BACK STORY
The Nine Tail Fox attacked the Leaf village destroying much of the village and taking many lives. The leader of the village, the Fourth Hokage sacrificed his life to seal the Nine-Tails into a newborn, Naruto Uzumaki. Orphaned by the attack, Naruto was shunned by the villagers, who out of fear and anger, viewed him as the Nine-Tails itself. Though the Third Hokage outlawed speaking about anything related to the Nine-Tails, children taking their cues from their parents, inherited the same animosity towards Naruto. In his thirst to be acknowledged, Naruto vowed he would one day become the greatest Hokage.
Years of isolation and scorn from the villagers made Naruto thirst for acknowledgement. He would pull pranks around the village just to get a response from anyone and his desire to be Hokage was in hopes of being someone that mattered. Naruto's time at the Falls of Truth revealed that a part of him hated the villagers for treating him as a pariah, only to turn to him after he saved them during Pain's assault on Konoha. This hatred allowed the Nine-Tails to manipulate Naruto in his rage, causing him to go on a rampage several times until Naruto confronted the problem and learned to let it go. As he grew in his career as a ninja, his goal to be Hokage went from a desire for acknowledgement to a desire to help and protect the people close to him, which Tobi attributed to theWill of Fire. Naruto developed his nindō of never going back on his word, putting himself through any lengths required to keeping his promise. This was especially shown in Naruto's promise to Sakura to bring Sasuke back after his defection from Konoha, despite Sakura herself having grown to see this as impossible due to Sasuke becoming a dangerous international criminal later on as well as the pain it was causing him.
Sage mode
In Sage Mode, Naruto's overall physical parameters are dramatically enhanced, being able to survive falls from great heights unharmed, easily throw entities much larger than himself, and push through a large group of shinobi. His speed is also increased to the point where he could intercept a charging Asura Path and destroy it before it could attack Tsunade, as well as react and counter the Third Raikage's Hell Stab. He is also able to utilise Frog Kata, a taijutsu style that uses the natural energy to enhance the range and the potency of one's attacks. Naruto noted that he can also access Sage Mode at a faster rate when combined with his Tailed Beast Mode. In Naruto's final fight with Sasuke, Kurama proved able to gather natural energy for Naruto's usage while in battle, effectively bypassing his Sage Mode's weakness
nine tail mode
Combined with his already massive chakra reserves, being the jinchūriki of Kurama's Yang half gives Naruto a reserve a hundred times greater than Kakashi's. Due to his Uzumaki lineage and being Kurama's jinchūriki his entire life, Naruto's chakra was more effectively mixed with the fox's. Because of this, Naruto can perform very chakra-taxing techniques in quick succession without feeling fatigued. When tapping into Kurama's chakra, Naruto gains enhanced speed, strength and healing. Later, Naruto gained some of the other tailed beasts' chakra. This combined with both Yin and Yang-Kurama sealed into him and restored as one being increased Naruto's chakra strength and reserves even more.
At first, Naruto could only access Kurama's power when he was enraged or his life was in danger, but after training, he learned how to access the chakra by consciously requesting the fox for help. However, while Naruto was able to utilise Version 1 transformations, he only had the briefest of control of his own actions. If he fell deeper into a rage, Naruto could slip into Version 2, losing himself to Kurama's negative influence and going berserk, requiring outside help to suppress the fox's chakra. Because of these drawbacks, Naruto wouldn't make use of Kurama's chakra until he was given the means of controlling the chakra completely.
At first, Naruto could only access Kurama's power when he was enraged or his life was in danger, but after training, he learned how to access the chakra by consciously requesting the fox for help. However, while Naruto was able to utilise Version 1 transformations, he only had the briefest of control of his own actions. If he fell deeper into a rage, Naruto could slip into Version 2, losing himself to Kurama's negative influence and going berserk, requiring outside help to suppress the fox's chakra. Because of these drawbacks, Naruto wouldn't make use of Kurama's chakra until he was given the means of controlling the chakra completely.
Eventually realising its own respect for Naruto after all he had endured in his life and the type of person he has become, Kurama decides to accept his friendship. With this new unity, Kurama freely gives Naruto its chakra and access to Tailed Beast Mode, which was yet another increase in speed, strength, durability, and the ability to create Tailed Beast Balls. Unlike other Tailed Beast Modes, Naruto's form is transparent, allowing others to enter the chakra shroud and grant them some of Naruto's power while inside of it. He can still access his previous forms, as shown when he entered Version 1 to deflect Amaterasu. He can also use Kurama's chakra to revatilise the life forces of others. Should the need arise, Kurama can transfer to Naruto chakra that is limited and usable to him alone, even if the chakra was instead absorbed.