>>38827438From BW1 we pretty much know that he's a staunch believer in the bond between humans and Pokemon, even risking his life just to prove N wrong.
He hunts down the rest of the sages, so we can say he doesn't leave the job unfinished; he's probably pretty serious.
Cheren, Alder and all of the gym leaders, some of the strongest people in the region, have mad respect for him and trust him, so he's a leader (contrary to Red's loner nature).