It is possible to pull off combo moves with your characters. Prophecy uses the power of your characters to damage all enemies. Blue Rogues summons your active crew to aid in the battle. Some characters head, some deal damage. My suggested crew deals three times as much as it heals.
Every character has access to spells.
They each have to learn the spells on their own. At the end of the battle, they receive an amount of Magic Points. Each character needs different amounts of magic points to learn their spells. Fina, for example, learns her spells faster than everybody else and Drachma learns them really slowly. For each of the six elements there are six spells.