Geno's consistent in Japanese polls too though. I'd argue that there isn't a big popularity gap between North America and Japan like in the cases of Little Mac and Ridley.
It's actually because of the Japanese poll that I became aware of Geno's popularity and thus began my first foray into supporting Geno for Super Smash Bros. Brawl back in 2006. I think Geno is still in a good spot.
That is one hope I have if Nintendo of Japan chose all five DLC fighters. I remember that there were two old polls: one where Geno was #3 in popularity, right below Sonic being #1 and Mega Man being #2 in popularity. Then there was one where Geno was right below King Dedede and Diddy Kong on the old poll from 2006.
There's a chance that Nintendo of Japan and Sakurai want to finish off the old Brawl poll from 2006 because they did continue to use it in Smash 4 with Villager and Takamaru, and they used it in Ultimate for Ridley and Krystal.
1. King Dedede
2. Diddy Kong
3. Geno
4. Ike
5. Ridley
6. Olimar
7. Krystal (Assist Trophy)
8. Takamaru (Assist Trophy)
9. Toon Link
10. An Animal Crossing character
Except for Geno, all of them are in Ultimate. Nintendo could be using this, or they could've asked Sakurai if he had any ideas for a highly requested newcomer on his mind, so with the 2006 Brawl poll as a reference for a highly requested character, all that's left was Geno. I know I might be getting my hopes up for no reason, but there IS a chance Sakurai and Nintendo want to finish off that Brawl poll, after all, they did put two characters in Ultimate from that poll.
PolarPanda
's source said 2 highly requested characters, so Nintendo could've used the 2006 Brawl poll and/or the other one where it had Sonic and Mega Man above Geno.