Morbidly obese plus size model for fetishists.Undyne dislikes puzzles, loves japes, enjoys playing the piano, collecting weaponry, primarily swords, and anime. After divorcing Alphys, Undyne began to eat sadness due to which she gained a lot of weight. Then she decided to use her weight to make money by sharing her weight gain progress on fetish sites under the nickname "Fish_Fatness_Queen" which made her binge even more. In appearance, she has pudgy legs, a pudgy ass, her belly is so big it touches the ground, her hands are slightly pudgy, and her face is also slightly pudgy.