At first he kind of a jerk but it grow into me how somehow relatable And him being smug jackass always funny.
Basically saiki kusuo if he doesn't have power Pretty good at everything with "don't bother me" attitude and want to live in his own world
Another one is that he so full of himself even to his family. He have beef with no one and have it at the same time. Like he call his gramma suck
And him being smug jackass always funny.