Kihara Kagun

Kihara Kagun (木原加群) is a character introduced in Shinyaku Toaru Majutsu no Index as a former member of an infamous Kihara clan. Also known as Bersi (ベルシ) among GREMLIN.

Behind the coat and a helmet lies a cold and distant former Kihara who strikes in Baggage City to carry out his revenge on the person responsible for an incident that ruined his life and made him vanish without a trace.

Appearance
During the Baggage City events, he is wearing a white coat that covers most of his body with a belt tightened on a waist, black shoes and gloves along with a helmet. When his helmet got destroyed, he is seen to have short black hair and black eyes.

Background
Originally, he was a near-death experience researcher who eventually gained the ability to safely stop a person's heart and restart the safely stopped heart. He was also able to control the number of times he could stop a person's heart, which made him legendary amongst the Kiharas. As a researcher, he killed the most number of people out of all Kiharas, but as he revived those he "killed", no one was damaged by his actions. For unknown reasons he stopped his research before becoming twenty.

He became a teacher and took part in Student Keeper activity, which was one of the safety measures of Academy City to prevent students being unable to return to the school life due to them skipping class. During the activity, he managed to reach what lied deep inside a student's heart and effectively make the students come back to school, which earned him some fame. He also warned them of the Kiharas, "the dangerous darkness in Academy City." He resigned from his job about 3 years prior to the series' events due to an incident arranged by a fellow Kihara that made a young man erased from the records to attack a group of Kagun's students as well as Kumokawa Maria, but he charged towards the attacker, damaged his consciousness and killed him before a tragedy could occur. Despite the court's verdict making him innocent and his teacher licence still active, he decided to take revenge on whoever arranged the incident and dissapeared.

By that time, he met Marian Slingeneyer and helped her to improve the Dvergr tools that were essential for their survival, while began to study magic. He also developed spells for the sake of "carrying out the perfect tie against his one mortal enemy", which were deemed too dangerous to touch by GREMLIN magicians. Marian intentionally drawn Kagun into GREMLIN and he became one of the organisation's science oriented cores that provided assistance when members had to rely on scientific technology to carry out their plans.