Signa Alhazen

Signa Alhazen (シグナ・アルハゼン) is a childhood friend of Nayuta Herschel, living on Remnant Island.

Appearance
Signa appears as a young man with long brown hair and dark skin. A patterned collar is worn around his neck. He wears a white sleeveless top with a gold trim and a blue and red geometric pattern alongside pinstriped trousers which open at the shin to reveal boots. Numerous belts are worn on his person- around his waist, torso and several red belts around his thighs. In the end of game, his hair turns into white as an acceptance of his identity as "Serum".

Signa carries a katana with a gold guard and blue gem. A ring adorned the end of the pommel and it is kept within a decorated leather sheath.

Personality
Signa is aloof, but dependable. He's like a brother to Nayuta Herschel, and both are best friends and partners. He has a crush on Asa Herschel, Nayuta's elder sister.

After he merges with Serum, Signa becomes cold, ruthless, and is always insulting Nayuta. But after Nayuta beats him in a duel, Signa becomes his old self again, and inherits a bit of Serum's seriousness.

Background
Signa is one half of the real Serum, who is the elder brother of Creha. After being separated from his other half by the replica of his father, Zext di Quarius Dominador, he was thrown into the earth and was found by Aulbath Alhazan inside his house's basement. Shortly after came into Remnant Island, he met and cheered up Nayuta, who was just lost his parents. Since then, both are always together and become friends alongside Lyra Burton. They also formed a guild in order to help people in need.

Four months prior to the beginning of the game, Nayuta and Signa went away from Remnant Island in order to travel around the world and prove that the world isn't flat. After that, both return to Remnant Island. Signa is thinking about resuming the guild now that they're back. After some talk with Asa, Signa opens up the letter box and goes back to his home. But when Nayuta goes to his home, he only finds Aulbath, who says that Signa is already going somewhere else.

Trivia

 * Fitting Nayuta's star theme, Signa's surname 'Alhazen' is a reference to the 10th Century Islamic Astronomer and mathematician 'Alhazen'. His first name may be a reference to the constellation 'Cygnus- the swan' however the fact the name isn't quite right could be a hint towards his true identity being something else.