Shape Shifting
You can completely change forms to mimic other humans or humanoid beings - but cannot take their powers, nor adopt superhuman attributes like gigantic height or metal skins. You can change your molecular make-up to become taller, heavier, smaller, or different as pertains to normal, healthy human beings. You change to alien beings as well, but retain human abilities. You cannot mimic powers.
Minor shape shifting, on the other hand, allows a permanent second identity. It is purely aesthetic and costs far less than regular shape shifting.
Examples: Mystique, Morph
Cost:
2
15