He's actually a really interesting character trapped in a mediocre manga.

He was one of the leaders of a revolutionary peace movement in a county wrecked by one of the world wars, and was on the path to making peace with the leader of his country before one of the great imperial powers sabotaged their potential alliance and tore their country apart in civil war. He's a withered husk in the picture there because of an injury he sustained during that betrayal, and his revolutionary peace movement transformed into a plan to acquire WMDs to enforce peace and stop the next world war.

What's the point of saying this? I didn't know who it was either, it took precisely 5 seconds to reverse image search and find out it's "Nagato Uzumaki, a central character from the Naruto manga and anime series."