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 and Ruby with Ai Hoshino, and the person implied to have leaked Ai's address to a disgruntled fan, leading to her death and 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, with his primary targets being actresses. 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 guise 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.

When carrying out his murders, Hikaru appears to be a highly cautious individual careful to leave no incriminating evidence, attacking his victims in isolated locations and injuring them in ways where their deaths could be mistaken for incidents. His modus operandi seems to be to get close to his targets using his public persona and only strike when the conditions are perfect. When younger, he primarily made use of proxies, being implied to have been the one who leaked Ai's address to a disgruntled fan and who told the husband of the woman he had an affair with about their relationship.

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.
 * As noted by Akane Kurokawa, even if he were to be found guilty for his part in the murders of Ai Hoshino and Airi Himekawa, Hikaru will not face serious punishment, since he was a minor at the time. Aqua also understand this, so the best way to punish Hikaru is killing him.