Ayumu Kasuga (春日歩, Kasuga Ayumu?), more commonly known as Osaka (大阪, Ōsaka?), is a character from the anime and manga series Azumanga Daioh.

One of the most influential anime characters of recent years, Osaka is notable for not conforming to the usual stereotypes of an anime heroine: for example in 2003 she was voted 7th in the top 100 poll, "Anime Heroines of 2002" by readers of the Japanese anime magazine Newtype, but was the only character in the top ten who could not be categorised as "cute", "sexy", or "spunky". Instead Osaka is plain, flat-chested, and feeble. Her appeal arises instead from her vivid imagination[citation needed] which comprises a large part of the humor of Azumanga Daioh. Osaka is not only a day-dreamer but in fact tends to fall asleep in class, and her unusual character acts as the foil for the other characters. In real life her unique character has also acted as an inspiration for anime fans[citation needed].

Source: Wikipedia