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Jigen (ジゲン, Jigen) was a novice monk that became the vessel for Isshiki Ōtsutsuki, and eventually had his body completely taken over by Isshiki invading it. Due to Isshiki leaving his body, and having little to no chakra at all, he passed away.
Around the time that Kaguya Ōtsutsuki and Isshiki Ōtsutsuki arrived on Earth. Jigen was a novice monk and after Kaguya left him for dead, Isshiki assaulted Jigen, during which he shrunk himself and entered the monk's ear in order to survive. Through having his nutrients absorbed from within his body, Isshiki began gaining control over Jigen's body, and eventually lost full control of it. Afterward, Isshiki embedded his Kāma in Jigen, but because his body wasn't powerful enough to sustain him. Isshiki also opted not to revive himself in him, instead of waiting until a more suitable vessel could be found. In time, Isshiki used Jigen's body to form a clandestine organization to help achieve his goal, dubbed Kara. Eventually, Jigen found and purchased Kawaki from his abusive father with a large sum of money, to use as a potential new vessel. After taking custody of the boy, Jigen introduced himself as his new father and reassured him. He would later attempt to transfer Kāma to Kawaki and fourteen other boys in an experiment conducted with the help of the Kara scientist Amado, with Kawaki being the only known success and thirteen dying outright. Despite promising him safety, Jigen put Kawaki through grueling training to master the Kāma and would constantly berate him as only having value as a vessel. He would also strike the boy whenever he questioned him. As with the rest of Kara, Jigen also had his body extensively modified by Amado's Scientific Ninja Tools. Isshiki plotted to feed Jigen, along with himself still living within the monk's body, to the Ten-Tails, in order to fulfill the requirements to have it bloom into a God Tree, despite the resultant Chakra Fruit will be of lower quality due to the sacrifice's poor health and strength.
Despite his ancient origins, Jigen's appearance managed to retain a youthful physique due to the influence of Isshiki Ōtsutsuki. He is a fairly tall man of light complexion. He sports a shaved head, apart from a long mohawk of black hair tied in a long ponytail style reaching his lower-back, pronounce eye ridges void of brows, a broad nose, and large black eyes. Sometime after Isshiki took control of him, he gained a diamond-shaped Kāma mark on his chin and a Roman numeral "Ⅳ" tattooed below his left eye. The area where his stomach is seems to be completely black. He also wears five red earrings on the top of each ear and an additional one at the bottom of each ear.
In his first appearance, he wears the black hooded cloak with maroon lining typical of Kara members, along with light-colored 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 to his waist was a tasseled belt, worn with matching red hair tie, collar, waistband, bracers, and pants, all decorated with red pearl studs, and simple sandals.
As the leader of Kara, Jigen's body is modified with Scientific Ninja Tools and is a complete monster in terms of power and ability. The strongest of his organisation, his might far surpasses even the other Inners. As the current vessel of Isshiki Ōtsutsuki, much of his power comes from the exceedingly powerful Celestial Being who resides within his body. From just sensing his power, Ino Yamanaka opted that the Seventh Hokage confronts him with aid. Even without accessing his full power, he could still fight and pressure both Naruto and Sasuke Uchiha, the two strongest shinobi in history simultaneously. However, only when Isshiki decided to draw out his full power into Jigen's body was he able to defeat Naruto and Sasuke at all as prior. The two shinobi took Jigen to his limits, whereupon accessing full power was Jigen able to decisively defeat both of them, sealing the former while nearly killing the latter. The fight severely weakened Jigen to the point he was forced to withdraw his attempt to retrieve Kawaki and engage in a two-day recuperation process.
As Isshiki's vessel, his body is able to channel the various abilities of the Celestial Being. He can produce black rods capable of draining chakra from the victim and can also shrink matter to microscopic levels and just as easily return it to normal so rapidly. He can also manifest various stored objects from a pocket dimension, 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. He utilizes these abilities to launch the black rods at microscopic size into the bodies of his foes while leaving them completely unaware, before returning them to their original size to instantly inflict catastrophic injuries. He can also enlarge them whenever necessary to counter armed blows from enemies. 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. Once activating Kāma's full power, Jigen became able to use these abilities at an even greater level, able to spontaneously summon large black rods instantly to incapacitate Naruto and Sasuke and even form them from his neck to block Sasuke's sword attack
Jigen is 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 catching a punch from Kawaki when he had Kāma activated, 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. Upon accessing Kāma's enhanced state, Jigen effortlessly defeated Naruto and overpowered his shadow clones within a matter of moments. He has also displayed remarkable proficiency with a large black rod to easily parry blows from Sasuke, despite his skill in kenjutsu. Even while severely weakened from his battle with Naruto and Sasuke, he remained fully capable of matching Koji Kashin in hand-to-hand combat.
As Isshiki's vessel, Jigen wields tremendously powerful chakra, compared to Naruto in his Six Paths Sage Mode form by Kawaki. When he activated Kāma's transformed state, his chakra was such that it intimidated Sasuke into fleeing and later on unnerved both him and Naruto. Even without Kāma, his sinister chakra was already strong enough to terrify Ino Yamanaka to the point of near-collapse, whereas she only felt a slight reaction upon sensing Delta's chakra. His reserves are shown to be able to maintain prolonged usage of his Kāma without issue against the likes of Naruto and Sasuke simultaneously. Although using its full power for such a long period could still weaken him considerably, draining him of almost all of his chakra and taking two days to return to full power. Despite this weakened state, he retained enough chakra to battle Koji, using several of his techniques, with seemingly little drain.
Jigen possesses a Kāma mark on his chin, caused various augmentations to him including tremendously enhanced longevity, having remained in his physical prime for over 1,000 years. It can be activated 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. Also with Kawaki's coming from him, he can synchronize with the latter's Kāma to open a portal 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, the mark spreads across his chin, eyes, and body in vertical sunburst patterns. In this state. Jigen's power is already amplified to such levels that he was able to pressure both Naruto and Sasuke 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, resilient enough to be completely uninjured and instantly recover from being harshly kicked to the jaw by Sasuke. His prowess with the absorption can absorb large quantities of chakra from tailed beast-like entities, and effortlessly neutralize Naruto's powerful Rasengan techniques and Sasuke's Amaterasu, being unaffected even while in his microscopic state. However, he can not manoeuvre as efficiently while absorbing.
When accessing the full power of the Kāma, his enhanced state progresses it far enough to make a horn protrude from his left temple and wrap around the back of his skull, resembling a crown. In this state, Jigen gains an even more tremendous boost in power, able to easily defeat both Naruto and Sasuke. He was so fast and strong he could easily dodge Sasuke's Complete Body Susanoo's sword slash and then penetrate it with a single kick to send Sasuke flying as well as punch Naruto out of his Tailed Beast Mode and causing him to draw blood with a single attack. Along with that, he was able to make Naruto and Sasuke bleed severely with just a few punches, even reverting Naruto back to his base form.