As for that video, it states all the points pretty clearly and enlightens me to Nintendo's relationship with Digimon. Plus, Bandai Namco working on this game too.
Only two points I have for it:
- I'd argue Agumon IS the mascot, or at least his digivolution line like Greymon, Metal Greymon, and WarGreymon. They're far and beyond the most popular and advertised Digimon. Agumon has the mascot presence like Pikachu has but the cool factor of Charizard, so it's a double win. If any Digimon would be considered, Agumon would be a no brainer.
- I'd probably not take too much frustration out on certain characters. I don't like Wii Fit that much either, but what fans she does have, this video would rub them the wrong way. Also, the digs on Ridley and Waluigi weren't terribly necessary, but I would have agreed with him if he mentioned Goku and Shrek as "dumber choices". In fact I thought he was going to say those before I heard "Ridley" and "Waluigi" and I was like "Woah Woah WOAH! Now just hold on there!"
As for all the other points, yes, Digimon has a lot of games and many of them where on Nintendo consoles. Agumon is playable in pretty much all of them and tends to be front and center on all cover art. One of them was a Smash Clone called Rumble Arena 2 (which I loved, and also loved Rumble Arena 1 on the PS1). So you have a game with obvious moveset potential to draw from. Agumon didn't originate from an anime, Digimon debuted on virtual pet toys that aren't too different from the Game and Watch games, and even Digimon World came out before the anime (because Digimon World lacked mega forms). Agumon would arguably be balanced like Mario. Jack of all master of none but have hope for some combo potential. In fact I always imagined Agumon fighting a lot like Mario, not even trying to compare Fireball to Pepper Breath.
The obvious Final Smash would be WarGreymon, either a single attack sending a huge sphere of fire or an actual transformation.
I wouldn't mind Greymon or WarGreymon as characters in place of Agumon either. If this was Brawl, you could go the Pokemon Trainer route (exactly like it was in Rumble Arena 2) and have Agumon, Gryemon, and WarGreymon be the same group of characters with Digivolve being the Down Special.
My favorite Digimon game is Digimon World, and my favorite Digimon were Greymon and Airdramon.
Edit: Go ahead and add me to the supporter's list.
Edit again: Your original post seems to be missing! All I see is a gif showing Agumon's digivolutions.