I dropped Skull.
When I got Fox, I immediate migrated to the katana he had, plus the Ice spells were fun.
My primary line up with Joker, Panther, Fox, and Queen.
After awhile, I realized the pros and cons to each person, so my final lineup consisted of:
Joker, Panther, Skull, Noir/Mona.
Joker was split into uber damage, and support healer
Panther is the hardest hitting Mage,
Skull is the hardest hitting Physical
Noire's Heat Raiser for boss fights
and Mona is the best Healer for standard mob trash grind.
I wanted to use Fox and Queen more, but they do not do well end game, as they don't actually specialize in damage like the rest can, so the last of passive buffs really do hurt them in the long run.
I min-maxed my party quite a bit and was focused on taking down the optional fight to get the Omni orb.
(edited by Joker)