Ōga is a former Inner and scientist of Kara whose modified brain left her body failing and her will to live gone. Hunting for that lost desire, she abducts train passengers into an elaborate genjutsu of deadly survival games, hiding among them as the cheerful girl Yatsume.
In her real shape, Ōga is a young woman of ordinary height and fair skin, with large red eyes and long brown hair falling past her waist. As an Inner she bore the Roman numeral eight on her brow and wore grey robes. Under the Yatsume alias she reworks her look completely: her hair is bound into ox-horn shapes with tight braids and two thick antenna-like strands over her face, a white bandanna hides the Inner mark, and she dresses in a clipped-shut pale blue jacket over black shorts. She also fields an old-man guise, built from genjutsu and a puppet, that looks wrinkled and stooped with a gap-toothed grin, green pupil-less eyes, scraggly white hair and beard, brown cloth, and a winged red cap.
Eccentric and largely amoral, Ōga lost every drive after Jigen's attack wrecked part of her brain, including the plain wish to keep living. To rekindle it she is content to kidnap and steer crowds of strangers through her intricate schemes, priding herself on being more refined than other Inners because she keeps her victims in suspended animation rather than truly killing them. She reads life-and-death as something that always pits people against one another, yet Boruto's version of the instinct, which he frames as chasing dreams instead of clinging to survival, unsettles that view. His refusal to abandon anyone, herself included once her plot is exposed, leaves her blushing and stirs a dream she keeps to herself. Wearing the Yatsume face she is warm and neighbourly, catching Boruto before he falls and fretting when he risks himself for others, and in the end she frees every captive and slips away, leaving him a teasing letter and a promise to visit one day.
Amado rebuilt her as Kara's eighth Inner with Scientific Ninja Tools and a strand of Shibai Ōtsutsuki's DNA, and by reputation she ranked as monstrously powerful, though only her brain was truly enhanced and she never counted herself a fighter. She is still physically capable, holding the combined weight of Boruto and Shamo in one hand, scrambling down a ladder to snatch Boruto in mid-fall, and picking out the smell of blood on a captive. Chiefly she is a gifted puppeteer able to work a disguise from a distance, channels Lightning Release into her weapons, and wields Yin Release to project lifelike images of people and to run whole worlds of genjutsu. Keeping herself and her targets in suspended animation, she stitches together seamless, layered scenarios anchored to a scroll, and if anyone senses the illusion she simply folds a fresh one over it. Through this she staged her five trials, from a crumbling floor to a candle of lives to a crushing ceiling to a final counting game, testing how far people would go to survive.

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Ōga is a former Inner and scientist of Kara whose modified brain left her body failing and her will to live gone. She hunts for that lost desire by abducting train passengers into an elaborate genjutsu of deadly survival games.
Ōga lost every drive after Jigen's attack wrecked part of her brain, including the plain wish to keep living. To rekindle that desire, she kidnaps and steers crowds of strangers through her intricate survival trials.
Yatsume is the cheerful alias Ōga hides behind while running her genjutsu trials, reworking her look with ox-horn braided hair and a bandanna over her Inner mark. In this guise she comes across as warm and neighborly, unlike her true amoral self.
Amado rebuilt Ōga as Kara's eighth Inner using Scientific Ninja Tools and a strand of Shibai Ōtsutsuki's DNA. She is a gifted puppeteer who channels Lightning Release into her weapons and wields Yin Release to project lifelike genjutsu worlds.
Boruto's refusal to abandon anyone, including Ōga once her plot is exposed, leaves her shaken and stirs feelings she keeps to herself. In the end she frees every captive and slips away, leaving Boruto a teasing letter and a promise to visit one day.
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