Hikaru Kamiki

"Ruby Hoshino, you have grown into a beautiful woman. Of course she would, since she's our kid."

- Hikaru Kamiki

Hikaru Kamiki (神木 ひかる) is the primary antagonist of the Oshi no Ko manga series. He is the man that fathered Aquamarine Hoshino and Ruby Hoshino with Ai Hoshino before proxy murdering the latter by leaking her address to a disgruntled fan, prompting his son to devote his life to tracking him down and getting revenge.

Appearance
Hikaru is an attractive and a sadistic man, bearing great resemblance to Aqua. Similarly to Ai, he has star on each eye, although blackened in color.

Personality
Hikaru is a sadistic murderer who enjoys watching the life fade from his victims. When he was just 11 years old, he had a physical relationship with a married adult actress, which could have been what warped him to be the twisted man he is today. However, being a former aspiring actor, he is able to skillfully hide his true nature whilst in public by taking on the persona of a rather casual and dependable individual whom others can lean on. Also, the fact that he bothered visiting Ai Hoshino's grave implies that he truly did love her, albeit in his own twisted way.

Much like his son, Hikaru has shown himself to be highly thoughtful and sophisticated when it comes to enacting his kills. To ensure that none of his crimes could be traced back to him, he usually acts through proxies whom he manipulates into killing his targets for him; for Ai Hoshino, he used a disgruntled fan whilst for the actress he had an affair with as a child he manipulated her husband into committing murder-suicide with her by telling him about their relationship. He also makes sure that his proxies are all mentally unstable people who will commit suicide after their part is played, ensuring that they do not talk. As proficient as he might be, however, both of Hikaru's proxy murders left a single clue that allowed Aquamarine and Ichigo Saitou to trace the steps back to him: the proxies possessed information that only the victims and himself should be privy to.

Over the years, he seems to have become bolder and more daring in his murders, now no longer relying on proxies and killing his targets with his own hands. However, he is still highly cautious, drawing his targets to isolated locations and injuring them in ways where their deaths could be mistaken for an incident, as seen when he pushed Yura Katayose off a mountain whilst hiking in the countryside. He is also highly patient, seemingly shadowing his targets in disguise for a long time until a perfect opportunity arises.

Aside from his murderous tendencies, he appears to be rather haughty and somewhat narcissistic regarding his good looks, believing it is only natural for his daughter to be pretty since she is his child.

History
Much of Hikaru's past remains a mystery. According to Akane Kurokawa's research, he was once an aspiring actor who joined the Lalalie Theatrical Company when he was 10 years old. When he was 11, however, he somehow got into an affair with actress Airi Himekawa, who was already a married adult at the time, and impregnated her with Taiki. At some point afterward, Airi's husband, Seijuurou Uehara, learned of the affair and subsequently committed murder-suicide with her. Since only Airi and himself knew about the affair, Akane theorized that Hikaru leaked that information to have her killed without leaving any incriminating evidence.

Hikaru continued studying at Lalalie for the next 4 years. This led him to meet a 16 year old Ai Hoshino, who was taking acting lessons at the company to start her idol carreer, when he was 15. The two subsequently began a secret relationship, even sleeping together, before breaking up at some point. Through unknown means, Hikaru learned that during his relationship with Airi he impregnated her with Aqua and Ruby.

Private
Before going to Miyazaki for the B-Komachi music video shoot, Ruby Hoshino paid her respect to Ai Hoshino's grave, and Hikaru passed by her, muttering to himself about how beautiful Ruby has grown. He then stood in front of Ai's grave and affirmed that she grew to be beautiful because she was his and Ai's child.

The Main Story
During the Japan Film Awards event, Hikaru passed by Akane Kurokawa, and Akane almost mistook him as Aqua.

Movie
Hikaru appeared as a drinking buddy to actress Yura Katayose, referred as "Miki-san", and listened to her rant regarding her work offer declining due to her getting older. She also revealed to him that she would take a month off to go hiking in a mountain, and Hikaru warned her to watch her step. Later on, Hikaru stood over Yura's dying body, implied to be pushed off by him, and taunted her for not "watching her step".

Known Facts

 * He is referred by Ai Hoshino as "(her) ex", and she later referred to how their children would understand "(their) situation", implying that the relationship between them were mutually broken off.
 * He is implied to have fathered Taiki Himekawa with the married Airi Himekawa secretly.

Etymology

 * The name Hikaru is written in hiragana (ひかる), which has no special meaning. However, when written in kanji (光 or 輝), it could possibly mean:
 * 光 - "light".
 * 輝 - "brightness, radiance, shine, sparkle, gleam, twinkle".
 * Hikaru's surname Kamiki means "god, deity" (神) (kami) and "tree, wood" (木) (ki).

Trivia

 * Hikaru was born in Kanagawa.
 * Hikaru graduated from Faculty of Science.