I kinda had this question since I played and completed Kingdom Hearts 2: Why did Xemnas coat change at final-FINAL boss battle? Is it due to The World That Never Was collapsing (As time goes on in the battles the world begins to collapse and turn into a black hole. At the final part of the battle the White world is the aftermath. A void of nothing. This is kind of a theory I thought about for this stage.)? Or is it because he is finally getting weak and this is just a sign?

I think that it was an unimportant addition to him "absorbing" his Kingdom Hearts near the end of the game (a concept that I myself do not fully understand).

I don't think it was him absorbing Kingdom Hearts cause it was still there when they were fighting and I think he turned into the Armored Form because of what you said...Now it could be that it could've made a stain on his coat...But still, like you said not a 100% sure...This is my theory: Xemnas, being the leader of the Organization, most likely made The World That Never Was since he has control over Nobody's...Being this, as they fought him, he began to get weaker; and with him being weaker it made the World itself unstable...Now it's just where would his coat changing fit into all of this....

Actually, I think you're right! The black hole was Kingdom Hearts! That was the aftermath of it! And Xemnas' coat stained in the same way Danny Phantom hair has gotten the straight line of white due to him becoming a ghost again! So it was due to him being in the Armored Form but because it was in an imperfect and unbalanced state, it left a stain!

I also think it symbolizes the final union between Light and Darkness

Edited November 22, 201311 yr by Larxy

He wanted to look "fly" for his final battle

Maybe that's just his most powerful form. When Sora goes into Final Form, his clothes turn black & white. That was Xemnas' final form soooo maybe that's why...Idk.

Actually, I think you're right! The black hole was Kingdom Hearts! That was the aftermath of it! And Xemnas' coat stained in the same way Danny Phantom hair has gotten the straight line of white due to him becoming a ghost again! So it was due to him being in the Armored Form but because it was in an imperfect and unbalanced state, it left a stain!

This is really off topic but....I think Chie should be the main lovers route for Yu or Seta whtever you call him

This is really off topic but....I think Chie should be the main lovers route for Yu or Seta whtever you call him

You saw signature! I call him Yu, seems more fitting....I think it depends....I like the idea of Rise and Yu....Some may say Yukiko and Yu but I really don't see that....