The PC (player-character/protagonist) is the character that the player controls throughout the game's events. Her default name is Mary Sue, refering to the traditional "awesome self insert" character of fanfiction.
As the first game is set in Horse Hall, it is set from the beginning that Mary Sue is athletic and courageous. She enjoys running track and does not like to sing in public. Before the game starts, she lives in New Hampshire with her parents, who are not magical, making her a wildseed. She has no siblings.
Her visual appearance is decided by the player at the beginning of the game, and her skills and some personality traits are shaped during play. Her sexual orientation is also decided by the player.
Her parents are never seen but occasionally send letters.