Jobs and gigs have attributes associated with them, while only jobs have perks. Each attribute defines a specialization within the job's overall playstyle. A perk is the same as an attribute, but characters only have access to their job's perk, not their gig's perk.
Perks bestow a constant effect on the character. For instance, the Brawler's Critical Eye increases his critical hit rate.
Each perk and attribute is associated with a set of skills. You can increase and decrease their values in safe areas (no permanent decision), and their skills' effectiveness with scale with their attributes.
Perks are activated at _ready or job change onto their owner.