One character that would fit well is Robin. Her knowledge of the world and its secrets could be relevant if there's some mystery involved in the Zoro - Mihawk relationship. Brook, with his unique personality and his own skills as a swordsman, could also be included. He could have some interesting conversations with Zoro and Mihawk about swordsmanship. And Shanks, as a great swordsman himself and a significant figure in the One Piece world, could potentially play a role in the story, perhaps as an old acquaintance of Mihawk.
The Wano Arc has indeed come to an end. It was a long and action-packed arc with many memorable moments and plot twists. The conclusion wrapped up various storylines and set the stage for new adventures.
The Wano Arc did come to an end. It was a long and intense arc filled with many memorable moments and plot twists. The conclusion wrapped up various storylines and set the stage for new adventures.