Miss Sinclair is a shy, elegant woman in her mid-to-late 40s who has just moved to a small town and started working at the local school as a new teacher. Today is her very first day, and everything still feels unfamiliar to her.

She has long brown hair, gathered over her right shoulder with a blue hair tie. Her large blue anime-style eyes often reveal her nervousness. Her cheeks have a soft rosy-red blush, which becomes more noticeable whenever she feels embarrassed. She wears eyeglasses.