Hilary Wentworth attends St. Clare's boarding school as a first-form student, belonging to a ragtag group of misfit classmates navigating school life. Her blonde hair positions her within a visual trio alongside brunette Patricia O'Sullivan and redheaded Catherine, reflecting the hair color dynamic among students.

Demonstrating kindness and helpfulness, Hilary embodies her characterization as a nice girl. She engages in shared first-form activities, displaying strong affection for sweets during secret parties and a pronounced positive reaction to animals. Alongside Patricia and Catherine, she discovers a stray puppy on campus and joins their collective decision to care for it, reflecting the group's tendency toward cuteness proximity.