Jiren's sheer ki was impervioius to base Goku's Kamehameha. In the anime, as Ultra Instinct Goku continued to overwhelm Full Power Jiren and defeat became apparent for him, Jiren's disdain for it (from the memories of his past trauma), let him awaken a much deeper level of his dormant potential and become the "In this state, Jiren was capable of going toe-to-toe with Ultra Instinct Goku, gaining enough power to bypass the instantaneous defense impulse of Ultra Instinct and even initially overwhelming Goku in raw power.In the manga, the exhausted Jiren attained this state when he began to be overwhelmed by Goku and Vegeta's combined assault at the end of the tournament, proclaiming he had no limits and allowing him to overcome their most powerful attack. Jiren, also referred to as "Jiren the Gray", is the main antagonist of the Universe Survival Saga in Dragon Ball Super. Finally, at the end of the movie, Goku compares Broly's power to that of Beerus. In the anime, during the Tournament of Power, Jiren scared In the manga, Jiren first faced Nigrissi, and was able able to knock him down with a single blow. Jiren's usual approach to fighting is to let his opponent come to him. Angry at Goku's words, Jiren says that such things are meaningless before him and the two once again collide in a fierce and mighty exchange of blows. While still not being unnecessarily and outwardly cruel, Jiren is capable of being rather condescending, openly considering Goku, Vegeta and Android 17 to be inferior to him and repeatedly suggesting they give up as he is clearly far too strong for them as well as mocking them when Android 17 and later Vegeta challenged Jiren alone. Frieza counterattacks by using his telekinesis and slams two large slabs of concrete into Jiren allowing Android 17 to tackle him and charges up a ki blast while restraining him. However, while he respects Toppo, who is second only to him in power and described as his best friend, enough despite his power vastly surpassing even that of his leader that he willingly listens to him and follows his orders, he is not above being direct and blunt even to his friend, as he sternly told Toppo to step aside so that he could handle Maji Kayo, who was restraining Dyspo.

This is one of the major reasons why we won’t know if Jiren has gone full power in any of the fights that we witnessed.During the tournament of power, Whis confirms that the rumor about the existence of a mortal who is stronger than the gods in a certain universe is true.
Jiren wears the uniform of the Pride Troopers, consisting of a red, spandex suit with black sections around the collar and legs, white gloves, and white boots.

When Top tells Jiren to participate in the Tournament of Power, he initially refuses to enter - as while it is his duty to protect Universe 11, he will not cause the destruction of other universes to save his own. Even more, once he was the remaining fighter of his universe, he became rather condescending, openly calling his remaining foes insects. Android 17 was the ultimate winner of the Tournament of Power, but if he had to fight Jiren alone, things certainly wouldn't have turned out … In the anime, when Jiren was a child, he returned to his house and found that his parents were killed by a In the manga, Jiren was encouraged to join the Pride Troopers by his master Gicchin, who lost his life to a monster some time afterwards. In credit to his claim, his body would continuously produce a powerful barrier in this state, to which Dyspo notes that no one is worthy of fighting Jiren if they cannot even get through the barrier. Universe 11 bask in their oncoming victory only when Top notices that in the midst of the hail of fire, there are shockwaves being emitted from within and the same shockwaves that emerge whenever Jiren and Goku's fists collide; this means that Goku's state has switched from defensive to offensive. This in turn gives Jiren the boost to stand and charge up before releasing a tremendous wave of power that forces both Frieza and Android 17 to form a barrier together to protect themselves but Jiren's energy is so strong that it causes the barrier to crack threatening to eliminate them in the process.
Once engaging in battle, his attack methods are very basic, but solid and efficient, quickly decimating any foe with the sheer force of his attacks. Easily. However, after Goku awakened his hidden power again, Jiren returned to the side of his colleagues in order to observe Universe 7 defeat the other Universes. As Goku's drive ultimately proved greater than Jiren's and technically defeated him, Jiren composed himself enough to accept defeat, showing he has an honorable side. However, Vegeta noted that Jiren was showing much less strength than against Goku. Once reaching this hostile state, he becomes essentially unreachable with words. "Strength is everything. Jiren yells that the same trick he used before will not work twice but Android 17 forms a barrier around them to contain the blast before detonating it on Jiren. Jiren proclaims that these meaningless things like friendship, trust, and family can easily be erased. Despite how he treated the Pride Troopers with little respect after they had fallen, Toppo's speech caused Jiren to stand up again to try to live up to the hopes of his allies. Beerus at full power, using ultra instinct would be more powerful than Goku’s level from when he was facing off with Jiren. With his power being greater than that of a Hakaishin, Jiren is very proud of his strength. He is also tremendously fast, more so that even Dyspo in his Super Maximum Light Speed Mode who overwhelm the likes of Golden Frieza, is nowhere near Jiren's speed. He then proceeded to charge through Maji-Kayo and Pancéa, easily knocking them aside though not knocking Maji-Kayo out.

It took a full power Kamehameha to finally render him unable to battle.