Naruto has been over for 8 years lol, of course this poll is not gonna have much, still, as i already said, even people who dont know/like shonen are aware of naruto and sasuke.
On the other hand, the same cant be said for zoro.
Zoro ISNT the guy who comes to the mind of people when you talk about anime swordsman, as a matter of fact, sasuke comes before him on that swordsman popularity too aswell lol.
Go on a crowd of people who arent part of fanbases with ages between 18 and 35, show them one pic of zoro and one from sasuke.
Most will have zero idea about zoro identity, but some will DEFINITELY recognize.
You talk "anime swordsman" and those are the guys who come to mind:
I know, admitting your favorite character have little importance to the plot and it would go just fine without him is hard, but you gotta let it go.
Zoro wasnt, isnt and will never be as famous as those other guys simply because he is a one dimensional underling whose main goal is to acquire a title that no one cares about and follow orders from the MAIN CHARACTER.
He never had character development that vegeta, killua, sasuke and several others have gone through within their respective shows.
I understand the appeal, he is the 1d Samurai fanservice for weabboo teens who like to portray themselves through him and he is great at filling this role, but thats about it.
Dont compare him with characters who actually have gone through development within 600/700 chapters that zoro never got within 1080.