Semblance is the manifestation of one's innate and personal power as an ability unique to each individual, with the effects varying greatly from user to user. The nature of one's Semblance is noted as representing an aspect of their character. However, a person's Semblance can be similar to the Semblances of their parents or other family members. For instance, the Frost family Semblance, resistance against cold, is completely hereditary. According to the old Winter Maiden, a Semblance that remains exactly the same between family members is something very rare.
Those that use Semblance are able to manipulate certain physical phenomena according to the nature of their power. Overuse of one's Semblance for prolonged periods may adversely affect its user at certain times. It seems that emotional turmoil or stress can affect one's use of Semblance. Interestingly enough, it would seem that a user can still use their Semblance even though their Aura has been depleted.