|“||Today, everything's shining brightly! The air, the people, and even this classroom; because today, I actually did my homework!||„|
|~ -Yukko Aioi|
Yuuko Aioi is a main character in the series Nichijou. She is an energetic high school girl with short brown hair.
Her best friends are Mio Naganohara and Mai Minakami.
Yuuko loves making jokes and other people laugh, but often fails with her jokes or delivery. She tends to be clumsy, taking a simple-minded approach to life; she's not academically inclined, not diligent with her homework, and tends to fail tests.
While she is generally an easygoing person, her mood changes instantly if she is insulted. This is similar to Josuke Higashikata.
- Yuuko is constantly persecuted by bad luck regardless of whether or not her laziness was a factor.
- Yuuko's name means "blessed child".