Keiko Tanaka is a supporting character in the anime series Amagami. She is a close friend and classmate of Kaoru Tanamachi and often appears alongside her in school scenes. Keiko is known for her cheerful and friendly personality, providing comic relief and a sense of normalcy in the story. While she does not play a central role in the romantic plotlines, her presence helps flesh out the social environment of the main characters and adds depth to the series’ school setting.