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.
Several characters have met their demise in the MHA manga, but it's a bit complex to list them all precisely. Some of the notable ones include [mention specific characters if known].
I think it's hard to say for sure. There are a few characters who could potentially be the traitor, and it's all part of the mystery and suspense of the story.
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.