I find it really weird that Luffy and Zoro are the two most important straw hats and the two most important characters in the history yet we know about their background the least.
We still don't know who Luffy's mom is, who Zoro's parents are etc.
But Sanji Nico Robin Nami Jinbei all got their character arcs.
Is Oda gonna give either of them a character arc or will their role always be fight the strongest, fight the second strongest, become WSS, become Pirate King?