Actually, Kimahri can be the best character of them all.
I gave him a strong defense and good white and black magic.
He could kill anything, it just matters how you use what you have, not what you have.
Lulu saved my ass a lot, try fighting a magic blob with Yuna or Tidus.

I gave up on the butterflies, I have never seen a game that pissed people off so much, lol.