How would you feel about a girl whose skin could change colour?

To start with she wouldn't be able to control this ability, and it would change based on her emotional state, but over time she could learn to blend into her surroundings or even gain resistance to elemental damages based off of the colour she became. The downside would be her emotional control, with her having to keep herself focused in order to use her powers, and any sort of emotional distress would make them go haywire.