Zoro swore loyalty to Luffy. Interestingly there was a few times which Zoro implied he would only stay in the crew if they deserve it.
Chopper was inspired by Hiluluk's dream to travel around the globe.
Luffy gave Robin a new will to live, at a point which she believed there was nothing else she could find out about the Void Century.
That's a nice way to put it in words.
Dunno. Jinbe would want to preserve Ace's legacy I think.
Yeah, but Zoro wouldn't have joined the crew if there was no chance of him becoming the greatest swordsman. I don't remember Chopper being inspired by Hiluluk's dream to travel, but I do know he wanted to become the greatest doctor in the world, so that's another reason to travel with the crew. Luffy didn't give Robin a new will to live, he just saved her and I guess was obligated to take her with him as result. She didn't seem to get a will to live until a while after she joined the crew, probably before or around meeting Aokiji where he froze her and Luffy.
Thank you.
Is that not the same thing? I don't think Jinbei was keen on Luffy or helping Luffy or joining him or something until closer to the end of the war. I remember Jinbei not being as friendly to Luffy, but I don't remember more than that.
But the ones currently sailing with the crew have a reason to join the crew specifically. No character so far mentioned as contenders have any reason to join Luffy, especially not a kid who's a royalty.