Yu Takeyama also known as the Mineyama Hero: Mt. Lady, is the No. 23 Pro Hero and member of The Lurkers. Yu is a young woman who seems to enjoy the attention that being a hero gives her. She is also shown to be quite vain. Despite her vanity, she has shown to be selfless. Yu's Quirk, Gigantification, allows her to grow to a gigantic size.She cannot variate between her base-height and the gigantified height achieved via her Quirk, making her only able to be either her normal height or giant size.