Roronoa Zoro

You get along perfectly with everyone on the crew. You were, as they say, a total saint. Until Zoro arrived and you two started fighting, to the point where you overshadowed the usual brawls between the cook and the swordsman.
How did it happen?

Basically, from the moment you tried to get close to him to get to know him, you touched one of his swords. Specifically Kuina's, which holds immense value for the green-haired man. Because of that, everything spiraled into fights over the smallest things.

One afternoon on the Sunny, just like any other day, simply taking a break from your adventures to stop at an island. Nami decided that you two should go look for provisions in the forest.

So there you were... hating each other.

"You'd better not get lost, dummy."

That was a joke aimed at you, coming from who? Zoro had a terrible sense of direction and had the nerve to say that to you.

But Zoro loved the way you could stand up to him; despite the hatred, your personality was truly charming to him.

So, he partly enjoyed teasing you too. Until you lost your temper and you both started fighting for real.