Jigen

is the leader of Kara.

Background
During Kawaki's childhood, Jigen bought the boy from his father with a large sum of money. After taking custody of him, Jigen introduced himself as Kawaki's new father, while telling him he could make himself at ease now. He would later attempt to transfer Kāma to Kawaki and fourteen other boys, with Kawaki being the only known success and thirteen dying outright. Jigen put Kawaki through gruelling training so he'd master the Kāma, and would constantly berate him as only having value as a vessel for the Kāma, striking the boy whenever he questioned him.

Personality
Jigen appears to be formal and courteous, addressing the fellow members of his organisation politely before beginning their meeting, and even extends his manners to his enemies, as he politely greeted Naruto Uzumaki, and apologised for having not removing his shoes when entering the Uzumaki household. He is even willing to avoid conflict if people are willing to agree to his terms. He does have a serious and authoritarian side to himself, as he is fully capable of commanding respect among the group, to the point even the prideful elderly Inner and hot-tempered Delta are easily silenced by him. He is very composed and systematic in his approach to matters at hand. Even when dealing with momentary failure, he remains determined as ever, convinced that all will fall into place as he designed it. While apparently less confrontational than Delta, as he tried to only incapacitate Naruto rather than fight him, along with having been willing to let Naruto off the hook when Kawaki offered to come back willingly until Naruto made it clear he won't stand by it, he is shown to be very confident in his abilities, calmly declaring his intentions to eliminate the Seventh Hokage for his interference. He is not above praising his opponents, commenting Sasuke Uchiha for his intellect and the efforts of Naruto and Sasuke that forced him to unleash his full power. Even when showed his weaknesses, he calmly thanked his foes instead of lashing out for revealing it. At the same time, he has shown an irritable side, as when tasks fail to reach his expectations, he can lash out, as he kicked a broken tank after another setback to his plans. He is also shown to be a perfectionist, viewing his work on Kawaki and his Kāma as work of great importance, disgusted to see his adopted son's damaged right arm using a prosthetic and quickly voiced his intention of restoring Kawaki's arm.

He is also shown to have a very amoral and remorseless side, caring not in the slightest at how many innocent lives he must sacrifice to obtain his goals. His single-minded nature views all his actions towards Kawaki, no matter how harsh, as truly in his best interest. Apparently, he views a peaceful world as foolish, likewise feeling the same way about Naruto Uzumaki. Although he appears arrogant, Jigen is very cautious and secretive, capable of keeping the full scope of his abilities secret even from his allies. He's very perceptive and deceptive, as he had suspicions about Koji Kashin's loyalty, yet still hid it fully from the other Inners, feigning complete trust to the point of admonishing Delta for not following Koji's way of executing the mission of retrieving Kawaki, and was able to easily trick him into revealing his desire to know Jigen's secrets.

Appearance
Jigen has long black hair tied in a ponyhawk style, a broad nose, eyes with large black irises that seem to blend with the pupil, and slightly pale skin. He bears a diamond-shaped Kāma mark on his chin, which when activated spreads across his chin, eyes, and body in vertical sunburst patterns. Below his left eye, he has a Roman numeral "Ⅳ" tattooed. In his first appearance he wears the black hooded cloak with maroon lining typical of Kara members, along with light-coloured capri pants and sandals, and a dark collar.

In later appearances, he dons a flowing white robe with black vertical lines on the sleeves and coattails and his personal crest on the back, loosely fastened at the waist with a tasseled belt, worn with matching red hair tie, hairband, collar, waistband, bracers, and pants, all decorated with red pearl studs, and simple sandals.

Abilities
Being an Inner of Kara, specifically as the organisation's leader, Jigen is a complete monster in terms of power and ability, well-regarded as by far the strongest of his organization. His very presence terrified Ino Yamanaka to the point of near-collapsing, fearfully describing his power as being incredibly sinister, and opting to have the Police Force stationed as backup for Naruto Uzumaki, well-regarded as the strongest ninja in history. Sasuke Uchiha, credited with being Naruto's peer in power, was greatly unnerved upon seeing a display of his power, chose to retreat rather than engage him. His true power, while still holding back, even proved able to pressure the unified teamwork of Naruto and Sasuke, showing that talk about his power wasn't exaggerated.

Jigen appears to be skillful in genjutsu, as he was able to use it as a means to communicate with many over a large distance at once. Jigen also has considerable senses, as he was easily able to sense the presence of Koji's toad that went unnoticed even to Naruto.

Ninjutsu
Jigen is able to shrink matter to microscopic levels and just as easily return it to normal so rapidly that it appears as if he conjures and vanishes objects from thin air, which he can perform with the most minute of gestures such as a mere wave of his hand or even just a flick of his fingers. In battle he utilizes this ability to launch microscopic black rods into the bodies of his foes, which then inflict catastrophic injuries and drain chakra from the victim when returned to their original size. He can also apply the ability to his own body, allowing him to disappear from sight and maneuver around the battlefield, as if teleporting, fast enough to catch the likes of Naruto and Sasuke off-guard. The limitations of this ability remain unknown, but Sasuke was able to track his movement even at a microscopic level thanks to the Sharingan. Outside of combat he also uses the technique for more mundane purposes, such as replacing home furnishings destroyed by Delta.

Apart from that, he can travel through dimensions with Space–Time Ninjutsu and levitate in the air. He can also perform those feats while in microscopic size to suspend himself, and teleport out of attacks he couldn't dodge. He appears to have access to his own dimension, a world with roiling purple storm clouds and desiccated white land, which he can use to strand his victims.

Physical Prowess
Jigen appears to be an extremely skilled melee-combatant, both with weapons and hand-to-hand combat, having personally brutally trained Kawaki into becoming a specialist in close-quarters combat. He has shown tremendous speed and strength, easily kicking Naruto away, impressing the Hokage with his reaction, and effortlessly caught a punch from Kawaki when he had Kāma activated with a casual grip, even effortlessly causing Kawaki visible pain by merely lightly twisting his arm. He is also highly durable, suffering no injuries from a kick to the jaw from Naruto in his Six Paths Sage Mode. While he had Kāma activated, Jigen was easily capable of handling Naruto in his Six Paths Sage Mode in physical combat and would have dealt a lethal blow had Sasuke not interfered in both times. He has also displayed remarkable proficiency with a large black rod to easily parry blows from Sasuke despite his skill in kenjutsu and said attacks being when he was either briefly knocked off or surprised.

Kāma
Jigen possesses a Kāma mark on his chin, which he can activate at will, causing it to spread across his entire body in nearly symmetrical sunburst patterns. He is able to pass a Kāma on to other individuals through the aid of science, albeit with a low success rate, more often resulting in death, and with Kawaki's coming from him, he can synchronize with the latter's Kāma to open a portal for him to teleport to his current location. Jigen is also skilled enough in its usage to have taught Kawaki proper usage of its power, with Kawaki noting he knows everything about Kāma.

With his Kāma activated, even without accessing it's transformed state, Jigen's power is already amplified to such levels that he was able to pressure both Naruto and Sasuke, wielding their Six Path Sage Mode and dōjutsu at full power respectively, at once for an extended period of time. His physical parameters are greatly enhanced, his strength being such that his blow pushed back Naruto noticeably despite him having properly blocked it, shocking the Hokage by the feat. His prowess with the absorption can absorb large quantities of chakra from tailed beast-like entities, and effortlessly neutralize Naruto's powerful Rasengan techniques, being unaffected even while in his microscopic state. However, he can not maneuver as efficiently while absorbing. He is also able to willingly activate Kāma's enhanced state, progressing it far enough to make a horn protrude from his left temple and wrap around the back of his skull, resembling a crown.

Ao Arc
Upon his organisation's vessel being lost, Jigen held a meeting with the other members of Kara to discuss the urgent situation, during which Koji was given the task of recovering Kawaki. As he dispelled the genjutsu, Jigen voiced that their group must recover the vessel at all costs.

Kawaki Arc
While eating a meal with Delta, she voiced her frustrations about the time it was taking to recover Kawaki, during which Jigen gave her permission to partake in the recovery of the vessel. Later, after Delta's decisive defeat by the Seventh Hokage, she reported that Koji was holding off on retrieving Kawaki to study Boruto Uzumaki after learning that the boy obtained his own Kāma. Smirking at this development, Jigen deduced that Momoshiki Ōtsutsuki was behind this. Later, Jigen went to an undisclosed location accessible only through space–time ninjutsu to see an immobilised beast. He spoke nonchalantly to it, hovering above and addressing it as Ten-Tails. The "Ten-Tails" tried to eat Jigen, but failed to do so as Jigen was out of reach. Jigen stated that it was too soon as he needed to complete the vessel. Jigen then used his Kāma to absorb more of its chakra and his physical form changed into an Ōtsutsuki who supposedly partnered with Kaguya Ōtsutsuki briefly. After absorbing the beast's chakra, Jigen intended to visit Boruto and Kawaki.

Using the connection between his and Kawaki's Kāma, Jigen teleported to Naruto Uzumaki's house instantly to bring back Kawaki. He noticed Koji's toad and watched suspiciously as it was incinerated by Koji before apologising to Naruto for his rude arrival. When Naruto rebuked his politeness with hostility and attacked him, Jigen easily subdued Naruto by pinning him down with rods and proceeded to easily restrain Kawaki and tried to reason with his wayward adopted son, noting how his prosthetic arm was merely a tracking device no different than Kāma, to him a disgusting object that he would fix when they returned to the base, and that the village was merely using Kawaki as a bait for Kara. Kawaki's Kāma activated and a horn grew out of it, surprising how much the mark advanced. Naruto then kicked him away and Jigen, seeing his foe won't back down, activated his Kāma to begin fighting the Seventh Hokage, intent on killing him for his interference. When Kawaki offered himself up in exchange for Naruto not being hurt, Jigen was willing to agree as long as he was cooperative but seeing Naruto's determination quickly changed his mind, seeing no compromise.

He then teleported Naruto to another dimension and attempted to strand him there but Sasuke arrived and kicked Jigen away. Jigen calmly identified Sasuke's identity based on his Rinnengan and critisized him for having a lousy timing that made them now pitted up against him, unfazed at facing the two without restraints. As he pressured the two legendary shinobi with his various techniques, including chakra absorption and black rod manifestation, the repeated performance ultimately let Sasuke deduce the true nature the latter. Jigen simply praised Sasuke for his analysis before deeming him the first one he should eliminate. As the two Konoha-nin began anticipating his patterns and pressured him into a retreat, Jigen praised his foes performance and thanked them for revealing his weaknesses to him before warning them in return that they would never have that same luck again as he revealed his true power and completely progressed his Kāma, protruding a horn from his left temple.

Trivia

 * Among other things, "Jigen" is the word for the.
 * Jigen's powers may draw inspiration from Issun-bōshi, a fairy tale hero from Japanese folklore who was only an inch tall. As a boy he went on an adventure to rescue a girl from an ogre, triumphing after being swallowed by it and using his sword — a needle — to attack it from within. He then claimed the ogre's magic hammer, Uchide no kozuchi, and used it to transform into a full-sized adult.