Miku Izayoi is a Spirit, Idol and one of the main heroines in Date A Live series. She is introduced as a student of Rindōji Girls’ Academy who first manifested in this world in March, and transferred to Rindōji in April. She also works as a very famous and popular idol singer. She hates men to the point that Shidou even has to crossdress in order to interact with her. Her codename is Diva.
Her Angel, Gabriel has the ability to manipulate and brainwash people. She took interest in the undercover Shido because he wasn’t affected by her hypnotic powers and challenged him to a contest in which that if he lost, he would have to transfer to Rindouji. The challenge was for who would earn the title of being the best school. There was a singing contest which was later won by Miku, but the title of best school was won by Raizen High School, which prompted Miku to summon her Angel and attack Shido.
Miku has light blue hair and eyes. Her Astral Dress is mainly yellow in color, with blue and white covering some parts of her dress. She uses a yellow moon hair clip with a flower petal connected to the curve ends of the moon, white flowers and petal can be seen next to the moon hair clip. While wearing a deep blue uniform, she uses a simple, yellow hair clip.
Just like Kotori, Miku was a normal human before she became a Spirit. Her angel is Gabriel, and she has the power to manipulate and brainwash people.
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. Due to her past, in which people that were once her fans (mostly male) accused her of scandals in the past that were not true, leading to her losing her voice from the pressure and caused her to almost commit 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. To the extent of her coldness, even Shido openly admitted he hated her.
She is very flirty, both before and after warming up to Shido, she expresses this towards most women who fit her type (and Shido) and is very blunt about it. After warming up to Shido, she doesn’t hesitate to flirt with both him and the other spirits and does not even mind Shido having a harem, in fact, she pretty much encourages it.
Ever since she was little, Miku loved singing. She wasn’t good at studying or sports, but she could sing better than anyone else around her. As an aspiring singer, she had always dreamed of performing on the big stage. That dream came true when she debuted as an idol singer at the age of 15, under the stage name Tsukino Yoimachi. It was the best thing that Miku could have wished for, doing the very thing she loved and being adored by her fans, she was having the time of her life. Her career however, came to an abrupt end just after about a year when she refused to, you know what, with a hotshot TV producer. Before Miku knew it, false scandals about her began appearing. She soon fell out of favour with her agency. Her fans started to hate her, and Miku thought that she could reconnect everything back with her singing, but she suddenly had lost her voice. As Miku contemplated suicide, Phantom appeared before her and made her a Spirit.
After she was defeated by Shido at her own game she initially rampaged, using her powers to break the rules and simply take what she wanted, despite her being the one to first issue her challenge (and despite her frequently cheating to win), during the course of this she took control of the other spirits, discovered Shido’s true gender, and tried to have the entire city to kill him. However, after Shido and Kurumi muscled their way to her and asked her to stay out of their way while they rescued Tohka from DEM, she took an interest in Shido (she had initially believed no man would ever save anyone for any selfless reasons) and asked his friends what their relationship was.
She then appeared to help Shido and battled with him against DEM, however she claimed that her only intent was to add Tohka to her collection of spirits. She repeatedly tried to prove that Shido was selfish, adherent to her view of all men, by trying to offer him all the girls he wants if he gives into his fatigue and gives up his rescue of Tohka, she’s further shocked when he refuses and eventually is even visibly shocked when Ellen nearly kills Shido. It becomes evident that Miku can’t give up her powers because that would mean she’s returning to her human past, which is itself quite a tragic story, and because she is secretly scared of humanity, which caused the psychological trauma that made her unable to sing in front of people. She finally changed her mind when Shido upheld his earlier promise to protect her and shielded her from Dark Tohka’s power. She is also moved, although initially shaken, when Shido promises her that even if the entire world turns against her, he alone will remain her fan.
After this, Miku decided to let Shido seal her spirit mana and move on with her life, even appearing openly in public as an idol. She has shown great love and affection towards Shido and constantly calls him “darling.” After she was sealed, Miku does not show any more of her previous arrogance, while no longer hate men, she still prefer to be by her female fans more,and she no longer treats women as servants and effectively gave up her power to control people when she was sealed.