Jigen

Despite his ancient origins, Jigen's appearance managed to retain a youthful physique due to Isshiki Ōtsutsuki's influence. He was a fairly tall man of light complexion. He sported a shaved head, apart from a long mohawk of black hair tied in a long ponytail style reaching his lower-back, pronounced eye ridges void of brows, a broad nose, and large black eyes. Some time 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 was seemed to be completely black. He also wore black nail polish on his fingernails and toenails, five red earrings on the top of each ear, and an additional one at the bottom of each ear. In his first appearance, he wore the black hooded cloak with maroon lining typical of Kara members, along with dark capri pants and sandals, and a dark collar. In later appearances, he donned 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 tasselled belt, worn with matching red hair tie, collar, waistband, bracers, and pants, all decorated with red pearl studs and simple sandals.

Around the time that Kaguya Ōtsutsuki and Isshiki Ōtsutsuki arrived on Earth, Jigen was a novice monk. 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 gained full control over it. Afterwards, Isshiki embedded his Kāma in Jigen, but because Jigen's body wasn't powerful enough to sustain his chakra, Isshiki opted not to revive himself in Jigen, instead waiting until a more suitable vessel could be found. In time, Isshiki used Jigen's body to form a clandestine organisation to help achieve his goal, dubbed Kara. Eventually, Jigen found and purchased Kawaki from his abusive father for 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 Sanzu, with Kawaki being the only known success and thirteen dying outright. Despite promising him safety, Jigen put Kawaki through gruelling training to master the Kāma and would constantly berate him as only having value as a vessel, striking 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. In the anime, another Inner Ōga was enhanced to help Amado with his research on the human heart. When she attempted to study Jigen's, Isshiki considered it treason, and destroyed a portion of her brain before she escaped.