After an unteched Forward-B...
On Bowser, fullhop Down-B covers roll toward, get-up in place, and get-up attack. Charging an F-Smash or a U-Smash covers roll toward and get-up in place.
On Diddy Kong, charging a U-Smash covers roll toward and get-up in place.
On Kirby, fullhop Down-B covers roll toward, get-up in place, and get-up attack.
On Charizard, fullhop Down-B covers roll toward, get-up in place, and get-up attack. Charging an F-Smash or U-Smash covers both roll toward and get-up in place.
On Olimar, charging an F-Smash covers roll toward and get-up in place.
On Sonic, charging a U-Smash covers roll toward and get-up in place.
Charging F-Smash will also catch an Olimar teching Forward-B toward you!
Also, while it may or may not be common knowledge, if Ganondorf's U-Tilt is shielded and it isn't a perfect shield, that shield will be broken, period. This isn't like Bowser Bomb or DK Headbutt where it eats 90% of a shield--It just breaks it. (The exception is hitting only the lowest part of the explosion, which does 18% instead of 28%; this can be seen by putting Ganondorf on a side Battlefield platform and having a tall character shield it from the ground.)
I wonder if this could be used against a Ledge Roll or something similar; that's the only situation I can think of where we would have enough time to reasonably catch someone shielding; U-Tilt has pretty low endlag, so even if the opponent doesn't take the bait, you're probably not in trouble for it.