Aki
Aki is Kokoro's close friend. She's very different from Kokoro, but she cares for her and tries to protect her from Kippei, who she thinks will just play with her. Aki is very cheerful and forceful, so she's the loud one of her group of friends. She doesn't like Kippei very much, so she tends to be abusive to him when he gets close to Kokoro.