Ochaco Uraraka is a student in Class 1-A at U.A. High School and a central character in the final season of the story. She is a young woman of average height with a slender yet curvy build, fair skin, auburn hair, and large round eyes of the same color, and she has permanent pink blush marks on her cheeks. She is originally from Mie Prefecture, and her regional accent occasionally slips into her speech.

Ochaco comes from a family of construction workers who have struggled financially for years. She first wanted to use her Quirk to help her parents with their work, but they encouraged her to pursue her own dreams. She then decided to become a hero so she could earn money and give her parents a more comfortable life. Her modest upbringing is reflected in small details, such as owning an older flip phone while many of her classmates carry smartphones. She is close to her parents and very grateful for their sacrifices.

In terms of personality, Ochaco is warm, cheerful, kind, sincere, and empathetic. She tends to think positively about people and situations while remaining clear-eyed about strengths and weaknesses. She is friendly toward everyone she meets and will try to help or defend anyone who is kind to her or in need. She also has a humorous and expressive side, with exaggerated reactions and a tendency to burst into laughter that she tries to suppress. She is honest and determined, and although she has average intelligence and below-average raw power and speed, her strong technique and willingness to cooperate compensate for those limitations.

Her motivation evolves over the course of the series. She begins with the goal of financially supporting her parents, but through her training and experiences she gradually comes to value saving people above all else. This change is most visible in the final war, where she shows compassion even toward an enemy, and afterward, when she dedicates herself to helping people cope with their Quirks through the Quirk Counseling Expansion Project and by visiting elementary schools across Japan.

In the story, Ochaco enters U.A. after placing third in the entrance examination, behind Katsuki Bakugo and Eijiro Kirishima. Over the series she takes part in the sports festival, internships, and major battles, often working alongside her classmates. In the final war she fights Himiko Toga on her own, awakens her Quirk, and helps rescue many civilians. She is publicly praised as a hero, but privately she carries guilt over Toga's death. In the years after the war she graduates and becomes a professional hero.

Her relationship with Izuku Midoriya is one of the most important in her life. She is his first friend at U.A. and one of his closest companions, and she gives the name Deku a positive and encouraging meaning early in their friendship. She understands him, trusts him, and draws inspiration from his courage, while also serving as the person who pulls him back toward ordinary life. Their feelings for each other develop quietly throughout the story, and in the closing chapters they grow closer, with Deku calling her his hero and the two sharing a moment together.

Her relationship with Himiko Toga is central to her final arc. The two are presented as opposites: Ochaco is cheerful and socially accepted, while Toga is a rejected outcast forced to hide her desires. Rather than simply condemning Toga, Ochaco becomes the only hero who truly tries to understand her, even offering to talk about love as Toga wished. In their final battle, Toga saves Ochaco's life, and Ochaco later blames herself for Toga's death and carries that memory with her into the future.

Ochaco also has strong bonds with her classmates, particularly Tsuyu Asui, with whom she develops a combined attack technique, and she shares a close friendship with Tenya Iida. During her training she works under the professional hero Ryukyu.

Her Quirk, called Zero Gravity, allows her to cancel the pull of gravity on any object or person she touches with the pads of all five fingertips, causing it to float weightlessly. Touching her fingertips together restores gravity and sends the object falling. The Quirk has a weight limit of roughly three tons, and prolonged or heavy use causes nausea. She can also make herself float, at the cost of the same sickness, so she trains extensively, including riding inside a plastic sphere down a mountain, to condition her inner ear and reduce dizziness.

Her hero costume supports her ability with headpieces that limit inner-ear stimulation, a collar meant to reduce headaches, shock-absorbing boots, and wrist devices equipped with grappling hooks. Her fighting style relies on creativity and teamwork rather than direct force. She is known for turning debris into aerial barrages, combining attacks with Tsuyu Asui in which weightless objects are launched into the air and then released to crash down on opponents, and using a technique called Zero Satellites, in which she flings weightless objects with her grappling hooks. She is also noted for her endurance, acrobatic ability, martial arts skill, and tactical thinking.

During her final fight with Toga, her Quirk awakens. She gains the ability to make targets weightless without touching them, surpasses her previous weight limit, and can affect many people at once across a wide area, allowing her to neutralize a large number of enemies and save countless lives. Her awakened power greatly expands her capacity to rescue people and control the battlefield.

Over the course of the series, Ochaco matures from a cheerful student focused on school life and her family's finances into a wiser and more capable hero. Her later actions, particularly her attempt to reach Toga and her postwar work in Quirk counseling, show her carrying forward Toga's memory and striving to prevent others from suffering the same fate.