>>104915703Jiren is just Space Younger Toguro, a man motivated by the death of his mentor and friends to become stronger. He's one dimensional because Toei missed an opportunity to have the Great Saiyaman talk him out of his mentality. They couldn't even spring for a Yougner Toguro vs. Urameshi tier match.
It doesn't help that Goku pretty much kick started the entire universal tournament just to get stronger and fight strong enemies. Jiren is marginally better in the manga because he's pure. Goku is somehow shit in the manga because Toyotaro draws him as a drooling retard.