Kurama

Kurama takes the shape of a red-orange kitsune, black fur running from its crimson eyes toward the ears, trailed by nine long, sweeping tails. Oddly for a beast, its upper body echoes a human's, right down to clawed hands with opposable thumbs. In its earliest days under Hagoromo it was far smaller and softer of feature, closer to a fox cub, before growing to rival the Hokage Rock in scale and dwarfing even the great toad Gamabunta. When Minato split its chakra, the fox became two shrunken halves, the Yang portion keeping the original hue and the Yin portion turning darker. Wrapping itself in the Nine-Tails Chakra Mode turns its whole body a translucent gold laced with black markings, and drawing on Naruto's Six Paths power swells its avatar to colossal proportions. Reborn after its death, it came back as a cub no larger than a big dog, its tails still remarkably long.

Sharp-tongued and shrewd, Kurama carries itself with towering pride, long convinced it was the strongest of its kind on the logic that it held the most tails, a boast that earned it nothing but scorn from its siblings. Its manner of speech tends toward the harsh, yet beneath that edge sits a genuinely supportive streak, quick with concern or a word of encouragement for those it trusts. Centuries of being feared as a calamity and passed around as a tool of war bred a deep hatred of humans; the fox once branded itself the living embodiment of that hatred and schemed to break loose from whoever sealed it. Naruto changed all of that. Met with respect in place of fear, Kurama slowly let go of its grudge, came to call Naruto a true friend, and even hid the lethal price of Baryon Mode so the boy could not argue it out of the sacrifice. It grew fond of Naruto's family too, watching over them almost as a parent would, and after being reborn within Himawari it took on a patient, mentoring air. For all its menace, the fox has a comic side, needling Naruto and bickering with him like an exasperated elder.

Regarded as the mightiest of all nine, Kurama commands vast chakra beyond any of its brethren, enough to power the whole Allied Shinobi Forces and to be felt from countries away. Even at half strength it could overwhelm five other tailed beasts at once, and once made whole again its absolute peak, reached through Baryon Mode, proved enough to overpower Isshiki Otsutsuki. Its raw force is the stuff of legend, reputedly able to raise tsunamis and level whole mountains with a single flick of its tail. As a tailed beast it forms the Tailed Beast Ball, firing it as a beam or a rapid barrage, and can supercharge one many times its size even on the barest wisps of chakra. Its roars alone can scatter a massive Rasengan or flatten city blocks. Beyond brute power, the fox is a keen sensor, reading chakra at great range and uniquely able to detect negative emotions, and it can gather natural energy to feed Naruto senjutsu chakra. It heals wounds in itself and others within moments and is effectively immortal, reviving in a younger form each time it dies. Cunning completes the picture: Kurama devises strategies in the thick of battle, leads its allies with a cool head, and even reasons about the nuclear fusion that fuels Baryon Mode.