Kotori Mizuki is a character in Yu-Gi-Oh! ZEXAL. She is a friend of Yuma Tsukumo. Due to her unyielding personality, she tends to prod Yuma about his screw-ups. She's friends with Akari Tsukumo and Haru Tsukumo. She has absolutely zero clue about Dueling. She thinks Astral is a spirit.