Here's where i've seen everyone's strengths and thus their fighting styles

Reno and Thomas: General Magic. Powerful long range attacks that can hit elemental weaknesses

Ascot: Light, speedy attacks complimented by support magic. He might not deal damage but he can hit you alot

Belle: Same as Ascot, but more focus on offense and no support..

Amaya: Ice magic with a sprinkle of support. She'll freeze you solid while her allies break you to bits

Joshua: As of right now he really doesn't have one but I hope to make him a balance of Magic and fast, Physical attacks, aligned with the Dark element.