Nanako Kuroi

Nanako Kuroi is the homeroom teacher for Konata Izumi's class and her primary subject is world history. She is more like a friend than their teacher, as she has a relaxed personality. She frequently borrows and exchanges video games with Konata, and they both play the same online role-playing game. It is mentioned on multiple occasions that Konata is a tanker while Kuroi is a wizard who only does AOE skills. She is also online regularly, even on Christmas and New Year's Day. A running gag within the series is whenever Konata and Nanako are both online together, Nanako tells Konata to stop slacking off, but then continues to slack, herself.