Yeah, I think I remember reading somewhere that sociopaths aren't a recognized psychiatric category and that the real category is a psychopath of some kind so you're more correct than me.
Leaving aside the translation for a second... I really hope one of these monster girls points out to Elf-sensei that they literally became monster girls because of the MC.
Not really fair to call him dense when half the premise of the comic is her acting aloof and emotionless all the time.
(though he probably is completely dense... we just haven't had a real chance to see it yet)
I dunno. I figured he must have something like this since they've been saying since the first chapter he had some secret technique that made up for him not having magic.