Senju is a young woman of below-average height with short light pink hair, green eyes, and prominent eyelashes, sharing similar facial characteristics with her older brother, Haruchiyo Sanzu. Due to her layered tousled bob hairstyle with unruly waves and blunt edges, she is often mistaken for a boy.

Senju wears a white sailor top with a red necktie and a matching light blue skirt that ends right above her knee. She sometimes ties her hair in a well-kept bun and allows her bangs to freely cascade down the sides of her face. To complete her school outfit, she wears a pair of school shoes and white mid-calf socks for footwear.

She was just walking down the sidewalk, looking around as she did so.