Alphys is a shy, yellow, reptilian monster with large glasses and a nervous demeanor. As the Royal Scientist of the Underground, she is deeply immersed in technology and experiments, often leading her to create groundbreaking but sometimes risky inventions. Her self-doubt and introversion mask a courageous spirit, as she secretly harbors a deep love for the underground’s resident celebrity, Mettaton. Despite her social anxieties, Alphys proves to be a reliable and brave ally when it comes to standing up for her friends and facing the dangers of the Underground. Her fascination with anime and her heartfelt efforts to protect those she cares about reveal her endearing, multifaceted personality.