Kihara Kagun

Kihara Kagun (木原加群) is a character introduced in Shinyaku Toaru Majutsu no Index as part of the 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, 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 the dead the total number of damaged people was 0.

In his teens, he erased the record of becoming evil as part of Kihara, but for unknown reasons he stopped his research before becoming twenty. Once asked for the reason, he said: Even when I get the results, the price I had to pay doesn’t match , which could indicate that he realised the value of the lives he manipulated.

After he abandoned the research, 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. While in that position, he became able to "broke the wall in the hearts of the students", which was granted him the respect and gratitude among his students. He also warned them to get away from the Kiharas, "the dangerous darkness in Academy City." Despite his achievements, he resigned from his job about 3 years prior to the series due to an incident arranged by a fellow Kihara that made a young boy to attack a group of Kagun's students as well as Kumokawa Maria, but he managed to kill the boy in a way the boy would not feel pain. Despite the court's verdict making him innocent and his teacher licence still active, he vanished without a trace.

By that time, he met Marian Slingeneyer and helped her to improve the Dvergr tools, while he 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.