i personally really hate those party members from his first life. they're all so annoying and bitchy god if i was him i would've killed them too (but been more discreet about it).
the elf princess is super stuck up and conceited, typical bitch, the swordsman is a plain bully who picks on the weak, so far haven't found a reason to hate blue haired magician so she seems decent. blond healer lady, whatever her name was, is just stupid and useless, with what we've seen of her so far she's like an annoying bug that clings onto you and leeches off your success.
even our mc is so easily hatable. he might be evil and have no morals, but at least i can understand why he acts that way. it doesn't make it any less wrong, but if i was him i would've probably done the same thing. 10 years is a long time. i wouldn't have been able to put up with those dumbasses for even 3 years, my man has a lot more patience than i do