I thought the clip was funny, and so I found a good excuse.
Anyways:
all this of course as a counterargument to ikes 'walling', the 'bane' of luigi.
no sane person rolls into his nair, his nair doesnt wall.
Nair can be used to "wall" opponents, but you have to consider landing options, too. If luigi gets close after a nair, we aren't going to throw another nair because of the startup frames. Nair has little cooldown so a jab or even bair would suffice.
You also have to consider that Luigi has trouble getting in, then both are essentially at even ground up close (Ike adv up close at low-mid %s, Luigi adv up close at high percents).
his fair walls, but stationary or approaching fair can definitely be rolled through(unless in this case, luigis, invinc frames arent during roughly the first half of his roll, but ima assume like any normal character they are).
Fair can't be rolled through very easily. Fair ends underneath Ike, which has a high chance of hitting Luigi during a roll animation. That is why some Ikes like to use retreating fair, because it covers rolls as well as other options. Also, I haven't heard of Luigi having a spectacular roll.
Fair, Nair, and jab all easily beat rolls. I was confused why you even put rolling as an option, considering good Luigis would probably never do something like this.
Initiate the roll as late as possible during fairs startup (way easier than as early as possible).
Retreating fair is a stalemate, but loses ground for ike.
It's too much of a risk for Luigi. Too early and he easily gets hit by fair. Too late and he gets jabbed. Good players won't consider this as a decent option without an above average roll.
btw need i mention that you forward roll behind him? rolling in front of just gets you hit LOL and fair doesnt hit behind ike(unless you count ike's back lol). sh fair doesnt AC, not sure whats the deal with fh.
You must realize the distance you must cover to roll behind Ike and miss getting hit by the end hitbox of fair which is in fact underneath and slightly behind Ike. Most Ikes retreat when using fair, which is even harder.
im iffy 'bout bair, it shouldn't wall but i wouldn't be suprised if it worked against luigi o_O. this of course due to mediocre range that suffices vs luigi and the sh AC. PS ***** bair, but i'll leave that out of the equation (for now..?).
PS doesn't **** bair. If Ike is retreating (which he should) Luigi is not fast enough to catch unlike characters like MK, Sonic, and Fox. You must also realize that it's a mixture of all of Ike's aerials in conjunction with his ground game.
I didn't feel like responding to this post because from my point of view you don't really have much knowledge on either characters' options if you listed Ike's ftilt as a spacing component and Luigi's roll as an approach.
Also note that I did not say Luigi gets permanently walled. Look a few pages back, and I even question the logic myself. Luigi needs clever mixups in approaching mixed with fast intercepts.