I've always considered the Joker to be impossibly lame. His cookie-cutter 'chaotic evil' persona bores me to tears, and the fact that the character has not developed in any way over the course of several decades doesn't help his cause. The Killing Joke was too small of a step in the right direction and arrived many years too late to make much of an impact. I like characters with complex motivations. "Because he's crazy" is a poor motivation. From what I can gather, the Joker was more well-written when his name was Kefka Palazzo. I haven't played Final Fantasy VI to confirm or deny what I've been told, but I'll take my friends on faith.