Semblance

Semblance is an innate, aura-based power that every person has the ability to use, but a semblance will only form if the user "needs" it

(Information)
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.

Those that use Semblance are able to manipulate certain physical phenomena according to the nature of their power. Some have Semblances that depend on external factors.

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.

semblances tend to “match” hunters’ fighting styles if they were discovered before or in the early stages of training as the hunter will form their style around it