Aoi is a laid-back, cool-tempered man, and the father of Mitsuki. He was the leader, guitarist, and wrote the lyrics and composed the songs for the legendary band 'Route:L'.  Aoi had a very close relationship with his band mates and friends, especially Takuto Kira, who was an orphan and viewed Aoi as a father figure.      

~!Note:  In the manga, he dies in an accident while trying to get Mitsuki's mother, Hazuki, to the hospital when she was due to give birth.    

In the anime, however, he dies when Mitsuki was one year old.!~      

(Source, Wikipedia, edited)

Twelve-year-old Kouyama Mitsuki was devastated when she was diagnosed with a malignant tumor of the throat. She had made a promise to the boy she loves that she would one day become a singer, but her illness made singing impossible. To make matters even worse, two angels of death, Takuto and Meroko, appeared to Mitsuki and informed her that she only had one year left to live. This news provides an even greater motivation for Mitsuki to fulfill her dreams, and with a little bit of divine intervention, she begins her quest to become a professional singer so she can be reunited with Eichi before time runs out. 
(Source: Anime News Network)

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Played Hisoka in the Hunter x Hunter musicals.

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A Mexican voice actor. He is best known for being the Latin American Spanish voice of Billy in *The Grim Adventures of Billy & Mandy* and Jim Lake in *Trollhunters: Tales of Arcadia*.

Young Mitsuki loves singing and dreams of becoming a pop star. Unfortunately, a malignant tumor in her throat prevents her from pursuing her passion. However, her life turns around when two surprisingly fun-loving harbingers of death appear to grant Mitsuki a temporary reprieve from her illness and give her singing career a magical push start. 
(Source: Viz Media) 
Chapter count contains the oneshot Ginyuu Meika (2nd volume); also includes all interlude and 4-koma chapters of the retail volumes.

Aoi Koga