This is my favorite question.
I think Nik would be an enhancer (pure strength), will would be a manipulator (bullets that could trace true motives in a person), murdoch would be a conjurer (reveals the truth to himself, obscures the truth from others), cliff would be a conjurer (a labyrinth of tea plants with a beast within its walls), sam would be a specialist (being in infinite multiple places at once, but being able to physically and mentally feel every death).