I think I doubt it just because I don't see Chell's movement being practical.

All stages have floors, most of them have platforms, and very few have tangible walls. (None have tangible walls in Battlefield, which is of course meant to be a legitimate way to play the game)

So really all we can see her doing with the portal is shooting the floor, or shooting a platform that functions as a ceiling.

I'm also not seeing an easy way to implement aiming in Smash.

Aside from "shoot blue portal" and "shoot orange portal", all of her moves would have to be entirely created for the game, and out of character. I mean, I can theorize that she would do a slide kick or whatever, but it's never been in the source material. She never fights anything.

IF there were constant walls/ceilings/whatever, (or if her moves spawn temporary walls and then use them), then she could have a really cool combo/moveset that involves going in and out of portals, and using momentum to hit other characters.

But as of the way Smash is built, it makes it REALLY hard to 1) aim, 2) depend on walls, and 3) fight with a character that only shoots portals.

So I just don't think she's a super good fit.

Don't get me wrong, I think there is some chance that a moveset could be made, particularly if we're OK with her having jab attacks with the portal gun, and kicking sometimes or whatever, and definitely if we're OK with her moves actively spawning walls or turrets or whatever, then it could be done.

But it just seems like such a huge stretch, the much easier solution seems to be, yknow, just not adding her.