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And Zoidberg: Vanitas. Often.
Attack Of The 50 Foot Whatever: Xion, just... Xion.
Blessed With Suck: Riku, Terra to name a couple.
Bald Of Evil: Xehanort
Beard Of Evil: Xehanort
Butt Mockey: Donald
Cloning Blues: Variations almost everywhere.
Cinderella Circumstances: Trope Namer and Riku, courtesy his stepfather.
Cursed With Awesome: Riku, the Replica, Terra and Axel?
Dark Is Not Evil: Riku, Terra
Emotion Eater: Vanitas
Enemy Within:
Enemy Without:
Even Evil Has Loved Ones: Vanitas, eventually...
Evil Cannot Comprehend Good: Vanitas
Evil Counterpart: Vanitas, to Ven and all the other Soras.
Evil Is Sexy: Vanitas, and others...
Evil Twin Quintuplet: Vanitas
Eyepatch Of Power: Braig/Xigbar
Fridge Brilliance: How we come up with this shiz...
Good is Dumb (Which seems to have been removed entirely from TVTropes...): Sora confirms this for Vanitas.
Grand Theft Me: Terra is suffering the aftereffects of this. Also the random possession moments.
Guns Akimbo: Braig/Xigbar
The Heartless: Seriously, How Did We Miss The Trope Namer?
Heel Face Revolving Door: Vanitas does this for the lulz.
Jerk with a Heart of Gold: the Riku Replica
Jerk with a Heart of Jerk: Vanitas
A Light In The Distance: Aqua, upon finding a way out of the Dark Realm.
Luke I Am Your Father: Sephiroth, to Riku
Meaningful Echo
Meaningful Name
Names To Run Away From Really Fast: Does it need to be said?
One Winged Angel: Riku, Replica (literal); Xion (DON'T PISS HER OFF) and the Trope Namer
Pale Skinned Brunette: Vanitas
Superpowered Evil Side:
Theme Naming
Twin Quintuplet Telepathy
UnEvil Laugh:Vanitas, Demyx to a lesser extent.
Villain Protagonist: Vanitas