Combos: Ninja has 3 combos.
Aeolean edge combo: 670 potency straight dps combo
Dancing Edge combo: 610 potency combo with a 10% slashing debuff & 20% healing debuff attached to it, which, despite the english description, has no positional requirement
Shadow Fang combo: 350 damage 2 step combo with an 18 second 40 potency dot.

Dragoon has 2 combos(No I don't count the RoT combo)
Full Thrust combo: 680 straight dps combo
Chaos Thrust combo: 600 potency combo, with a 10% piercing debuff and a 30 second 30 potency dot attached. Combo MUST be started from the rear in order to continue the combo.