Corrin is the Queen of Valla, the Empress of the United Imperium of Races, and the first dimensionally-displaced organic Daniel Mitchell met after arriving in this galaxy. She accepted Daniel's offer to join his group, until they could (if they could) find her homeworld and family in the galaxy. Eventually, she found her home, but stayed with Daniel, whom she'd fallen in love with, and actually married not long after the Outer Rim Confederation was irreparably crippled at her homeworld, labeled Golmederon.
Corrin is a kind person who cares deeply for the people she loves and will come to the aid of anyone who should ask her for it, rapid-firing apologies if she does something to upset others. Despite having been sheltered throughout all of her childhood, she is quite social and conversational, as well as persuasive to the point of convincing some enemy soldiers to join her cause.
Corrin is quick to trust individuals, but her family has stated that this trusting nature is what makes Corrin so trustworthy herself, and why so many people place their faith in her. While her charisma makes her an excellent leader in skirmishes and she's good at discerning an immediate opponent's strengths and weaknesses, she lacks the vision to handle large-scale battles.
The Avatar has shown strong familial attachments to both the Nohrian and Hoshidan royal siblings, which she said made her unable to choose either one when they tried to force her to choose a side.
As a hybrid between a human and a First Dragon, Corrin is capable of shapeshifting into a dragon form with the aid of a magical stone, akin the Ylakanean race known as the Manakete. Unlike Manakete Dragons, however, Corrin's Dragon form is quadrupedal, usually staying on the ground, and is akin to a winged Gazelle in design. This unique piece of arcano-physiology allows her to shift parts of her body into a 'Dragon Fang', or a portion of her body shapeshifted into something from her Dragon Form (which, despite the name, need not be a fang), allowing her to attack with increased ferocity.
Corrin is a quick learner, and due to the Nohrian Magics she's learned, she can inhibit the abilities of surrounding enemies, regardless of what or who they are, and can even momentarily mimic the abilities of surrounding allies.
Shortly before the creation of Nullifier, Corrin, in a desperate effort to protect Daniel, bonded with the Anti-Venom Symbiote when the radiation attack rendered Daniel comatose. This gives Corrin the ability to turn into Anti-Venom, and possess all of the symbiote's abilities, regardless of whether she's in her humanoid or draconic form.