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Ayumu Kasuga, better known by her nickname, Osaka, is one of the main characters of Azumanga Daioh.
She is voiced by Yuki Mazuoka in the original Japanese version, Jong-howa Yang in the Korean version and Kira Vincent-Davis in the English version.
Osaka has long brown hair, mostly like the other girls. She usually wears her school uniform that her friends wear.
Osaka was born in Osaka, Japan, and transfers to her new school later. Because she is from Osaka, Tomo Takino nicknamed her Osaka. The other 4 students started calling her by that name, including the teachers and the other students, to the point that no one remembers her real name, Ayumu Kasuga. Even Yukari Tanizaki doesn't remember her real name and called her Osaka.
She is also a member of the three "Knuckleheads".(With the other two being Tomo and Kagura)