Auras

Also known as an "energy pattern". It is like a fingerprint, and everyone's is unique. Energy leaves behind trails and marks for limited amounts of time before fading. A trained AO can recognize energy patterns for not only being near them (preventing being spied or sneaked up on) but to recognize who they come from. Masking your energy pattern isn't difficult but you can't hold it back for long.

The Aura and You
Auras give off intense impressions. Consider it the "first impression", actually. Even regular humans have it. Your biggest trait about you stands out, and compels others to behave in certain ways around you. Of course for Anomalies, this is even more intense.

For example, when meeting an outer human who's aura is intimidating, you might automatically fear them or wish to obey them as you are scared for yourself.

Anomalies can control their aura, but it can flare if it isn't kept under control.

Do pay attention.

Fun Fact!
A normal human will find it overwhelming to be surrounded by a group of anomalies, since their auras are more powerful than a regular humans. They might become nauseated or agitated or frightened. This is also a phenomenon that happens with humans in crowds with anxiety or packed concerts. Auras can cause anxiety, even if they're not from an anomaly.