So I have half-elf druid of Gozreh - deity with double nature as a goddess of beach fun and god of storm's wrath. I promised my players bonus traits for character history and knacks. What I came up for her is this:
(mixed races only, follower of deity with multiple natures)
Once a day, you can assume look of either of your parents races. This does not change your physical or mental traits, your dexterity, strength, senses or anything, just your body look. Your characteristic features remain unchanged. You get +5 trait bonus on disguise tests to pretend you are pure blood of chosen race, and +1 trait bonus on disguise tests against people looking specifically for you. You can keep this form as long as you want, or revert to your original form. This is 0-level spell-like divine transmutation.
Reasoning: +1 trait bonus on two skills (like Partial Protege) or +2 to two skills, but with limited application (Perfectionist's brew) are known. This trait would affect only one skill, with +1 or +5 (but limited) bonus, and would be subject to detect magic etc.
I want to be sure - is it fair? And if not, how to tweak it?