The only thing I remember is that the MC used a spear and sword simultaneously as his main fighting style. But since that is fairly unique, I hope someone else knows.
No clue, but MC did get critique for it. Will read to check, but skimming it would place the fighting style fairly late as far as I can see as it is sword and shield in random chapter of vol.2
Because I also remember the MC getting critique for it. I don't think so, will try these out regardless
rather than a spear, it's a shortspear in the invincible saint. MC is convinced about this style after fighting a certain powerful undead. The critique did come from a guild master of adventurer who train him in physical/martial arts