Option "I feel the mechanic is unnecessary, but it doesn't have a negative effect."
Since I have never played any of those fighters, I am unsure about them. Seems interesting to have them play like traditional fighters, since I have a feeling that if Ryu played like a traditional Smash character, he would play very similar to Mario.
Seeing Mario in advertisements is pretty amusing, especially for unrelated things as long as he's graciously represented. I've seen one (I'm sure unsolicited) ad where Mario is standing on a mattress using the Fortune Street pose (see the Wii's box art to see what I mean), with a US flag to go with it.
I'd much prefer content all be available on the disc/cartridge at launch, but I get we live in a time where it is possible to keep building on implemented ideas (in which case, sequels are a thing). It depends on the quality of the DLC for me. If it's being made alongside the game, and then held off for more profits, then just include it in the game, no likes paying for content that should've been in the game in the first place. But then you have games like Super Smash Bros. 4/Ultimate and The Legend of Zelda: Breath of the Wild that adds expansive content that started development after the game was finished and they give it all as much effort as the base game. That's the kind of DLC I like.
I really dislike Season Passes. They're typically a gamble, and you're essentially paying money for an idea they had, with nothing actually done yet. I know Nintendo is slightly less egregious than what other companies did (like in Hyrule Wariors or in Smash Ultimate, where they were already complete games), but I wouldn't be surprised that they indulge in it in their mobile offerings on top of the microtransactions, grindfest, and expensive subscription models that fix problems that they invented.
None of the poll options really describe my feelings on this. I do prefer DLC where I can pick and choose, but that also depends on what the DLC is, what the price of it is, and its practice can be equally as bad as the Season Pass should it also be mishandled: Season Pass for Ultimate is better than individual DLC offered in, say Fallout 76 because it's for a much better, content rich game to begin with.