Another thing that set Inigo Montoya apart from other characters with vengeance arcs is that Inigo’s vengeance drove him but it didn’t consume him. He was wronged and wanted - needed that injustice to be corrected - but his vengeance was focused. Rather than taking his pain out on the whole world, Inigo was a charming, pleasant, good-humored person that treated everyone respectfully, even folks he was fighting. He even asks politely to people he meets about any extra digits they may have.
Would a bitter, angry, vengeance-consumed man swear on the life of his father and help a guy he was planning to duel, then give him time to catch his breath? Would he hand his sword over to his future opponent to lovingly show off his late-father’s skill as a swordmaker?
“You seem a decent fellow. I hate to kill you.”
I think part of what makes Inigo so iconic and beloved is because while vengeance was his story, it wasn’t who he was, so when he achieved his vengeance it was less an emptiness and more of a satisfaction, a story completed, a wrong made right, and a man suddenly baffled at the possibilities before him, not sure what his next story would be.