Fuuka Ayase is a secondary character in the manga series 'Yotsuba to!' (Yotsuba&!). She is the middle daughter of the Ayase family and serves as a neighbor and close friend to the main character, Yotsuba Koiwai. Fuuka is a kind and responsible teenager, often acting as a caring older sister to both her own siblings and Yotsuba. Her friendly nature and gentle demeanor make her a reliable and supportive figure throughout the series.