Yuri Haruno attends fifth grade alongside protagonist Chiyoko Kurotori. She forms a trio with classmates Megu Shion and Mai Ichiro, united by their admiration for class representative Shou Sanjou. While generally cooperative, the trio competes for Shou's attention.

Yuri possesses short brown hair and brown eyes. Her typical attire features a mint green dress paired with a pink apron and shoes, though she sometimes wears a pink dress with purple pants and blue shoes.

Her personality is friendly and childish, marked by a strong fondness for sweets. She exhibits moments of fear, particularly concerning inflation, and holds a personal affection for cats.