Have you heard Roy? In either language he's extremely loud in Smash, and that's what people absolutely love about him in Smash compared to everyone else. You can go on twitter right now and see that his personality is what people are into, not Binding Blade as a game.
And uh yeah, he's frail, especially compared to how he appears in Smash, whose design doesn't even originate from an actual game.
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The difference between Corrin and Chrom is that Corrin is incredibly panned to this day, meanwhile Chrom's opinion has only ever risen with time. If you want to go by Choose Your Legends and be bereft of its contexts then you may as well go as far as to say Camilla is a more popular character than everyone else there, Hell you may as well say Gatekeeper is the second most popular Fire Emblem character in the franchise, period. If you want to say "she has fans" that's true and I agree, but saying she's Chrom levels of popular due to CYL and nothing else is flawed as hell reasoning.
Yes, Roy is quiet in English. The best example being his Up-B. When Roy in Japanese does his Up-B, he's not just loud, but even goes higher-pitched. When Roy in English does his Up-B, he clearly gets quieter as he attacks. And Roy in Smash doesn't look any more toned than Fire Emblem Roy. They are both clearly showing muscles.
And bringing Camilla up, yes during Choose your Legends 3, she was being supported by people who clearly voted her for the memes after her 5th alt, but she was clearly popular long before that. She was Top 4 in the first one and Top 3 in the 2nd one. Heck, she clearly has alot of popularity because in the first one, she had more votes than many popular characters, including Chrom, Marth, Eirika, Micaiah, both Robins and was just below Hector and the 2nd time, she still beat Chrom, both Robins, Eirika, Micaiah, Alm, and was just under Marth. Like sure the voting is somewhat skewed by the winners being taken out of voting as well as people voting together to help one character, like in the case of Micaiah or Eliwood, but she was still clearly a popular character before then.
It doesn't work for Gatekeeper cause most of the really popular characters have been taken out by then(specifically 8 of them if you do males only). Had it been CYL4, there might've been some merit about him being the most popular Three Houses character had he been 1st or 2nd since he would've been more popular than Dimitri or Claude.
With Camilla, only 8/4 of the most popular characters/females had been taken out. Her consistency hardly strays. When CYL2 happened, Echoes had come out and Heroes had been out for a while, so of course Celica and Veronica were above her due to recency bias(and people wanting Veronica already), but Camilla still placed 3rd and she was above Eirika and far above Micaiah in both CYL1 and CYL2.
Had Celica not been around, Camilla would've more than likely gotten her Brave Alt on CYL2 and because that would've been before her surge of Alts, she would've won by popularity with very little meme votes. Heck, she was below Veronica by around 1000 votes. She almost got 2nd in CYL2 in the first place.
Much to the chagrin of some of us and despite how panned Fates' story and some of it's characters were, Camilla is very clearly a popular Fire Emblem character and to say she's a more popular character than most of the other characters there would not be that far-fetched, especially when her game not only sold 1.6 million copies, but she's part of the title screen of Fire Emblem Heroes, was part of the character loading screen twice and is a very common Green unit you can get.
Fates' characters being panned didn't stop Camilla from being a popular character and being panned doesn't stop Corrin from being popular. And opinion of Chrom rising after his "chance another day" meme wouldn't have stopped him from being hated had he been in Corrin's DLC place. The issue isn't the character. The issue at this point is because it's more Fire Emblem main characters with swords.
That said, when there were alot of people positive and happy about Sakurai mentioning and adding the Gatekeeper to the background of Garrag Mach Monastery in Smash, that should say something about his popularity among Three Houses fans. Now can we get back to wanting Lyn and hoping a Fire Emblem 6/7 Remake comes around the time of the next Smash's development?