Kefka vs Leo???

The thing is Kefka as a character will have an HP equal to the average of the party. So one alternative is creating a character with an event prior to the battle and use this character instead. You could also give many lives to Kefka via the monster script.

According to Nattak, that cannot be done. However, I haven't tried that myself. I don't like usME...it always corrupts my rom. Forgive me lord madsiur, for I'm a usME noob.