[Updated] Nagato's abilities
As the leader of Akatsuki, and one of the two sides of the Amegakure civil war, Nagato was an extraordinarily powerful shinobi, and recognised as the most powerful member of Akatsuki. His partner, Konan, had stated that he had never lost a single battle, and that he is "unbeatable".
even Tobi noted that Nagato was invincible while praising Jiraiya.
Nagato even killed Jiraiya with relative ease, after revealing all six of his bodies. In praising his former teacher, Nagato attributes his ability to defeat Jiraiya to the secret of his Six Paths of Pain and the fact that he underestimated Jiraiya's level of genjutsu usage, stating he would not have won if Jiraiya had uncovered the secret behind his Six Paths of Pain technique. Zetsu expressed shock when Nagato was defeated by Naruto, stating he never thought Nagato would ever lose even in a weakened state.
After being reincarnated by Kabuto Yakushi, he was able to easily overwhelm both Naruto Uzumaki and Killer B, despite Naruto being in his Nine-Tails Chakra Mode and Killer B having perfect synchronism with his tailed beast. He would have killed them both had it not been for the intervention of Itachi Uchiha while Kabuto was preoccupied with them. It took the combined efforts of Naruto, B, and Itachi to successfully defeat Nagato in the state of control Kabuto had him under. As a member of the Uzumaki clan, he also possessed the potential for incredible longevity. It has been noted at several points in time that Nagato possessed an unusually large amount of exceptionally strong chakra, to the point of after he decimated entire Konoha and fought Naruto Uzumaki, he still had enough strength to revive all of the people he had killed in Konoha.
Nagato's legs were greatly damaged in a battle against Hanzō. As a result, even though he can stand up by himself, he can't move as quickly. To make up for this while alive, Nagato used the Six Paths of Pain to fight for him while he stayed in one place in a mechanical walker. When he was reincarnated by Kabuto, he used various summons to move around and to keep himself out of range of the opponents' attacks.
Nagato's incredible power stemmed mainly from his kekkei genkai, the legendary Rinnegan. This was originally possessed by the Sage of the Six Paths, the world's first ninja, and the founder of modern ninjutsu. Even as a child, Jiraiya noted that Nagato had mastered every ninjutsu he taught him. He mastered all five basic nature transformations, something that was completely unprecedented. Nagato was also well versed in all the mainstream ninjutsu, and at age ten, he mastered them all.
According to Ibiki, the Rinnegan allows Nagato to use any technique he wishes. Nagato was shown to be adept at the use of genjutsu. He used it to install mental barriers and traps in his minions' minds to prevent others from accessing secret information.
Similar to the other great dōjutsu, the Rinnegan bestows him with enhanced vision, allowing him to see the chakra of barrier techniques around the perimeter of his location, and the chakra gathered at a shinobi's feet.
While acting through the Deva Path, Nagato has displayed a wide range of techniques. Nagato was responsible for the meeting of all the Akatsuki members by using a technique that allowed him to pick up their thought waves and broadcast in the form of an astral projection to a specific place where the jinchūriki was being held. During the time when a tailed beast was being extracted from its host, Nagato would set up various ways to stall and prevent the rescuers from getting to them in time to stop the extraction. Among these various techniques was the Five-Seal Barrier, which prevented anyone from destroying anything that was within its boundaries without simultaneously removing the five seals — an effective method to split enemy forces. Nagato also added another safety procedure which activated once the seals had been removed, creating a copy that perfectly resembled the person who removed the seal, imitating their battle skills as well. Another technique that Nagato used to delay and stop pursuers from interrupting the extraction was the Shapeshifting Technique which allows Nagato to allocate a portion of an individual's chakra and transfers it into a living human sacrifice, allowing the original to fight via an elaborate "copy". This allowed the sacrifices to attain whatever kekkei genkai, techniques and weapons the real person would possess. However once, the allocated chakra is finished along with that of the sacrifice's own, the technique is cancelled and the copy is killed.
Nagato was able to use the Summoning Technique, allowing him to summon Konan, his other Paths and the Demonic Statue of the Outer Path. He could also use the Amplification Summoning Technique, which allowed him to summon an animal with a specific condition. Furthermore, when guarding Amegakure Nagato was able to use the Rain Tiger at Will Technique to make it rain, this rain was infused with his chakra and as such served as a large-scale sensory technique for him in his village. According to Itachi, Nagato's real body has the ability to sense chakra.
Nagato's most powerful and most used technique was the Six Paths of Pain (ペイン六道, Pein Rikudō). This technique allowed Nagato to control six separate bodies as though they were his own. Each of these bodies were reanimated corpses that were both kept mobile by and made use of Nagato's chakra. By using these six bodies for combat rather than himself, Nagato avoids the unlikely risk of being killed in battle by a stronger opponent as well as having six different fields of vision, making it virtually impossible to attack any of the bodies without being seen as well as compensating for his lack of mobility. While controlling them, Nagato used the alias "Pain", yet still regarded them as separate entities from himself.
The Paths can't feel physical pain since they are just controlled corpses, as Ibiki Morino discovered when he tried torturing the second Animal Path.
In order to use the technique, Nagato remained in a machine that moved with six relatively small mechanical legs and used several large chakra rods on his back to transmit chakra. From his location, the chakra was picked up by the numerous receivers, modelled as body piercings on each body. To control them, Nagato had to be close by, and ideally at the highest possible point, so he could have the best possible range.
Based on the six Buddhist Paths of Reincarnation, each body was named after one of the different "Paths": Deva, Asura, Human, Animal, Preta, and Naraka. The only common feature shared by these bodies was their bright orange hair and their Rinnegan. Each also had a vast number of body and facial piercings of various shapes, sizes, and patterns. Each body seemed to serve a specific purpose in battle, such as summoning, repairing, and defensive capability. He himself was regarded as the seventh Pain, the "Outer Path", with control over the forces of life and death. Fukasaku stated, the best way of fighting Pain is to take out the Paths one at a time as they were most formidable when fighting together in combos.
As stated by Konan, Nagato is able to use all the powers of the Paths himself, as they are all powers of the Rinnegan. This is later demonstrated after his reincarnated by Kabuto Yakushi. With all the Six Paths abilities in one body, Nagato proved to be a formidable opponent easily overwhelming Naruto and Killer B at the same time. He was capable of using several of the Paths techniques simultaneously. Naruto noted that since he was using his real body, the strength and speed of his techniques were on a much higher level.