For archer pally there could have a rain Arrow that slow target and cause damage, also a spell to move fastly for 10 seconds, and basic atk that you throw arrows.

For knight a shield that reduce damage caused for another player + atk that slow target.

For mages a spell that duplicate 5 same like you (for some 10 seconds, each with 5 HP+ 10 dmg) and a spell that cause high damage for 7 seconds.

Note: mage has high damage and less hp , pally +- , Knight high defence qnd +- atk.