for weapons and magic

Balthier and Fran----- bow
Basch and Vaan----- swords, daggers, spears, poles, or axes
Ashe and Penelo----- katanas, mace, staff, or rod


everyone except Basch should know all types of magic, even though you wont use black magic. Basch should only know white magic, and dont set it as a priority in your gambits.