Kamijou Faction

The Kamijou Faction (上条 勢力) is a "new group" which technically doesn't exist. However, the possibility of the "faction" becoming a proper entity is "feared" by certain individuals in the magic side such as the Etzali (initially) of the Return of the Winged One, since it might destroy the actual balance of power between the magic and science ; the group "violates the regular rules" existent in current organizations since "it's composed" of espers, magicians and regular people who were allied with Touma, contrary to most organizations that use only magicians, only espers or only people unrelated to either side in their operations.

Initially the group is mentioned by Etzali and after that, it's name is never mentioned by any other characters except Lessar as the story progresses, so it's name can be considered as non-canon, but the individuals' connection with Touma are canon.

Background
Excluding Index, Touma meets his allies unexpectedly, and they help each other in many situations. Their connection with Touma were formed due to many reasons such as they have feelings for him (Misaka Mikoto and Itsuwa), they have respected him (Stiyl Magnus and Kanzaki Kaori respected him for saving Index), their lives were saved by him (Himegami Aisa and Lessar), they were encouraged by him despite they were not human (Misaka 10032 and Kazakiri Hyouka), and changed their ways of living after being defeated by him (Accelerator and Hamazura Shiage). Most of them were affiliated with Necessarius or the Magic Side.

Etzali pointed out that the most troublesome thing about the group was that they took radical actions in order to solve problems and thus "couldn't be ignored", Etzali also pointed out that every member allies himself to the group out of their own volition, beliefs and conviction, and thus they would never betray Touma, can't be bribed out of the group and would not switch sides regardless of the consequences.

Allies
The individuals below are not 'members' but rather people who were connected with Touma. Most of these people used to lead a hard live, contained dark secrets, had a sad life, and they once being lonely because of their abilities, which were the main causes of some of them became antagonists. However, Touma helped them even if they refuse his help. Because of him, their lives were changed and they had become trustworthy allies which helped Touma in battle or other situations (except in his unlucky peaceful daily life and his homework). They are also grateful to Touma and believed in his strength. One of the evidences is confirmed, like his friend Tsuchimikado Motoharu who once warn Aleister that if he want to use Touma for his unknown but selfish plans, Touma will break down Aleister's illusions.

Their relationships with each other in the story are normal (sometimes in a comedic way) when it is peaceful. But when a crisis occurs, they seriously helped each other so they can return to those peaceful days. Individuals like Etzali, Sherry Cromwell, and Vento of the Front were never seen helping Touma, but they used to fought him and they were defeated by him. After that, they changed their ways of living and had their own reasons for providing support.
 * Index
 * Misaka Mikoto
 * Stiyl Magnus
 * Kanzaki Kaori
 * Himegami Aisa
 * Misaka 10032 (and by extension, all the other remaining Misaka clones)
 * Accelerator
 * Tsuchimikado Motoharu
 * Kazakiri Hyouka
 * Orsola Aquinas
 * Tatemiya Saiji
 * Itsuwa
 * Agnese Sanctis
 * Lucia
 * Angelene
 * Last Order
 * Hamazura Shiage
 * Lessar
 * Leivinia Birdway
 * Patricia Birdway
 * Mark Space

Abilities and Powers
One of the dangerous attributes of the so called group is the diversity of the individuals involved with it. Some individuals possesses unique powers or ability which makes them have names for themselves. Because of that, they attracted many people who wanted to obtain or use those powers for different purposes.
 * Kamijou Touma possesses his Imagine Breaker which can nullify anything related to supernatural.
 * Index possesses 103,000 grimoires inside her which makes her targeted by many magicians.
 * Kanzaki Kaori is a Saint, which there are only twenty of them in the world.
 * Tsuchimikado Motoharu is a Magician-Esper hybrid, the only successful one in the world.
 * Himegami Aisa is a Gemstone and possesses the ability "Deep Blood," which attracts and kills vampires.
 * Accelerator is the most powerful level 5 esper in Academy City and he is also at least an Angel-class when in his "Awakening" state.
 * Misaka Mikoto possesses the Railgun ability which makes her third most powerful Level 5 esper in Academy City and a very skillful electromaster.
 * Kazakiri Hyouka possesses an AIM Field Manifestation (Artificial Angel) with a power level at least an Angel-class.

Index Arc
Touma meets Index, and later meets Stiyl and Kanzaki. Kanzaki revealed Index's continous memory loss to Touma. Touma revealed the 'truth' to Stiyl and Kanzaki and they combined their efforts to save Index. After that, Index, Stiyl and Kanzaki changed their opinions about Touma. Index learnt about Touma's memory destruction so she tried to help him remember and later confessed her feelings to him while held back her tears. However, Touma managed to fool her.

Deep Blood Arc
Touma and Index meets Himegami Aisa. Index managed to persuade Touma to keep Sphynx. Touma 'meets' Stiyl and learnt about Aureolus Izzard and Aisa's secret. Aureolus Izzard reveals his plan and his past which involved Index. Touma defeated Aureolus Izzard and rescued Aisa. In the end, Aisa started to develop feelings for Touma.

Sisters Arc
Touma meets Misaka 10032. Later, he come across Misaka 10031's corpse and meets the Sister Clones. Touma later found out Misaka's dark secret and managed to convince her not to fight Accelerator. Touma managed to stop Accelerator from killing Misaka 10032. The real Misaka later arrived to see the battle. Misaka and the Sister Clones managed to help Touma in order to defeat Accelerator.

Angel Fall Arc
Touma and Index temporary leave Academy City and headed for the beach. The next day, Touma meets his father. However, Touma noticed everyone's appearance have changed except him. Touma later meets Misha who attempted to eliminate him but Kanzaki and Tsuchimikado made it in time to stop her. They explained to Touma about the Angel Fall and Tsuchimikado revealed that he was a member of Necessarius. The next day, Touma is looking for the culprit and came across his family photo. Knowing his father's appearance has not changed, Touma searched for him and soon confront him at the beach. However, he doesn't know anything about the Angel Fall. Misha soon appears but Kanzaki arrived in time and revealed Misha's true identity. While she faced Misha, Touma and his father reached and entered their house and Tsuchimikado suddenly appears. Tsuchimikado revealed the truth and knock out Touma and his father. Tsuchimikado completed his spell and destroyed Touma's parent's house. In the hospital, Tsuchimikado revealed his true nature and abilities to Touma. Finally, Touma gets to see his mother's true face.

Three Stories Arc
Etzali says that his superiors considered a threat to Kamijou Faction.

World War III Arc
While they were in the military truck in Russia, Lessa says that doesn´t this so that the considered part of the Faction Kamijou

Trivia

 * There are evidences that in the Magic Side mages and organizations believe that this faction is very dangerous and influential; while others want to join.
 * Etzali was one of the first to point out the danger that the so called group represents, regardless of that he ended up "allying" himself with the ideas faction.
 * After Lessar mentioned the 'Kamijou Faction', she said that she does not want to be a part of it. However, she did not abandon Touma and kept on assisting him during his journey to save Index. Her journey with Touma is solid evidence that she is one of Touma's allies.
 * It is unknown why Leivinia and her organization saved and assist Touma, but it is possible that they want to get Touma's trust so they can use his power and his allies in order to achieve their goals quicker. It is also possible that they found him by coincidence.