Mario talked loads in Mario's Game Gallery / Mario's FUNdamentals, a game where Mario hosts various bland single player computer card games like Go Fish and acts as a 'fully interactive' second player. It's the kind of thing I would've loved as a lonely child with no friends XD It's also the first game that I know of where Charles Martinet voiced Mario, though I think he did certain Nintendo presentations even earlier (and Super Mario 64 and Mario Teaches Typing 2 came not much later).
There are totally stories with silent protagonists, in cartoons, but yeah I don't think Nintendo really treats Mario as a silent protagonist these days (awesome as his pantomime in Super Mario RPG was- speaking of which, I'd love to see that game adapted into a movie or OVA, but it'll never happen. We'd get an FFVI movie/series before that), except maybe for Paper Mario.
One thing that could actually be a fun, would be to deliberately play off of how strange Mario's setting is. If Mario is meant to be from Earth (I'm not sure if this is canon? The whole Brooklyn thing?), then it could be about him and Luigi's first encounter with the Mushroom Kingdom as they find out how strange everything is, and the alien physics it works by. That could also be why they're so great at jumping (Mario's jumping is much more mundane in, say, Donkey Kong). It's like a universe that runs by totally different (and much more forgiving) physical laws.
I can't imagine them not having Bowser kidnap Peach. You want it to avoid the most common, well-known trope in all of Mario when there's never been a 'proper' movie about the subject? That seems implausible. But they could play with it, having Peach be proactive like in Paper Mario when she sneaks around the castle Metal Gear-style. Or maybe even something like this. They could also have other complicated stuff going on, but I'd say the one foregone conclusion is that Bowser will kidnap peach, at least to the extent seen in Super Mario RPG (where it was right at the beginning for a couple minutes before the real plot crashes down on their heads).
I wonder if the Koopalings will appear. Luigi will obviously appear (lest there be rioting in the streets), some manner of Toads and Yoshi probably will, and I doubt they could refrain from Bowser Jr given Nintendo's marketing for the past 15 years, but the Koopalings are always on the fence about getting worked in or not (though with Mario Kart 8 and the New Super Mario Bros games I think it's been on a bit of an upward trend for them maybe). Wario is also anyone's guess. Donkey Kong seems like somebody they'd at least make a passing reference to. But Geno and Mallow are only in my dreams.
Edited by Mitsukara, 04 February 2018 - 10:58 AM.