Thinking about Pokken again (unhealthy, I know), and there's this one really minor mechanic I really liked.
Where most fighting games have a crouching stance while holding down when grounded, Pokken also has an "up" or "high" stance when holding up since it uses a jump button ala Smash.
The interesting thing is that beyond just aesthetically showing that up is being held, they also provided some minor passive benefits since crouching already made you a harder target to hit. They range from charging characters' meters to providing passive super armor to certain types of moves.
Since Smash follows the same principle (assuming of course you're playing with tap jump off), I was thinking about some passive stances you could implement to the existing Smash fighters.
For example shield fighters could have it so that holding up has that projectile blocking thing they get when they're standing/walking.
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Characters that canonically hover can float off the ground menacingly to not get their toes clipped by low attacks.
You could even make go more in-depth with other characters like Cloud accessing his new Punisher Mode from FF7R to get some different normal attacks than usual.
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Any ideas for other characters' high stances? It's not exactly a major addition, but it'd be neat to see.