I have to wonder about that. I'd sooner say that because she's gone, she can't stop them from being hurt and that her existence to begin with hurt them.
Alternatively, not quite being forgotten but more having promises that were never fulfilled. Adds up with her being shown next to Namine who despite what happened in the datascape, still needs to be thanked to by Sora.
Then there IS the option that she can even be in torment because she didn't fade. Regardless of whether or not Repliku was tormented - he had nowhere to go to 'keep' that torment at.
Well the reason I didn't consider the option Repliku ceasing to exist entirely is because Nomura did say later on that there is no concept of death in the KH universe.
Some people were like "what?" but I knew what he meant(as Eraqus clearly "dies"), the eastern concept of death is that the soul is a generic life force that gets cycled into a new being each time that being dies, and that if one dies, he ceases to exist as himself, but his life force may reincarnate someday.
The western concept is that the soul is specific to each individual and death does not cause the ceasing of existence, nor the "cycling" of that soul.
KH combined the two, you can see the pyreflies(that is the soul, that's essentially the exact same thing as the lifestream you are seeing) and at the same time you can see the heart, which is specific to the individual.
So repliku ceasing to exist entirely is contradictory to what Nomura said, whether he said it after CoM or not.
The worst fate that can happen to the heart in the KH universe so far, as we've seen, is that the darkness in it causes the heart to collapse entirely, and it is imprisoned in "sleep" in the RoD likely.
The reason I can't see Xion's torment as being her sleep is due to her last words when Roxas fainted, she thought of her death as a return, not a "death".
The torment of anyone outside TAV is rather confusing in itself imo, and hasn't been made that clear. Roxas and Namine smiled through each others somebodies in the KH2 ending. I get the feeling that this torment in itself has nothing to do with just the "death" of these individuals.
I would pin it at.
Terra-Possessed by Xehanort, worried about what he might do to Aqua and Ven
-and depending on what the lingering sentiment is, this guy's been torn apart in more ways than a block of cheese through a grater.
Aqua- Trapped in the RoD, worried about Ven, if he will ever wake up.
Ven-Comatose, worried if his friends survived/are okay.
Roxas- Unable to remember someone important to him
Axe-Unable to remember someone important to him
Xion-Her friends don't remember her.
Namine-Unthanked for what she did, and her experiences in CoM unremembered by Sora.
Namine is the only one that doesn't fit with the six others(her existence itself is one hell of an anomaly), the six others I guessed at being specifically about their friends, not themselves.