Maybe it's because I found Chrono Cross to be so darn easy, but I rarely used certain characters due to their base stats - and rarely was it for innate elements. I normally chose characters based on their badassery-appeal. So Serge/Lynx, Norris, Grobyc, Glenn, Zappa, Fargo, Karsh, etc. normally made up my main party. Poshul made it in simply because s/he was recruitable so early on and his/her dialogue was so hilarious. And apparently I favored male characters (so sexist).
Turnip also snuck in from time to time, because I loved his Frog-like demeanor.
Korcha, meanwhile, never made it into my party. The Lost Boy reject was simply only good for his boat, and that was only half the time (the other half of the time was because of Macha).
(The hardest part about Chrono Cross was the fact that the steal commands could only be used once battle, which made stealing annoying at times. Of course, there were ways to reset elements, but...)