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I imagine Eraqus's light will contribute to Terra being able to restore himself at the end instead of just dying as a Xehanort, that's it really.
The difference between Roxas, Namine, and whatnot is to understand that Eraqus is actually dead. He didn't just have his heart displaced, he didn't travel time, he died, and passing his heart to Terra was the last thing he did, so that Terra can resist Xehanort.
Death can be easily reversed in Kingdom Hearts. In Birth By Sleep, Snow White died after eating a poisonous apple that slowly, but thouroughly, melted her insides. But she was brought back with the power of love. I think that deep down, one of the characters loves Eraqus enough that they would kiss him and magically reverse the death. A character that always watched Eraqus from afar and wrote in their journal about how cute he is. And that character is Master Xehanort.
Snow White wasn't dead. She was in a magic induced comma caused by the poison in the apple.
The Poisoned Apple is a blood-red apple which, when bitten, will send its victim into the Sleeping Death. A victim of the Sleeping Death can only be revived by love's first kiss. It is used by the Witch in an attempt to do away with Snow White in Snow White and the Seven Dwarfs. The Poisoned Apple is also well-known as Snow White's trademark object.
Sleeping death = death, not a coma. She wasn't breathing, she had a frigging funeral lol, but she was brought back to life by her true love. Who's to say Eraqus can't come back to life with true love's first kiss. AKA, MASTER XEHANORT BLEGHBLEGH KISSY KISSY lol
.......This is the reason why people are so turned off by anime is because of fans who think of crap like this...
1. (Master) Xehanort
2. (Young) Xehanort
3. (Ansem) Xehanort
11. ??Anti-Black Coat Nightmare??
That leaves three.
Terra is a Xehanort, Eraqus is part of Terra, Riku appeared in a black coat before (and was a Xehanort host at one time), and the Anti-Black Coat Nightmare may or may not be a known Xehanort, but his use of a sword is notable.
Why is Sora on your list, the nightmare wouldn't be on there either, and I think Riku would be a bit of a stretch unless you meant Repliku
Sora was confirmed to be a Xehanort in The World That Never Was, and a Riku wearing a hood appeared briefly in Dream Drop Distance, also, remember that time travel? I think while Riku's Body was possessed by Ansem, he was brought to the future to play his part, and sent back with no recollection of it, like Young Xehanort.
Yes, but then we'd have the yellow eye'd/pointy eared Riku
Sora was saved from being a Xehanort