Oh sure there must be fans. Persona always did well I guess, if for nothing else that they have 5 games already. I am also not ONLY interessted in gameplay, I was just pointing out that it's very hard to get excited for a character like this when you don't know him. I already dislike just about any 3rd party character unless they have strong ties with Nintendo, say; Rayman, Banjo-Kazooie, Shantae, Bomberman... those sort of characters, This Joker is literally from a franchise that originated on a different home console, and that's up untill now the most "far out there" character in the game. Even Cloud has more connection with Nintendo due to various cameos and Final Fantasy originating on Nintendo.
I didn't only say advertisement, I also said business deal. And that is exactly what Joker is. Cloud too. Corrin however, that was purely advertisement and probably one of the very few Smash characters that got in for this reason. I can still dislike the addition. Don't tell me what my opinion should be.