Miku Izayoi is the sixth Spirit to appear in the series. She was originally a human that gained the power of a Spirit around the same time Shido first met Tohka. Miku, as an idol, is without a doubt a glamorous girl. She has a voluptuous figure and smooth skin that has never missed physical maintenance. She has long bluish-purple hair in a hime cut with a yellow flower petal hair clip, while her eyes sparkle like silver. Miku's height is stated to be 165 cm, and her three sizes are B94/W63/H88. Her Astral Dress is predominately colored yellow, with blue and white ruffles covering some parts of her dress. She gains another hair clip in the shape of a crescent yellow moon, which is decorated by white lilies. She also wears matching crescent moon earrings and a choker on her neck with another white lily attached to it. Her legs are covered by white tights, and she wears yellow high-heel shoes with lilies on the ankles. While at school, she wears a deep blue sailor outfit. Miku harbors a strong hatred towards men and treats girls as servants fit to serve her, which is why she transferred to an all-girls school, Rindouji all-girls private academy. This stems from her traumatic past, in which people that were once her fans (mostly male) accused her of false scandals, where the loss of her voice from the pressure almost lead to her committing suicide. Even her opinion of women was initially poor, seeing them as replaceable servants at best and not caring if they died, even believing they should be happy to die for her. Her coldness was to the extent that even Shido openly admitted he hated her. Deep down, Miku’s apparent disregard for human life is actually a defense mechanism formed from her troubled past. After learning about her past, Shido concluded that she did not actually view humans as inferior, but instead she feared another betrayal if she treated them as equals. She believed that her value in life was defined solely by her voice, and feared that she would lose it again if she was sealed. She is very flirtatious and lustful, both before and after warming up to Shido, and she expresses this very bluntly towards most women who fit her type. After warming up to Shido, she doesn't hesitate to openly flirt with both him and the other Spirits. Miku also doesn't even mind Shido having a harem; in fact, she openly encourages it. While no longer displaying her arrogance and hatred of the opposite gender, she still prefers to be by her female fans more. Having effectively gave up her power to control people by allowing herself to be sealed, Miku no longer treats women as servants. Instead, she is much more genuine in being openly doting and physically affectionate, much to chagrin of her fellow sealed Spirits. Overall, Shido describes her current personality as very childish.