Ume Aoki, known as Ume-sensei in the series 'Hidamari Sketch,' is a quirky art teacher at Yamabuki High School, where the main characters study. She is based on the real-life manga artist Ume Aoki, who is also the creator of the series. Ume-sensei is known for her petite stature, distinct bear-shaped hood, and whimsical teaching style. Though she appears sporadically, she adds humor and warmth, often encouraging her students' creativity and growth in the arts.