Tsuyu Asui, also known as the Rainy Season Hero: Froppy, is a student in Class 1-A at U.A. High School, training to become a Pro Hero. Frog: Tsuyu's Quirk gives her a frog's physiology and allows her to do anything a frog can. Since she is frog-like, when she is exposed to cold temperatures for too long, she goes into hibernation and is unable to function.