Satsuki Asui

Satsuki Asui (蛙吹さつき) is Tsuyu Asui's younger sister.

Appearance
Keeping with her family's froggy theme, she has a tadpole-like appearance.

Trivia

 * When written in hiragana, Satsuki's name can also mean "the fifth month of the lunar calendar," or "May." She shares this connection with her brother, Samidere.