Momo Yaoyorozu, also known by her hero name Creati, is a student at U.A. High School where she serves as the vice class representative of Class 1-A. She comes from a wealthy, well-educated family and lives in a large house. She is a tall young woman with a mature physique, long black hair often tied in a ponytail, and gray eyes. Her quirk, Creation, allows her to generate any non-living object from her exposed skin by rearranging the lipids in her body at a molecular level. To use this ability effectively, she must have a thorough understanding of the object's atomic structure and composition, which she acquires through extensive study. She can create a vast range of items, from simple tools and weapons to complex machinery and armor, making her a highly versatile support hero. However, she cannot create living organisms, and the process consumes her body fat, leading to physical exhaustion if overused. The time required for creation depends on the object's size and complexity.

Momo is exceptionally intelligent, often ranking first in her class in academic exams. She has a strong analytical mind and excels at strategic planning, but she can sometimes overthink situations, which leads to hesitation in high-pressure moments. Her personality is generally calm, mature, and level-headed, though she can be blunt when pointing out mistakes, as she genuinely wants her classmates to improve. She is kind, empathetic, and deeply cares about the well-being of her friends. This sense of responsibility drives her to take on leadership roles and support her team in battle. Her primary motivation is to become a hero who can protect others and contribute meaningfully to society. She is also known for her occasional moments of airheadedness or unintentionally revealing her privileged background, but these traits are portrayed without malice.

Throughout the series, Momo undergoes significant personal growth. Early on, she struggles with self-confidence and the pressure to perform perfectly, but with encouragement from her classmates and teachers, she learns to trust her instincts and act decisively. Key moments of development include the U.A. Sports Festival, where she demonstrates her creativity and combat awareness, and the Provisional Hero License Exam, where she leads her team effectively. During the Paranormal Liberation War and the Final War arcs, she plays a crucial role by providing tactical support and creating large-scale defensive structures, such as layered armor for multiple heroes. Her ability to adapt and engineer the battlefield makes her an invaluable asset. After the final war and her graduation, she becomes the number nineteen hero, continuing to engage in research and global projects.

Momo's key relationships include her close friendships with Shoto Todoroki and Tenya Iida, with whom she often works in sync during battles. She also has a strong bond with Kyoka Jiro, who introduces her to heavy metal music, which she comes to enjoy. She is respected by her classmates for her intelligence and kindness, and she shares a supportive dynamic with Izuku Midoriya, particularly during the period when he leaves U.A. to face threats alone. Her interactions are characterized by a cooperative and encouraging attitude, consistent with her role as a dependable leader and teammate.