It occurs to me that I ought to run through a quick logical... thingie majigy before we get started.
1. Who wrote this fanfiction? Answer: Dwarven Runes.
2. Who is the majestic mastermind that created One Piece? Answer: Oda-sensei.
3. Is Dwarven Runes spelled O-D-A? Answer: No.
Therefore, Dwarven Runes is not Oda-sensei. Oda-sensei is kind enough to let Dwarven Runes run around blindly in the world of his creation. If Oda-sensei were writing fanfictions, and posting them on the internets, Dwarven Runes would be very surprised that he is not using them for his job, which is accumulating awesomosity in the form of the One Piece franchise.
Enjoy the fruits of my struggle to fathom the world of Oda's One Piece.
Luffy remembered the day he first met Zoro.
His first impression: what a weakling.
What strong person would let themselves get tied to a post? Che.
But he looked pretty strong.
Why'd he look so strong if he was weak?
He probably was strong.
But if he was strong, why was he tied to a post?
It was a mystery.
Luffy decided to solve it.
Solving mysteries meant patience. Luffy normally couldn't wait for anything. Especially food.
But Zoro wasn't food.
Along came a little girl. She clambered over the wall and walked straight toward Zoro. She offered him a rice ball.
Second impression: ah ha!
Zoro threatened the little girl, sure. But he didn't really mean it. The girl knew that on some level. Zoro knew that most definitely. And Luffy knew that without a doubt. Colby didn't. Shishishi! What an idiot!
So Zoro was a caring person.
But was he strong?
The little girl said he was.
So Zoro was a strong man.
Later, Luffy handed Zoro his swords. Zoro fought with him. Zoro ate with him. Zoro went on the ship with him. They sailed away together.
So Zoro was his nakama.