Ok my turn:

Job: Dark Knight
Role: DPS
Base Class: Marauder
Secondary Class: Lancer
Tertiary: Pugilist

And for the skills:
lvl30: Blood stance: Change all increase enmity moves to equivalent HP restore moves. Increase damage dealt by 10%
lvl35: Absorption: Increase damage dealt, taken, and healed by 10% for 20 seconds, off GCD
lvl40: Decapitate: Base 100 potency, potency increases (up to a maximum of 450 at 0.1% hp) as HP decreases, GCD
lvl45: Bleed: Base potency 300, potency decreases as foe has more HP (up to a minimum of 10 potency at 100% hp) , dot potency 10, dot potency increases as foe has less hp (up to a maximum of 200 potency at 1% hp), Off GCD
lvl50: Red eye: Base potency 150 AOE, potency increases as HP decreases(up to a maximum of 300 at 0.1% HP), places dot on self potency 30, GCD

I.e. Class has moves that increase in damage as hp decreases, but also has moves to recover HP from dangerous levels

Job: Ranger
Role: DPS
Base Class: Archer
Secondary Class: Lancer
Tertiary: Pugilist
(i.e. change the classes for bard)
And for the skills:
lvl30: Far shot: 200 potency, off GCD
lvl35: Tactical Dodge: 150 potency, can only be used in range of 10 yalms to 20 yalms, knockback self 10 yalms, GCD
lvl40: Smokescreen: Decrease enmity in nearby foes, inflict blind (AOE), off GCD
lvl45: Camouflage: Increase Evasion and Dexterity by 20%, off GCD
lvl50: Head Shot: 400 potency, off GCD
Also can equip arrow heads as secondary weapon, with effects such as 10% poision, slow, crit rate, paralyze, etc

Job: Bard
Role: DPS
Base Class: Archer
Secondary Class: Conjurer
Tertiary: Arcanist

And for the skills:
lvl30: Mages ballad
lvl35: Army's Paeon
lvl40: Foe Requiem
lvl45: Rain of Death (the old Rain of death...)
lvl50: Battle voice (less cooldown time)