Now I'm really curious as the what happened to Mihawk to cause him to shift from wanting to fight all the strongest people, and being known as the Marine hunter, to just wanting to live peacefully.
It wouldn't make sense that it's because he reached the top, because those who typically do, always desire more. So something definitely happened to tame what seems to be a fiery nature in his youth.
I think it would be interesting if he killed someone during a duel, that he soon came to regret. It could add some real depth to his character.