The FFXIII game has six roles, Commando (melee striker), Ravager (magic blaster), Sentinel (tank), Medic (healer), Synergist (buffer) and Saboteur (debuffer). Most of these are pretty straightforward, but I feel the Saboteur has a few interesting points. Most notably, their debuffs cause damage when they hit, and one of their spells lower the max hp of the target (Wound). What this does is it makes it feasible as a real class, able to stand on its own. The Wound mechanic should also be possible to integrate into PF with few problems.
As of yet, I am unsure of what to do with this, but I would like some thoughts on it.