As formidable as Naruto's chakra is alone, his reserves are greatly augmented by the tailed beast within him. Kakashi estimates Naruto's reserves are at least a hundred times greater than the jōnin without suppressing Kurama's chakra.[72] Naruto's chakra has been mixing with Kurama's since the day he was born, amplifying his already large reserves. According to Kurama, because Naruto spent his entire life as a jinchūriki and has his mother's special chakra form, Naruto's chakra has more effectively moulded with the tailed beast's own.[78] Due to this symbiosis, Naruto can perform many chakra-taxing jutsu and in a very rapid sequence. Despite this, Naruto spent most of his life not even aware of the demon fox's existence within him. Naruto's journey to access and control Kurama's power (and later befriend the tailed beast) is a long and arduous one. Having been its jinchūriki for his entire life, Naruto has always benefited from its presence. After learning of Kurama's presence, Naruto begins tapping into the fox's enormous chakra reserves, supplementing his own and increasing his strength and speed in the process. It also augments Naruto's healing power, able to regenerate lost flesh within seconds with no lingering signs. But Naruto does not, in fact, consciously access Kurama's power on the first few occasions. Rather, Kurama intervenes when Naruto's life is in danger or it takes advantage of Naruto's rage to exert some of its influence. Jiraiya teaches Naruto how to communicate with Kurama, enabling Naruto to thereafter request a donation of its strength. His ability to utilise it and the amount he can access grows during Part I, culminating in his ability to enter a single-tailed version 1 state, which improves Naruto's defences and allows him to manifest chakra arms that increase his range.
Jiraiya helps Naruto improve his control of Kurama's power during their two-and-a-half years together. Naruto is able to reach a three-tailed version 1 form, which incrementally boosts his speed and strength. Although Naruto becomes more headstrong, even violent, when using version 1 cloaks, he remains in control. Satisfied with these results, Jiraiya loosens the seal that keeps Kurama sealed inside Naruto in the hopes it will give Naruto increased access to its chakra. This inadvertently triggers a version 2 state; Naruto's capabilities grow to exponential heights in version 2, but Naruto no longer remains in control of his senses, causing him to attack anything in sight. Jiraiya is nearly killed in their first experiment and Naruto remembers nothing about it afterwards. From that point further, Jiraiya encourages Naruto to be cautious in his use of Kurama's power and, upon returning him to Konoha, Jiraiya quietly advises others about how to prevent Naruto from losing control.[79]
Because he was never told about his first version 2 experience, Jiraiya's warnings do not make an impression on Naruto. Added to the increasing danger he and his friends face and the frustrations that come with them, Naruto eventually enters a version 2 form a second time. Although he is able to use it to overpower Orochimaru, he attacks Sakura in the process. Yamato, having been specifically teamed with Naruto to suppress Kurama if needed, intervenes in time to save her.[80] Yamato tells Naruto afterwards what happened. Upset that he could be a danger to those he cares for, Naruto stops relying on Kurama and looks for new ways to get stronger. He succeeds for a time, but once again succumbs to rage after witnessing Pain nearly kill Hinata Hyūga and enters another version 2 form.
Naruto in Nine-Tails Chakra Mode. Naruto's desperation for power in order to defeat Pain almost makes him release Kurama, causing him to realise that avoidance is not the solution. He instead decides to control the fox's power, and seeks guidance from Killer B, the jinchūriki of the Eight-Tails. With B's help he is able to conquer Kurama and gain free access to a portion of its strength, focusing its power into a Nine-Tails Chakra Mode. In this form, his body is shrouded in yellow chakra, upon which his seal is clearly visible. He also gains a necklace of magatama around his neck. Finally his hair spikes up, with the two endmost locks resembling horns. Nine-Tails Chakra Mode increases his strength, speed, and defences beyond what they were in Version 1 and 2, he becomes more dexterous with chakra arms, and he can sense negative emotions, a method of detection even sensor-type ninja can't do.[81] His speed in particular surpasses A's, who was the fastest shinobi in the world since Minato Namikaze died.[82] Nine-Tails Chakra Mode becomes instrumental to turning the tide of the Fourth Shinobi World War, letting him defeat the hordes of reincarnated shinobi.
Naruto in Tailed Beast Mode. Conquering Kurama is not the same as cooperating with it, and Naruto must still exercise caution when initially using Nine-Tails Chakra Mode. Having seen what Naruto has gone through during his life and the type of person he has become, Kurama decides to stop opposing Naruto and accepts Naruto's offers of friendship. Kurama freely gives Naruto as much of its chakra as it can, enabling him to enter Tailed Beast Mode. In this form, the chakra shroud splits down the middle of Naruto's body and opens up into a cloak that has a tattered appearance. The previously smaller 'horns' grow out larger, and his whisker marks become thicker. Underneath the 'coat', the magatama are still visible and he gains a new set around the 'collar' of the coat. Underneath this his seal changes once again opening out into circles instead of swirls. He also gains seals on his hands and feet. The cloak also has nine, tail-like appendages formed from the cloak and flowing from it with lines running down the middle of each. In Tailed Beast Mode, Naruto can fully manifest Kurama's form, in doing so unleashing Kurama's full might and gaining the ability to fire Tailed Beast Balls.[83] His speed, strength, and durability also increase by impressive amounts, to the point where he could deflect five Tailed Beast Balls at the exact same time and send them flying kilometres away, and even pin and damage a senjutsu-enhanced complete Susanoo from Madara Uchiha with a single tail.[84][85] He could hold his own against three tailed beasts in battle and equal the combined power of the five with a single Tailed Beast Ball in a clash.[86][87] Naruto is even able to meld his and Kurama's chakra together so that he can transfer it to others, giving them version 1-like cloaks that keep them safe and amplify their power.
Naruto forming a lava Rasenshuriken with Son Gokū's chakra. Since befriending the tailed beasts, Naruto has gained a portion of each of their chakra, each of which is able to manifest itself inside Naruto's subconscious. The possession of these chakra allowed him to pull out the tailed beasts trapped inside the Ten-Tails' jinchūriki. After Naruto obtained the chakra of all nine tailed beasts, he later gained the ability to borrow their power, demonstrated when he used Son Gokū's chakra to use the Sage Art: Lava Release Rasenshuriken.[88] Similar, when accessing Shukaku's power, Naruto can use the Magnet Release to create the Sage Art: Magnet Release Rasengan. The tailed beasts are also able to aid Naruto in forming such complex techniques with a single hand.
Jiraiya helps Naruto improve his control of Kurama's power during their two-and-a-half years together. Naruto is able to reach a three-tailed version 1 form, which incrementally boosts his speed and strength. Although Naruto becomes more headstrong, even violent, when using version 1 cloaks, he remains in control. Satisfied with these results, Jiraiya loosens the seal that keeps Kurama sealed inside Naruto in the hopes it will give Naruto increased access to its chakra. This inadvertently triggers a version 2 state; Naruto's capabilities grow to exponential heights in version 2, but Naruto no longer remains in control of his senses, causing him to attack anything in sight. Jiraiya is nearly killed in their first experiment and Naruto remembers nothing about it afterwards. From that point further, Jiraiya encourages Naruto to be cautious in his use of Kurama's power and, upon returning him to Konoha, Jiraiya quietly advises others about how to prevent Naruto from losing control.[79]
Because he was never told about his first version 2 experience, Jiraiya's warnings do not make an impression on Naruto. Added to the increasing danger he and his friends face and the frustrations that come with them, Naruto eventually enters a version 2 form a second time. Although he is able to use it to overpower Orochimaru, he attacks Sakura in the process. Yamato, having been specifically teamed with Naruto to suppress Kurama if needed, intervenes in time to save her.[80] Yamato tells Naruto afterwards what happened. Upset that he could be a danger to those he cares for, Naruto stops relying on Kurama and looks for new ways to get stronger. He succeeds for a time, but once again succumbs to rage after witnessing Pain nearly kill Hinata Hyūga and enters another version 2 form.
Naruto in Nine-Tails Chakra Mode. Naruto's desperation for power in order to defeat Pain almost makes him release Kurama, causing him to realise that avoidance is not the solution. He instead decides to control the fox's power, and seeks guidance from Killer B, the jinchūriki of the Eight-Tails. With B's help he is able to conquer Kurama and gain free access to a portion of its strength, focusing its power into a Nine-Tails Chakra Mode. In this form, his body is shrouded in yellow chakra, upon which his seal is clearly visible. He also gains a necklace of magatama around his neck. Finally his hair spikes up, with the two endmost locks resembling horns. Nine-Tails Chakra Mode increases his strength, speed, and defences beyond what they were in Version 1 and 2, he becomes more dexterous with chakra arms, and he can sense negative emotions, a method of detection even sensor-type ninja can't do.[81] His speed in particular surpasses A's, who was the fastest shinobi in the world since Minato Namikaze died.[82] Nine-Tails Chakra Mode becomes instrumental to turning the tide of the Fourth Shinobi World War, letting him defeat the hordes of reincarnated shinobi.
Naruto in Tailed Beast Mode. Conquering Kurama is not the same as cooperating with it, and Naruto must still exercise caution when initially using Nine-Tails Chakra Mode. Having seen what Naruto has gone through during his life and the type of person he has become, Kurama decides to stop opposing Naruto and accepts Naruto's offers of friendship. Kurama freely gives Naruto as much of its chakra as it can, enabling him to enter Tailed Beast Mode. In this form, the chakra shroud splits down the middle of Naruto's body and opens up into a cloak that has a tattered appearance. The previously smaller 'horns' grow out larger, and his whisker marks become thicker. Underneath the 'coat', the magatama are still visible and he gains a new set around the 'collar' of the coat. Underneath this his seal changes once again opening out into circles instead of swirls. He also gains seals on his hands and feet. The cloak also has nine, tail-like appendages formed from the cloak and flowing from it with lines running down the middle of each. In Tailed Beast Mode, Naruto can fully manifest Kurama's form, in doing so unleashing Kurama's full might and gaining the ability to fire Tailed Beast Balls.[83] His speed, strength, and durability also increase by impressive amounts, to the point where he could deflect five Tailed Beast Balls at the exact same time and send them flying kilometres away, and even pin and damage a senjutsu-enhanced complete Susanoo from Madara Uchiha with a single tail.[84][85] He could hold his own against three tailed beasts in battle and equal the combined power of the five with a single Tailed Beast Ball in a clash.[86][87] Naruto is even able to meld his and Kurama's chakra together so that he can transfer it to others, giving them version 1-like cloaks that keep them safe and amplify their power.
Naruto forming a lava Rasenshuriken with Son Gokū's chakra. Since befriending the tailed beasts, Naruto has gained a portion of each of their chakra, each of which is able to manifest itself inside Naruto's subconscious. The possession of these chakra allowed him to pull out the tailed beasts trapped inside the Ten-Tails' jinchūriki. After Naruto obtained the chakra of all nine tailed beasts, he later gained the ability to borrow their power, demonstrated when he used Son Gokū's chakra to use the Sage Art: Lava Release Rasenshuriken.[88] Similar, when accessing Shukaku's power, Naruto can use the Magnet Release to create the Sage Art: Magnet Release Rasengan. The tailed beasts are also able to aid Naruto in forming such complex techniques with a single hand.