Yuuko Aioi

Birthday: December 26

Yuuko has short pale chestnut-brown hair, dark-umber eyes, and wears the schools standard girls uniform. She 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.

(Source: Nichijou Wikia, edited)