Fuka Ayase is a kind-hearted and responsible teenager from the manga series "Yotsuba to!" (also known as "Yotsuba&!"). She is the eldest daughter in the Ayase family and often takes on a nurturing role, especially towards her younger sister Ena and the energetic protagonist, Yotsuba Koiwai. Fuka is depicted as mature for her age, balancing her school life with her responsibilities at home. Her interactions with Yotsuba often highlight her patient and caring nature, making her an integral part of the series' exploration of family and friendship dynamics.