You said tied down to a "specific game" which Terry obviously isn't considering most of his content isn't even from Fatal Fury. And the last Fatal Fury title released over 20 years ago, so, in a way it's no longer a thing yes.
Edit: Not to mention, Fatal Fury itself isn't a specific game, but a series of games.
It's still what was used for his SSBU X title card. What I'm saying is, Terry is the star of his show, Fatal Fury. Since Fatal Fury is pretty closely connected to King of Fighters, which itself is tied to pretty much every major SNK property under the sun in some way, he also gets to represent those series as well.
The characters discussed in that post don't have that, at least not to the same level as the other characters. Bandana Dee has always played the helper role, so his impact on the series is spread out rather than concentrated in a specific game or subseries. As such, he'd only have a general Kirby pack without many characters who are more than tangentially related to him. Dixie
did star in DKC3, but I don't see that one game getting a dedicated back just for Dixie. Waluigi's entire shtick is being the guy who never has good things happen to him and he hails from the most heavily represented series in Smash, so there's not much he could bring beyond himself.
Characters like those, supporting characters from already-represented series, are geared more towards being part of the base game than being DLC.
I think Terry and Pac-Man are the same in the sense that both are supposed to represent multiple games related to theirs.
There was never a character from a similar franchise before them, but does anyone think we're in a good position to get a second Namco arcade or SNK rep? Personally, I don't.
Yeah, they managed to cover a lot of bases. At least with Namco, they've got more bases than the arcade scene. SNK is very much arcade-based, and Terry managed to cover just about everyone from them.