User blog comment:CreatorTheta/Possible theory of Weiss's Semblance and how it mixes with the Dust/@comment-3146930-20131104113810/@comment-3146930-20131104212139

According to what Pyrrha said, everyone with a soul has an Aura. However obviously not everyone in the world is trying to become a Hunter or some other combat-related profession. Pyrrha also said with the right training, you could learn to use it more effectively. This would mean that there are trainers, teachers, or guides that teach people how to use Aura.

The same could be true of a person's Semblance. Maybe the instructor discovers a person's Semblance somehow and trains them in how to use it. What I find strange is that Weiss, the hard-core note taker, didn't know what a Semblance was until Pyrrha explained it. It is possible that maybe because of her (possibly) sheltered life, she didn't know that not everyone can make Glyphs using Dust and just assumed other people hadn't trained that way. Maybe she just didn't know that everyone has unique powers, as she is also surprised by Ruby's speed and Pyrrha's magnetism.