I agree fully.
I think i worded my previous statement wrong, what i meant was, his chances are low, but as long as we get Bandana Dee first, Marx would fit in perfectly into the roster in my opinion.
My only worry is the moveset.
Flying could work kinda like R.O.B. that's fine and all. But his ariel attacks i imagine would be a bit tough...
Puking Balls that send shockwaves and etc. i feel would make going against Marx be really annoying, considering they'll stay in air all the time for those overpowered attacks.
Here's a custom moveset i found, it's a good moveset, but it kinda show's my point about me being afraid of his strong abilities
Dash attack should just be a Standard Special, and not that fast probably
Standard Special kinda looks way to chunky hitbox-wise, and it looks more like some sort of final smash.
Down ariel needs those shockwaves removed
An Up ariel that Recovers would be way to broken, imagine using up ariel and then Up Special? That's way to good of a recovery! and let's remove the cacti
Side ariel is ok, just make it hit about say, 3 times.
Standard Ariel is good, but imagine how much space it would cover for a single standard ariel, unless marx is super duper small, which just wouldn't work.
Final Smash is perfect, however, but maybe without Nova, I'm about to make the "it's too big argument here" but the ending of Milky Way Wishes showed us that if Nova was the size of a soccer ball on earth, Marx would be the size of a single very very small fly.
Maybe just have the black hole then marx dashing through it maybe.
If he does get in, I'm just afraid he's going to be another Bayonetta.