I mean, he's kind of meant to be unlikable, he's imo a realistic portrayal of those generic isekai protags that have no discernable personality beyond "do the right thing" (insofar as their selfishness allows, and Sensei's definition of things that're "wrong" is pretty fucking narrow) and "fuck anything even vaguely female that even looks in your general direction".I really like the girls but god damn I really don't like "Sensei" at all.
He's kind of an uninteresting dickhead... if the universe wasn't literally conspiring to get him together with a load of highschool girls he'd probably have no social life at all.