So for pride you say being to able to shift the user's appearance to appear as what someone else idolizes, so basically being able to turn into their idol/role model, like a specific famous person, family member, or other specific people. I like it, maybe for a draw-back the longer the user uses the ability, the more they lose the memory of what they originally looked like, and if they use it for say, over a day, they completely lose memory of what their real self looked like.

For gluttony, yeah this sin is pretty straight forward. I mean the only drawback I can think of is that if he consumes too much at once, he just vomits up everything he eats and can't eat anything else for a while, and that draw-back has some advantages too, being able to basically puke up a mass of objects at people attacking you. Still, for a straight forward sin, the draw-back shouldn't be to big either, in my opinion at least.

Anyways, so we have one entry for pride and one for gluttony, so need at least 4 more submissions (1 for each of the other sins)