Mio Kazama is a supporting character who appears in the 2023 original net animation adaptation of Akuma-kun. She is the daughter of Sanae Kazama and the late Hiroki Kazama, a failed writer who disappeared after making a deal with a demon. Mio is a young girl with auburn hair and brown eyes, and she lives with her mother. While Sanae is portrayed as a gentle and forgiving woman who never pressures Ichiro Matsushita (Akuma-kun) and Mephisto III for the rent they owe, Mio is more assertive and frequently reminds them of their unpaid rent, showing a more practical and less lenient side to her personality. Her role in the series is minor, primarily serving as a recurring domestic presence that highlights the financial struggles of the main characters and contrasts with her mother’s kindness. No supernatural abilities or significant character development are depicted for Mio within the available information.