The second main character/lord of Shadows of Valentia. The rest is a quote from the Fire Emblem Wiki.

"Celica is a kind and polite person, who is often bold yet refined, but she holds herself back emotionally to an extent after a series of traumatic events and familial loss; as a result, she can come off as cold and stoic, and normally maintain a aura of polite distance, as shown her body language in cutscenes and sprites, which is subtly guarded and closed-off. She usually regrets showing her raw emotions, especially in the rare moments that she lashes out in anger, bitterness, or even sentiment. Celica feels the need that she has to set aside her emotional candor in order to fulfill her responsibilities as royalty."

Celica's english voice is Erica Lindbeck. https://youtu.be/6MsB4vZ0YnM