Kuina passed away in the manga because of a fatal stumble. This incident left a lasting impression and influenced the plot and characters' developments.
Well, in such a fanfiction, there could be various hints. Maybe Zoro's behavior might be more in line with typical female characteristics described in that specific fictional world, like being more empathetic or having different social interactions compared to the original male - character version. But it really depends on how the author has crafted the story.
Zoro.to might have manga, but it's often associated with copyright infringement and potential security risks. It's better to use legitimate platforms for reading manga.
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.
One day, Zoro got lost as usual on the ship. Nami found him and instead of scolding, she showed him the way with a smile. Since then, Zoro started to notice Nami more. Their relationship grew slowly as they fought side by side against enemies. Zoro would always protect Nami in battles, and Nami would patch up Zoro's wounds after. It was a quiet, budding love story.