O_O Before I read your post, I thought that was a Kuja Cosplay ...
Anywho: *SLAP* How dare thee! Nomura lacks the brilliance to design Kuja. Amano did that T_T But thou shall be forgiven for rocking, and having friends that rock at Cosplay =D (Seriously, your friend is awesome as Kefka)
Oh crap, you're right! Nomura actually had his hands off the FFIX project, which is why the designs looked....hmm...ORIGINAL?! And, thanks. I'm making a FF6 Soldier outfit so I can go around in his videos and get abused. I'll be carrying around a duster for when Kefka goes "AHEM, There's SAND on my boots!"
Back on topic: [I'm sorry, mods. I keep veering off track in this thread. D=]
Kefka was used as Cid's first guinea pig in building the army of Magitek soldiers. There we no immediate effects when he was infused with the magicite, but he cracked several years later.
Just one point I'd like to bring across about Kefka:
He's the ONLY villain in the Final Fantasy series to be the sole reason for the world's demise, from the beginning of the game, to the end of it.