Hisui Hoshikawa

Hisui Hoshikawa (星川 翡翠, Hoshikawa Hisui) is the son of Hiwako Hoshikawa.

Appearance
Hisui is a young man with chin length blonde hair and two different colored eyes; his eyes were initially blue, but when his powers were awoken, his left eye turned pink/red.

Personality
Hisui is a bright cheerful, mysterious, intelligent and serious person who also acts mature for his age where he is a well-mannered and polite individual.

He is the only one who admonishes Hayato Ozaki where he gets worried about his friends if they are in danger, but he is always prepared to help them and he also treats Tsugumi Kuze kindly and with respect.

Biography
Hisui is an illegitimate child who was conceived by a woman named Hiwako Hoshikawa. Before he was born, his mother was from a noble family which fell into ruin. As a result, Hiwako became a prostitute in order to support herself and it led to Hisui's birth. Hisui spent most of his childhood in the brothel his mother worked at until he twelve or thirteen. He was forced to dress like a woman due to his feminine appearance, which was then when his powers were awakened after he was almost assaulted by a customer. This caused everyone to fear Hisui and his mother disappeared, causing him to believe she abandoned him. In actuality, Mozuyama wanted Hisui to become his human test subject for an experiment, but Hiwako volunteered to take Hisui's place in order to protect her son.

He later met Shiori Tokinomiya who was impressed by his powers and invited him to join "Fukurou" for that purpose. He was dubbed as a "capability person" with special power, because he also has the powers to see "auras". Unlike Tsugumi, he can manipulate the flames.

Tsugumi Kuze
Hisui first met Tsugumi when she joined "Fukurou" after being scouted by Hayato Ozaki and Shiori Tokinomiya where he is kind, polite, shy and friendly with her. He begins to have feelings for her after she helps him find clues regarding his mother. Hisui also blushes when he sees Tsugumi. He also begins to get jealous when Tsugumi is with other boys, especially Hayato. When Tsugumi was kidnapped by Takashi Shiginuma, he infiltrated "Nachtigal" along with Hayato in order to save her. In the end he says that he won't lose to the others and won't give up on her.There are some signs that shows Hisui that he likes Tsugumi, but he might have some hard time expressing his feelings towards her after being grateful finding the truth about his mother too.

Hayato Ozaki
Hisui gets along with Hayato and he is very agreeable with him. They also like to tease Akira because of his blunt attitude. However, he does admonish Hayato when necessary.

Akira Kougami
Not much is known about his relationship with Akira, but he enjoys teasing him along with Hayato due to the latter's blunt personality. Even after learning that Akira was the traitor in "Fukurou", Hisui forgave him along with everyone else since Akira helped them save Tsugumi from Takashi Shiginuma.

Hiwako Hoshikawa
Hiwako is Hisui's mother whom he believed that she had abandoned him. He initially resented Hiwako until he learned from Shouko Shiginuma, who was a close friend of his mother's, why she left him. Hisui was also shocked to learn from Professor Mozuyama that his mother sacrificed herself by becoming his human test subject in order to protect him.

Etymology

 * The name Hisui means "jade" (翡翠). His name also refers to Kingfisher, his theme bird.
 * Hisui's surname Hoshikawa means "star" (星) (hoshi) and "river, stream" (川) (kawa).

Trivia

 * While Tsugumi Kuze who can see "auras", Hisui has the ability to manipulate them.
 * Hisui is half-Japanese and half-Dutch.
 * In the second game "Nil Admirari no Tenbin: Kuroyuri Enyoutan", his biological father was revealed to be a Dutch man named Hans.
 * Hisui's hobby is bird-watching.