I still stand by the fact that the worst newcomer I ever saw support for was "Fire Emblem Switch Lord". That period of time when Smash was announced and 3 Houses was merely a title, and already people were throwing support behind a character we didn't knew how they fought, what their personality was like, or even if their game was going to be any good. When fans created mockup wishlist rosters, they would add "Fire Emblem Switch Lord" because they "might" have a cool moveset for Smash or because previous games added new FE characters. You're essentially wishing for an OC in Smash, and I would have had far more respect if they wanted Hector or Lyn or Camilla instead, because they at least had character we actually knew about.
I think that's part of why I'm not fond of the idea of Edelgard in Smash, because she's partially a holdover of the old support for the unknown Switch Lord where they would have supported them no matter what because they were the main character of FE16. Edelgard could have probably eaten a baby in the game and her support base wouldn't take too bad a hit because the marketing told you she was the main character and therefore gets first dibs.
There's some irony in that one of my most-wanted is a Lord from 3 Houses, but that's because I got invested in Dimitri as a character and have concrete proof of his moveset bringing something unique to Smash. Point is, fans shouldn't be in charge of picking characters purely to promote a new game, it's NINTENDO'S job to put Roy and Corrin in to encourage people to get excited for an unreleased product. Its OUR job to push for Ridleys and Banjo-Kazooies because we love the characters, not because we're wannabe Nintendo marketing interns.