Favorite of Kuja's motifs

[Kermitu Kleric Katie]

As you might know, I love The Darkness of Eternity
Kuja's Theme: Exactly What It Says On the Tin
Immoral Melody: Plays when the party spots Kuja on his dragon at the Iifa Tree.
Devil's Ambition: plays when the party confronts Kuja at the Iifa Tree
Kuja Exits Burmecia: plays when Kuja exits Burmecia
Bahamut is Summoned: plays when Brahne Tries to kill Kuja with Bahamut
Destruction of Brahne's Fleet: plays when Kuja destroys Brahne's fleet
Neo-Kuja's Downfall: plays when Kuja destroys Terra
Kuja's Theme(Millenium Version): plays in Desert Palace.
The Darkness of Eternity: Plays when you fight Trance Kuja.

 

[Ⓐaron]

Dark Messenger, of course. Most of Kuja's themes are great but Dark Messenger is just amazing.

I also particularly like "Kuja 5", an alternate version that, as far as I know, wasn't included in the game. You can find it on Final Fantasy IX OST Plus.

 

[Shakarian]

Dark Messenger.

2nd favorite is Neo-Kuja's Downfall, I love the FMV where it plays

 

[Captain Jack Harkness]

Kuja 5 and darkness of eternety

 

[Kuja9001]

Dark Messenger & Immoral Melody for me.

 

[Farron]

Immoral Melody because it sort of sounds like We Will Rock You. Though it can get annoying if it's played for too long, like in Kuja's Palace.