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. She has large eyes, similar to her sister, Tsuyu's, with three upper eyelashes and notably small eyebrows. She has light-tanned skin and her mouth is usually set in a pout-like shape. Her dark green hair is worn in low pigtails.

Personality
Satsuki can be inquisitive sometimes, since Tsuyu is the only one in the house taking care of her younger siblings whenever their parents are working out. Nonetheless, she is caring for her sister.

History
Satsuki is the youngest daughter in the Asui family and the youngest sibling of Tsuyu.

Whenever Tsuyu's mother, Beru and father, Ganma had to travel for work, Tsuyu would be the one to give some time to raise her younger siblings. Tsuyu was left with the responsibilities of raising the brother, Samidare and Satsuki, such as making dinner for them. While watching an interview of All Might, she asks Tsuyu what is for dinner, and the older sister replied that it's pasta. Although it was tough raising her younger siblings, Tsuyu still found her life to be wonderful.

Tsuyu Asui
Tsuyu is her older sister who has watched over her and her brother while their parents are away. Not much else is known about the relationship between the two at this time other than it being likely they are on good terms.

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, Samidare.