade of the Omega Yato acts as a chainsaw, shredding into anyone it cuts, and reduces the effects of a dragon enemy's scales, letting it do more damage against them than other enemies.
Dragonstone: A magical stone used by the Manakete tribe to switch between human and dragon form at will. While not a Manakete, Corrin can still use the stone to transform into their full dragon form without the risk of losing control of themselves, and letting them revert to their human form afterwards. The Dragonstone + is a more powerful variation that boosts Corrin's dragon form's power when used to transform.
Dragon Form: The full extent of the Dragon Fang ability, which lets Corrin fully become a dragon with the use of a Dragonstone or Dragonstone +. As a dragon, Corrin gains the ability of flight, has claws and horns to rip and tear into enemies, and has minor hydrokinesis, which can be used to summon pillars of water from the ground.
Torrential Roar: Corrin's Final Smash. After knocking the target away with columns of light, Corrin morphs into their dragon form and blasts them away with a swirling maelstrom of water.
Hoshido Noble: After reaching a certain level, Corrin can use a Master Seal to change classes. One of the classes they can change to is the Hoshido Noble. As a Hoshido Noble, they gain the ability to wield healing staves and rods, along with the skills Dragon Ward, which gives allies a chance to take only half damage from an attack, and Hoshidan Unity, which adds 10% to Corrin's chance of activating a skill.
Nohr Noble: The other class Corrin can change to is the Nohr Noble. As a Nohr Noble, Corrin can wield magical tomes and scrolls for a variety of magical attacks, and gains the skills Draconic Hex, which weakens the enemy considerably after a clash with Corrin, and Nohrian Trust, which lets Corrin use the skills of any person they're paired up with at the time.