That poll was the official one Nintendo ran back in the day. It was basically the equivalent of the Smash Ballot back in 2000. Like I pointed out, nearly all the popular picks made it into the game in some form and a lot even carried over to Brawl.
But literally no other third party has been added because of check boxes. No one. Everyone has international appeal. Snake was a request from Kojima but sure as Hell came back because of fan demand. I already explained Ryu. Dragon Quest would be the exception on a ton of fronts.
Honestly, based on everything, I think people are overselling Dragon Quest. If something like Yokai Watch is totally skipped over despite Level 5's pockets-in-pants-and-wiggling-eyebrows relationship with Nintendo and absolutely explosive modern popularity in Japan, why Dragon Quest? The only argument people have made is legacy and it's already been pointed out that this is just as hilariously one sided in Japan as it is Yokai. Okay to hard liquor for breakfast depressing sales wise in the West. Again, it goes back to check boxes and there are characters within Square Enix itself that would not only be easier to get but are actually wanted too.