Jiren first appeared on the cover of V Jump October 2017 issue. His first manga appearance was in Dragon Ball Super Chapter 30 printed in V Jump January 2018 issue. He made his first anime appearance during the eighty-fifth episode of Dragon Ball Super, seen meditating.
Jiren is a tall and muscular humanoid whose appearance is similar to the folkloric aliens known as the Greys. He has gray skin, big round black eyes with enlarged pupils, and nostrils in place of a full nose. He wears the uniform of the Pride Troopers, consisting of a red, spandex-like suit with black sections around the collar and legs, white gloves, and white boots.
Jiren appears to be serious during the Tournament of Power, mainly due to what's at stake. This was shown when he did not perform a pose like his teammates. Jiren also appears to be a quiet person and speaks only when he deems necessary. He is very brave and disciplined, remaining unfazed by practically anything. Even more, he is a focused and observant individual, constantly watching and studying his environment to better prepare for any new threat. He usually only acts when he feels he is needed, as he was inactive at the start of the tournament until seeing Kale go berserk and deciding to end her rampage. However, he is not beyond getting startled. When foes manage to catch him off guard or prove able to compete with him, he can become visibly rattled by it, as seen when Hit captured him in his Cage of Time or when Vegeta avoided his high-speed punches and hit him solidly.
Jiren's endless pursuit for power eventually improved his strength to the point where he became the strongest mortal warrior in Universe 11. His power outclasses fellow teammate Toppo, the second strongest mortal of Universe 11 and a God of Destruction candidate whose training has allowed him to essentially wield that power for additional might. Whis notes that Jiren's power may have surpassed the domain of the Gods of Destruction. Jiren's power is so immense that not even a God of Destruction can defeat him, making him one of the strongest warriors in the Dragon Ball multiverse. He is considered the Pride of Universe 11.