Yu Takeyama, also known by her hero name Mt. Lady, is a professional hero in the anime series 'Boku no Hero Academia' (My Hero Academia). She is known for her Quirk, Gigantification, which allows her to grow to a gigantic size, making her an imposing figure on the battlefield. Despite her occasional arrogance and love for fame, she demonstrates a strong sense of duty and heroism. Mt. Lady's role in the series is to provide comic relief and to depict the life of a professional hero, while also participating in serious battles against villains.