S

"So it was you, Kira! Apologize for what you did!"

- S, Investigator S: Reverse Quantum Curse

S (小 Esu) is the main character of the mystery series, Investigator S. She was born in the late 1800s in Victorian England. She was chosen by The Agency to become a detective, after being observed for years.

History
S was born in the late Victorian era in England. She lived a normal life up until the age of ten, when her parents were both killed by Kira. When S was young, she was close friends with Violet. The two would often play together, until S's parents were killed. At that point, S distanced herself from people for about a year. When she got better and came to play with Violet, she had disappeared. Although she was forgiving and had gotten over their death very quickly, she still had lingering emotions in her mind about the killer. S learned to live on her own, afterward. Later on in her life, she was chosen by a group known as The Agency, where they told her of her fate as a detective. She worked against crime, always striving to discover her parents' slayer. Her life continues as such until an important event takes place that changes her fate.

Appearances
The only canon appearance of S in any game is in the Inverstigator S series. All others are not canonical to the timeline of the game at all.

Investigator S: Reverse Quantum Curse
The girls are offered jobs from The Agency, an organization from the future. After accepting, the two find themselves battling with the forces of XGen. After discovering the true purpose of The Agency, both girls are stunned. They learn that The Agency came back in time to stop Kira from taking over England.

S is sent to the future by the powers of Kira. In the year 3005, S meets the new Agency, and tells her story. After obtaining a Cross Stopwatch, S is able to travel back to her time. She discovers that the entire Agency has been taken over by Kira.

After realizing that Daka has been taken hostage, S defeats Kira in battle. Once she is defeated, it is revealed to the girls that, through the destiny of time travel, all of those born in the future after Kira has taken over will be erased from existence. All members of the Agency who came from the future disappear at this point, leaving the girls depressed.

Three years later, in Violet War, S has taken over the Agency, and changed it into an organization to protect the world from all forms of evil. No more of the plotline of Investigator S has been revealed to this point.

Investigator S: Violet War
Three years after Reverse Quantum Curse, S has become the new leader of The Agency. Daka co-leads the new Agency with S, and they have now become a simple crew of detectives to protect the world and solve peoples' problems. Not much more of this game's plot has been revealed.

Physical Appearance
S has long, dark hair. She has somewhat pale skin, and wears a blue, long-sleeved shirt and a long, dark blue skirt. She usually carries around a tan messenger bag. She also wears brown shoes. This is the normal uniform for Agency members.

Personality
S is forgiving and kind towards everyone. She is very interested in solving mysteries, and enjoys reading books quite a bit. She dislikes vegetables, and loves sweets. Also, S dreams of traveling to distant lands someday, but her job prevents her from doing so. S shows that she loves all forms of life. However, whenever she meets Kira, she has quite a trouble holding back her anger and need for revenge.

Boss A.
S met Boss A. soon after her parents died. Boss took her to The Agency, and completed her training on his own. Boss usually shows to really like S, and S seems to like Boss as well. In a respectful way, S usually calls Boss A. "Leader" when talking to him.

Kira
As Kira is the one who killed S's parents, S has serious trouble holding back her hatred for Kira. The two meet up quite a bit, and Kira constantly taunts S. S always calls Kira "Meanie", showing that she dislikes her in the least rude way. Kira always has to hold back her want for killing S, as well, for XGen's plans require her to be alive.

Daka
Daka is S's closest friend. The two joined the Agency at the same time, and instantly became best friends. The two often go on cases together, and play games together as well. The two hardly ever get in arguments, and Daka is kinder to S than she is to any other person she knows. It is hinted at that Daka has a crush on S.

Violet
S and Violet were close friends during their childhoods. They would often play together, read to each other, and study together. Once S's parents died, S became depressed and distanced herself from others. Violet and S never met again until Investigator S: Violet War.

Rose
S and Rose become close friends after Rose's joining of the Agency in Violet War. Rose always looks up to S, and the two often work together to get mysteries solves. S and Rose are similar in the ways that they both don't have parents. Rose's affiliation with Colora changes their relationship a bit.

Trivia

 * S's name is shown to mean an abbreviation for the word "superior", as she has superior powers compared to the other members of the Agency.
 * In the future that Boss A. comes from, it is told that S had died at birth.