Nanako Kuroi

Nanako is the homeroom teacher for Konata's class and her primary subject is world history. She thinks that students have it easy because as she has said, "you guys don't have to think about what to wear every day." She is more like a friend than their teacher as she has a lax personality. Consequently, she frequently borrows and exchanges video games with Konata, and is in Konata's guild in the same online game. Since she is not seeing anyone, she is constantly online, even on Christmas and New Year's Eve. Nanako has very long blonde hair which she ties at the back of her neck, and her eyes are green. When writing on the chalkboard, Nanako is able to become ambidextrous.

She loves to watch baseball and is a big fan of the Chiba Lotte Marines. Also, Nanako speaks in a fake Kansai accent.