Sigma

Sigma (シグマ,) are a member of the Decay of the Angel and the general manager of the Sky Casino.

Appearance
Sigma are a young person with long straight hair that reaches their waist. They also have portions of their hair that appear to be in loose spikes and is parted in the middle of their face. The color of their hair's left side is lilac and the right side is white. Their eye color is greyish. They also wear earrings on both of their ears. They are seen wearing a long white coat with black pants. Their coat has a sparkly or galactic design on the interior.

Personality
They appear to be kind to their customers at the Sky Casino, given the fact that they gave a customer another chance by saying that the game is invalid.

They also appear to have a strong sense of ownership. In a conversation with Teruko Okura to close the casino, Sigma refuse and even ask her who will reimburse the revenue and reputation if the casino were to be closed and claim that the casino is their life and their customers are valuable to them.

They act confident and composed even at times of crisis in front of their staff, giving the impression that they're the perfect casino manager and a capable leader. When left alone, Sigma start freaking out and they admit they have no confidence in their skills as a casino manager because of their lack of natural talents.

Because they have no memories, no family and no friends, Sigma's greatest wish is a reason to live. They were also described as implacable by Fyodor Dostoevsky since Sigma are desperate.

Ability
Their ability allows them to exchange information with anyone they touch. The exchange consists of "giving" the personal information a person wants to know and thus giving Sigma the information they want to know.

Skills

 * Leadership skills: As the manager of Sky Casino, they are able to delegate and order tasks properly among their subordinates including taking care of their customers.
 * Memorization: Sigma can memorize the names of traits of their customers, even up to 20, 000 guests. However, it is revealed that they memorize the knowledge of the Sky Casino and their guests since they didn't want to lose their casino.

Background
Sigma themselves were a person born from being written into the Book. When they first opened their eyes and became aware of their surroundings, the first thing that greeted them was not a midwife or a mother but a vast desert filled with nothingness, and their only possession were the clothes on their back and a train ticket from a station that does not exist.

Confused with their circumstances, they wandered around the desert nothingness until they were eventually captured by an armed group and held prisoner, where they eventually unlocked their Gift, causing their captors to then take advantage of their ability for their gain during Sigma's time with them. Eventually, they managed to escape from them and continued to wander the world nihilistically due to not knowing their reason for living or existing.

At one point, Sigma were approached and invited by Fyodor to join the Decay of the Angel. Upon agreeing, they were eventually given the duty of overseeing the Sky Casino, a job they came to love due to it giving them a sense of purpose. Somewhere along their time together with the Decay of the Angel, they eventually obtained information on the location of the "page" of the Book after meeting and attacking Special Division for Unusual Powers director Santōka Taneda using their ability, though they claim that their attack was a mere threat and that they had no intentions of harming him.

Quotes

 * "'We're a member of the Decay of the Angel, a group of superhumans, but we have no fighting ability on our own. We're just a nobody. Apart from the casino, we have nothing […] And for the sake of that casino... we're willing to do anything.''"
 * "Come on... Someone tell us. Is the common person not allowed to protect what they hold dear?"
 * (To Teruko Okura)"You're right. Just as you see... this is all we are. Nobody emphathizes with us. Day or night, we are always alone. Us, protect our "home"? What a joke. But... We can't stop our own body."
 * (To Ango Sakaguchi) "Honestly, we envy those eyes of yours. We doubt we'll ever feel anything with eyes so strong again. [...] In the end, we never did understand what we were born for."

Etymology

 * The name Sigma is derived from the eighteenth letter of the Greek alphabet, and it is usually used in mathematics to mean "sum".

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