Ayu Tsukimiya is a fictional character and the main heroine in Key's adult visual novel Kanon, followed closely by Nayuki Minase who is the only Kanon heroine to appear with Ayu on three of the official game covers released by Key. Ayu was created by Naoki Hisaya who wrote her scenario for the visual novel, and designed by Itaru Hinoue. Hisaya commented on how he thought Ayu was the one character in Kanon that he felt he grasped the best, but noted it was very difficult to write her character due to Ayu being primarily energetic. After Hinoue drew wings on Ayu's backpack, Hisaya suggested that they remove them due to spoiler reasons, and while Hinoue went along with it at the time, the wings were later included once again.