>>11850281As far as I remember they do not respawn every chapter, it just adds more monsters. So if you skip a group, it will be bigger next chapter. However, if you kill it, in the next chapter it will only have the added monsters.
I would advise against it OP, the game is structured in a way that monster strength is supposed to serve as a natural barrier for you until you level up. You can absolutely kill everything in the prologue (which is a fun challenge run), but you will make your experience boring for the later half of the game.
Also I think english dub is quite bad. Polish and german versions are best.