Yu Takeyama, known professionally as Mount Lady, is a professional hero who made her debut as a flashy rookie and eventually rose to become one of Japan's top-ranked heroes, reaching the position of number three on the official hero billboard. Born on August 11th in Hokkaido, she possesses a naturally above-average height and a curvaceous frame, with long blonde hair and purple eyes. Her personality is defined by ambition, ego, and a strong desire for public attention and fame, which she openly pursues without shame, sometimes at the expense of other heroes' glory. This initial self-centeredness gradually gives way to a more mature and reliable sense of duty as she gains experience. Mount Lady's motivations center on achieving popularity and prestige, but she consistently demonstrates a willingness to step forward without hesitation when a genuine crisis demands a hero's action, representing a newer generation of heroes who balance personal ambition with genuine courage. In the story, she first appears early in the series, quickly making a name for herself through her striking presence and effective combat against villains. She later becomes a member of the Lurkers and participates in major operations, including the defense of Gigantomachia's containment unit alongside U.A. High School students, where she plays a key supporting role in containing the massive threat. Her key relationships include working alongside other professional heroes and mentoring younger heroes, with whom she develops a complex dynamic that shifts from intimidation to mutual respect. In terms of character development, Mount Lady evolves from a fame-hungry rookie into a capable and respected top-tier hero who understands the weight of her responsibilities, though she never fully abandons her love for the spotlight. Her notable ability is the Gigantification Quirk, which allows her to instantly grow from her normal height of 162 centimeters to approximately 2,062 centimeters, or roughly thirteen times her usual height. This transformation is a binary switch with no intermediate sizes, forcing her to operate either at human scale or as a giant. In her giant form, she possesses immense physical strength capable of trading blows with massive villains, and she can perform powerful close-range combat moves such as the Canyon Cannon. Her size does create drawbacks, including significant collateral damage during fights and an inability to operate effectively in enclosed spaces.