hmm I use Beowulf, Reis, and Orlandu the most.

Beowulf with double chaos sword in his Temple Knight class is awsome

Then Reis, with the right equipment she is the best black mage.. Around 24 or so magic attack so a regular fire dose something like 200 damage.

Orlandu is self explanitory.

As for everyone else, Rafa for the deep dungeon. Malak, never really found a use for him.. I think he is still in the 30's..level wise. Agrias is good just not as usefull as Orlandu. I usually get rid of Meliadul after I get her. Cloud rarely use unless I am bored. Worker 8 is great if you use him right. His long range attack on a map with a mountian is perfect. Never used the special monster. I think that is everybody.

My favorite party is all generics though.