I'd like to see GAM (Gambler).
Whip usage, some quick and notch fighting style with some swings and scapes, like RDM. I can see GAM using some mechanics that reduce enemies defenses by luck.
Like a gauge that once it's fully charged can debuff by 25/50/75% of their defenses for a couple seconds, but only if they that get the skill right.
Even more, the skills can increase the Gauge once they Crit!