The Nine-Tails Chakra Mode is a form that Naruto gained after he separated and sealed Kurama from its chakra. He can access its chakra directly whenever he needs it without interacting with the beast at all. In doing so, he gains a chakra shroud that resembles the Sage of the Six Paths’ silhouette. The colour of his eyes changes from blue to orange when he is in this form and while the demon fox shroud is red and releases chakra as acidic bubbles, this form’s shroud is yellow and releases chakra as flickering flames.
With Kurama’s power under his control, Naruto’s strength is significantly increased to the point where he can push a fully formed Tailed Beast Ball through a multiple layered barrier. Killer B had trouble determining if Naruto’s speed was from the Body Flicker Technique, as all he saw was a “yellow flash” when Naruto attacked Kisame Hoshigaki. and in this form Naruto was able to surpass the speed of a fully charged A, who was the fastest shinobi in the world. Though he can still feel pain, this form’s chakra shroud gives Naruto a great amount of protection, regular swords are unable to pierce it, it protects him from extreme heat temperatures and extreme physical attacks do little damage.
The shroud’s chakra arms gives Naruto greater range of attacks as well as greater dexterity and manoeuvrability to his fighting style without the use of shadow clones and Naruto have used the chakra arms to create new Rasengan variants, such as the Spiralling Strife Spheres and the Spiralling Absorption Sphere. He is able to use the chakra arms to push himself off a platform and to extend his reach, where he would otherwise create a shadow clone to use as a landing point in mid-air. or to propel him through the air. The power of his techniques have become so great that, unless they already have some inherent durability, such as the Third Raikage, resurrected ninja have a hard time regenerating.
Like his predecessor, Mito Uzumaki, Naruto also gains Kurama’s ability to sense negative emotions, something that not even the best sensor-type ninja can do. and even inside a chakra isolation chamber within the Falls of Truth, Naruto was still capable of sensing intense negative emotions generated by Kinkaku. Due to having Kurama’s Yang chakra in this form, Wood Release techniques will react to the chakra’s life-giving properties and mature into full-grown trees within a matter of seconds, either by contact or close range.
However, using the Nine-Tails Chakra Mode was a huge risk. Naruto had to temporarily “shelve” his own chakra in order to use Kurama’s chakra, which allowed Kurama to automatically drain Naruto’s original chakra. If Kurama managed to take all of Naruto’s chakra, Naruto would die. In addition, the Eight-Tails advised him against the use of the Shadow Clone Technique, as Kurama would absorb every portion of Naruto’s chakra even faster for each clone he makes. Naruto also has to be careful about the amount of time he spends in this mode as the Eight-Tails claims that there is a limit to how much chakra Naruto managed to pull away from Kurama, implying that the untainted Nine-Tails’ chakra will eventually run out. Despite these risks however, once Naruto was on the battlefield, he deployed several of his shadow clones while in this mode to the different divisions to confront the enemy White Zetsu, indicating that the risks associated with this form are not instantaneous. Naruto was able to stay in this form for an entire night and most of the morning during the Fourth Shinobi World War, though the Eight-Tails notes that at some point Kurama had purposely stopped taking Naruto’s chakra.