Kefka is a gold mine of quotes. You can't beat madmen deities.
My favorites from him:
"Ooh! They're warm to the touch!" (when getting the magical mcguffin)
"I command the greatest power in the universe! You are all helpless before me!"
"Now, for my next trick, I will make you all...disappear!"
"I'm all-powerful! Hee, hee, haw!"
"Hee, hee, hee !! But what fun is destruction if no 'precious' lives are lost!"
"Oh dear...you wanna fight me?! This is just dreadful!" (sarcastically, of course)
"I hate hate hate hate hate hate hate hate hate hate hate hate hate hate hate hate hate hate hate hate hate you!"
"Life...Dreams...Hope...Where'd they come from? And where are they headed...? These things...I'm going to destroy!!"
"This is sickening! You sound like chapters from a self-help booklet! Prepare yourselves!"
"Nothing can beat the music of hundreds of voices screaming in unison!"
"I will hunt them down! I will destroy them all! Destroy! Destroy! Destroy!"
"I will destroy everything! I will create a monument to non-existence!"
"Run, run, or you'll be well done!"