Sebastian

' "I have no redeeming qualities to be a leader. I just make them do what I want them to do."'  Sebastian (SOLDIER #0 or Zero) is a soldier working under the N.M.E. Foundation. He is the sovereign of the Initiative Unit, and the leader of the S Rank Squad. He is also the biological son of the Headmaster, Seighart. After his father's term, he will be the CEO of the organization in the next generation.

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The sovereign of the Initiative Unit.

Immensely threatening both with

his group and individually. Highly

dangerous to fight. Do not engage

in battle at all costs.

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Description
"See, the N.M.E. Foundation is like a jungle full of wild animals, both predator and prey. Zero is the king of the food chain. With just a blink of an eye, it's either he's already one step ahead of you or he has completely eaten you up without you noticing it." - Sune describes Sebastian

Sebastian is often depicted by other soldiers as a "position-hungry monster" due to his cold exterior to soldiers whose ranks are below him and his continuously growing rank in the foundation. He is an exceptional leader, where he doesn't need to command anyone what he wants them to do, and gets them to understand him and to do his orders just by either simply looking at them or making small hand gestures. This makes Sebastian very quiet, but when he talks, it often involves sarcasm or wise words.

Beneath his rough surface, he does not mean harm to anyone at all. His aloof personality was rooted from his social anxiety, and he finds it difficult to handle situations that requires him to be socially active (e.g. making friends, chatting, small talks, etc.). He tries to make conversations with people, but these attempts of his miserably fail. He also finds disbelief in his own capabilities as a "leader", and doubts how he got chosen to lead prominent teams like the Initiative Unit and the S Rank Squad. He also shows worry regarding the fact that he will lead the whole foundation the moment his father gives him the position. According to the other members of the S Rank Squad whom he is very close to, Sebastian is "nothing but a shy and warm little boy who hides under a hard-to-get attitude". In reality, he is a very sympathetic and caring person especially to the people that matter to him. He just has a hard time showing it.

History
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Sebastian was the son of Seighart Marque with Sophronia Van Fiore, the wife of Saber Van Fiore, a duke of the Sinae Monarchy. Due to the family being of high position, his existence was kept a secret until Seighart mysteriously disappeared, and Sebastian was taken under the custody of the Van Fiore family as Sophronia and Saber's youngest child when he was 4 years old. Although Saber was initially wary of his presence, he continued to take care of the little boy due to the request of Catarina, the only daughter in the family who grew attached to the young Sebastian a few days after he moved in. He later grew to love the child, and began to see him as his own.

He had a happy childhood, being taken care of by the whole family, until he found out that Saber wasn't his real father. He began questioning his identity, with the disappearance of his biological father being a heavy weight behind his back. He slowly lost self-esteem due to thinking that his real father did not love him, yet this didn't stop him from trying to unveil and find who and where his father is. He still remained to be a "son" figure to Saber, and they are quite close as father and son.

Later on, Sebastian was scouted by Victor to join the N.M.E. Foundation even if he was just 97 years old (with the requirement of joining the foundation being 100). Initially confused by how he impressed the organization's board of directors to recruit him, he thought it was a scam before Catarina, his older half-sister, confirmed that the invitation was legitimate. He was later tested, and due to his leadership abilities and immensely perfected skill, he was only trained for a year instead of the regular span of 6 years. He became the Initiative Squad's sovereign, although again, he was in confusion by how fast things were going for him as a soldier.

One day, the Headmaster -- the leader of the whole organization or the CEO -- invited him for a private meeting. In this meeting, the Headmaster was revealed to have been Seighart all along. He also informed Sebastian that he was his child with Sophronia, and began answering the questions that the boy had to offer about who he really is and why he left. Seighart confirmed that he left in order for Sebastian to experience a typically happy and bright childhood instead of going through youth being the center of rumors and issues of affair. He was also the one who ordered the board to scout and admit Sebastian earlier than the rest of the soldiers from his batch. The two reconciled a few months after their talk, and Sebastian became a full-fledged soldier of the foundation with the pride of his biological father's name.

Trivia

 * His human name is Shintaro Luminae. Unlike Catarina (Serafina as a human) who was formerly known as "Sewa", his former name is retained as his current alternate.
 * Sebastian is identified to be bisexual. He is open with the idea of being romantically involved with both men and women. According to Catarina, Sebastian had 6 girlfriends in the past. Although he has never been in a relationship with someone of the same sex, he has stated that he "doesn't have a certain ideal type and the person doesn't necessarily have to be a girl". In Sekai Nitaishite, he becomes interested in Vlad "Thirdy" Astrid III, Valeriana's twin brother.
 * Sebastian is the youngest of the Van Fiore family.
 * He was scouted to join the foundation at the age of 97, which breaks the rule that a demon must be 100 years old to be enlisted to train as an operative.
 * Sebastian is a known contributor to the Revival Project.