Kihara Kagun

Kihara Kagun (木原加群) is a character introduced in Shinyaku Toaru Majutsu no Index as a former member of the infamous Kihara clan, and a key member of GREMLIN as Bersi (ベルシ).

Knowledgeable in both science and magic, he plays a key role in the workings of GREMLIN, who uses science and magic hand in hand. 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.

Etymology
As a notable trend among the Kihara family having given names related to science and mathematics, his given name (加群) can be translated as Module. Meanwhile, his Bersi alias is derived from the relatively little known (to the English-speaking world) Kormak's Saga of Iceland, which is related to his magic.

Appearance
During the events in Baggage City, he is seen wearing a white coat that covers of his body with a belt tightened around his waist (with the belt buckle bearing a serpent or a dragon), black shoes and gloves, and most notably a white helmet that obscures his identity.

He is a rather tall man, with a lean build, almost adrogynous. When his helmet got destroyed, he is seen to have black eyes, and short black hair, which was somewhat spiky, though not to the extent like that of Kamijou Touma or Tatemiya Saiji.

Personality
He is a Kihara, as such he has a natural affinity to science and the gravitation towards evil. However, he somehow managed to overcome both of this, becoming a magician, as well as helping the audience of Natural Selector, and other characters. Yet, he is still a Kihara regardless, as he displays his deviousness, having manipulated events in Baggage City as so he can face Kihara Byouri equally, as well allowing for the events of Radiosonde Castle, and the invasion of Hawaii to take place. Therefore, he is considered to be like the other Kiharas—he is someone who will let nothing get in the way to achieve his goals, even if he is good.

It is hinted that he had an intimate relationship with Marian Slingeneyer, his mentor in magic.

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. He ended his research after realizing that since he could kill and revive people easily, regardless of the reason that the value of human life remains the same, it would always be judged at a very low baseline. Basically, he felt that with his skill over life, it could be compared to that of a child turning a television on and off.

He later became a teacher, which was easy as he had erased his past as a Kihara. As a teacher, he 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 corrupted a young man erased him from the records to attack a group of Kagun's students (which included Kumokawa Maria). 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 from Academy City.

By that time, he met Marian Slingeneyer and helped her to improve the Dvergr tools that were essential for their survival, 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. At this time, Marian bonded with Kagun, and clearly cared for him as a colleague, and is described as being her partner, telling him to return to her if he has finished his vengeance, unaware of the meaning of his version of revenge.

Baggage City Arc

 * Main article:Baggage City Arc

He intercepted the scope of the invasion force Academy City would be sending (and from here, knew of Kihara Byouri's participation), and later made the final adjustments for the experiment to give GREMLIN a better advantage. He and Othinus alone, knew of the the true extent of the experiment and what the GREMLIN was getting into. He first appears in the early parts of the distortion that occurs in Baggage City with Academy City and Science Guardians forces. Here, unwittingly saves Shar Berylan from an attack of a Five_OVER Modelcase Railgun, defeating it by only using his fists.

Kagun reappears at the heat in the battle between Oumi Shuri and Kihara Enshuu. He aids Shuri against Kihara Enshuu, where the latter realizes that he maybe a Kihara Kagun. During the fight, Enshuu charges towards Kagun, to which he responds by using a convex landmine, and reminds Enshuu on how the action he was doing is what it means to be a Kihara, detonating the mine in close range, but due to its shape, it protected Shuri and Kumokawa Maria who was with her, unconscious. However, Enshuu got away, and Kagun was forced to used his magic as protection against the blast, regardless the battle was over. Shuri hesitating in trusting Kagun, draws out her kunai spade, but Kagun tells her that she will not to be able to defeat him with too much strength. Kagun states that he is a specialist of Kiharas, and he doesn't want to fight. Finally, he advises her to meet Kamijou Touma if she wants to survive. He later tells that he has his own objective and that he will not be able to protect them, as he is a Kihara himself. Unaware to him, Kumokawa Maria was searching for him the entire ordeal.

During her conversation with Sigyn, Marian references calling "Bersi" as she was tired of all the work he has to do. Bersi himself appears before Marian Slingeneyer afer her retreat from her fight with both Kumokawa Maria and Oumi Shuri, who is elated at his appearance.

Finally, after the defeat of Kihara Enshuu at the hands of the combined efforts of Kumokawa Maria, Saflee Opendays, and Oumi Shuri, he finally meets up with Kihara Byouri. He stops her attempts at killing the three, and as a price, has his helmet destroyed, revealing his identity to her. Here, he reveals that he has manipulated events, in order for Byouri to lose all of her safety devices, o he can fight her on the same level, and as proof that he had killed her. Kagun blames Byouri for corrupting the attacker of his students that forced him to kill him in front of them. The attacker was a pawn prepared by Byouri many years ago, in order to force Kagun in giving up becoming a teacher that is looked up to, someone who is so unlike a Kihara, and now redemption for him is to kill her.

She attacks him with her projectiles, as her Skyfish form, but Kagun goes unscathed after getting hit by her. Here, he reveals his power, a laser balde that he held between two of his fingers, demonstrating his power by severing her right arm. However, Byouri then reveals another of her transformation, Yeti, allowing her to form a gigantic furry arm and tries to crush Kagun, however, he lives and remains unscathed. This confuses Byouri, not knowing how Kagun is able to achieve such a queer power that is beyond her knowledge in science. With her Skyfish form, Byouri attacks Kagun, hitting him but remains uninjured. Kagun attacks Byouri still, and pulls her down to the level where he was tried to be crushed by Byouri using his Yeti transformation. While she was preoccupied with figuring out Kagun's powers' relation to science, Kagun manages to "shift" her head, something that should be certain death, however, she once again reveals another form, Little Gray. This transforms her limbs to exapand into a large blob. Using this, an explosion occurs and engulfs Kagun, though he remains uninjured his clothes are torn, while Byouri is damaged yet is quickly recovering, at the cost of her becoming deformed due to her transformations.

Byouri then conjectures that since Kagun is using powers beyond her ken of science, she believes that may be a part of GREMLIN. Determing his weakness, Byouri attacks a non-fatal blow upon Kagun, and hither she realizes she is correct. Kagun confirms this by stating that his power, Whitting creates miracles that allow him to survive if he is faced with a great disadvantage, making him avoid damages. Kagun continues that the number 2 Level 5, may be taking over her, as the reason why she only used her power until only the very end. Suddenly, Byouri transform again into Loch Ness, forming into a giant monster. Seeing this, Kagun reveals that he is not planning to win, and would rather have a stalemate were the both of them die. An explosion occurs, and the both of them fall into Maria's path, and here, a severely injured Kagun stabs Byour's monster head, and wrenches it off clean from its body.

Maria seeing his teacher again, runs towards him, though he is unable to focus on her as he collapses on the ground. Kagun looks up to Maria, and simply said sorry to her as he dies. Maria could only shout and cry and try to remind her dead teacher that he has saved them and are grateful to him, and what he has done wasn't futile. More importantly, Marian witnesses the death of Bersi, her partner, as well breaking down completely, despite the warnings of Othinus, she begins to start using Dáinsleif.

Near the end of the arc, after the great many events that had passed after Marian used Dáinsleif, and was later defeated by Kamijou Touma. Othinus later revives Kagun as an Einherjar, and have him carry Marian, where after she comes to, recognizes him by the nostalgic feel of his skin and scent. Despite Othinus making Kagun's actions in vain, Marian does not protest, as she is too tired. They later discuss their future plans while walking in the snow, while the walking dead Kagun carried Marian.

Abilities
Named after the Icelandic saga character known as Bersi, Kihara Kagun wields the sword known as Whitting (ヴィーティング), wielded by Bersi in his duel against Kormak. It is described in the saga as "a sharp sword, with a life-stone to it".

When in battle, the sword scatters when an owner is at a disadvantage, and amongst them, a miracle would occur, a spell that could accurately avoid damage and cause the sword to be sharper. When both are assembled, the sword's destructive power will increase exponentially. The sword appears a bluish lazer sword that Kagun holds between his fingers.

This maybe based on the outcome of the battle between Kormac wielding the sword Skofnung and Bersi wielding Whitting. In the battle, Kormac drew his sword incorrectly, draining the luck out of his blade, and it chopped off the top of Bersi's Whitting, and the tip cut Kormak on the thumb. Therefore, Bersi won the duel as he had drawn first blood.

What's more, with his knowledge of the human body, Kagun could apply damaging techniques to his advantage, as what happened with the killer he attacked.

Design evolution
Haimura's design of Kagun remains the same overall. Originally, Kagun had a black colored theme, and had unnecessary lines tacked on him, though this was later removed in the finished design.

Quotes

 * (When questioned why he ended his research from NT volume 4)"Even when I get the results, the price I had to pay doesn’t match."
 * (To Kihara Byouri from NT volume 4)"I said it right from the beginning. I would take revenge for the boy whom you degraded into a murderer. I came here for this. In that case, victory wouldn't matter. You, who prompted that murderer, and me, who killed that murderer; once we continue to fight, my aim will be achieved."
 * (To Maria before dying from NT volume 4)"Sorry..."