Sora and Auron performing the Bushido Limit, one of my favorites
( wish I could take Auron to other worlds to use it against stronger foes T^T )
I especially liked how Auron had many more references to his original incarnation than most other Final Fantasy characters. The way that his dialogue was taken or paraphrased from Final Fantasy X or how he turns into pyreflies when returning to the Underworld.
warning: use of Bushido Limit against hook bats can be pretty worthlessEDIT: added Sora's mouth, thanks for the tip guys, I owe you