Toyoda-san, known as Dolores in English adaptations, is a recurring character in the third season of the anime, set in Okinawa New Town. She exhibits a quiet, reserved demeanor, speaking infrequently and maintaining a serious disposition. Academically inclined with a strong aptitude for mathematics and science, she immerses herself in complex equations and scientific concepts. Her intellectual interests extend beyond STEM; she possesses Latin knowledge enabling text translation and monitors events like the "Petite Queen" competition. She displays a subtle sense of humor, occasionally engaging in light pranks, such as one directed at Yuna on a bus.

Socially, she interacts sparingly with classmates, forming a primary genuine connection with Yuna Kamihara. She collaborates with Yuna to counteract Jessica's bullying tendencies, notably devising a plan involving a fabricated monster legend during a school trip to unsettle Jessica. She holds distinct respect for Dr. Jumba Jookiba's intellect, admiring his spacecraft designs and collaborating with him on projects, including creating a faux monster for a school event. However, she experiences moments of intimidation when confronted with equations beyond her comprehension, such as those presented by Jumba and Pleakley. She openly regards Stitch as disruptive despite generally treating him well. Her rivalry with Jessica stems from a belief that Jessica and her friends use bullying to mask low self-esteem.

Her character development unfolds across key episodes. Upon Yuna's transfer, she is seated next to her in class and reacts with surprise upon noticing Stitch. During an interschool academic competition, she initially expresses confidence but suffers elimination after Experiment Spike temporarily diminishes her intellect, leading to emotional distress and a beachside kidnapping by Dr. Jacques von Hämsterviel, Gantu, and Reuben before rescue by Stitch. She later participates in a repechage round, contributing to her team's victory. Aspiring to become the youngest astronaut in human history, she journeys to find a wishing flower on an island expedition, relying on a compass for navigation and disregarding misleading signs.

Personal vulnerabilities emerge in "A Very Stinky Christmas," where she discusses mathematical problems with classmate Lionel, hinting at romantic feelings; she becomes embarrassed when Yuna observes her preparing a gift for him. She faces challenges including being pranked by Experiment P.J., temporarily regressing to toddlerhood due to Experiment Babyfier, and being consumed by Experiment Fudgy during a chocolate factory incident. During a confrontation with Experiment Dark End, she actively supports Stitch alongside P.J. and Squeak. Her skills are highlighted when she solves an equation posed by Experiment Flute, winning a bet that compels him to dance upside down. In a supernatural encounter, she translates a Latin warning about a contained witch; Stitch accidentally releases it, leading to a climactic confrontation resolved using her knowledge of the witch's mirror weakness.

Physically, Toyoda-san presents with light skin, dark gray hair secured by two blue hairpins, and standard school attire consisting of a white shirt and black skirt. Her design shares similarities with Taro, a character from earlier seasons, including glasses and reserved personality traits, though Toyoda-san displays broader academic interests compared to Taro's biological focus. Her original Japanese surname is Toyoda, while the English adaptation assigns her the given name Dolores.