Roronoa Zoro and Magnus Chase
Honestly? Zoro didn't expect anyone to know about the East Blue. Just as he could probably mention the North, South, or West Blue and people would be more than a little confused. Like the idiot cook that he knew was from the North Blue but Sanji wasn't in Madison Valley.
There's a bit of a smirk out of the swordsman," I don't know. You'd probably be able to pull it off." Though he knows not everyone would be able to pull off the green hair. Him? He's had it his whole life.