Ayumu Kasuga is a main character in the anime and manga series Azumanga Daioh. Originally from Osaka, she quickly earns the nickname 'Osaka' from her classmates. Ayumu is known for her slow-paced, absent-minded personality, and her quirky, surreal sense of humor. Despite her daydreaming nature, she is kind-hearted and often surprises others with her unique perspective. Throughout the series, Ayumu provides comic relief and serves as an endearing, memorable member of the main group of friends.