RPG, many characters join, but you just use the first few the whole time

Kimahri's great to get Steal & Use so I can have a second character with access to those, without needing to disrupt any of my other characters' natural progressions. Then send him down whichever path (I think I did Yuna's last time for another white mage). He's fine to use for the main story, as is Lulu since she's your main black mage. Lulu also gets a deathtouch weapon before anyone else, which is nice (and humorous watching her attack do something). I never got far enough into the post game to get to the point where I didn't need certain characters.