Unverseds

The Unverseds (アンヴァース, Anvāsu), meaning "those who were not well-versed in their own existences", are the main enemies and are considered "the opposite of human life" and grow from the negative emotions produced when Vanitas was created from Ventus. By all accounts, the Unverseds are extensions of Vanitas himself, allowing him to control their actions.

Chronologically, the Unverseds are either the first or second enemy referenced during Deep Dive, as they are the second race to manifest, but the first to attack the Realm of Light.

"It happened when you and I were split into two. The negativity took shape as these monsters. They are what I feel—a horde of fledgling emotions under my control."
 * —Vanitas, explaining the existence of the Unverseds to Ventus.

Anatomy and Design
Several varieties of Unverseds appear over the course. Emotion was a key component in their conception and design. Thus they are seen with smiling, angry, and crying "faces", referring to the shape of their red eyes, which all Unverseds share. They lack a direct link to the heart, but are beings that represent emotions in hearts. The emblem most Unverseds are christened with is also meant to represent a heart that expresses emotion. Unlike Heartless and Nobody bosses (whom are enveloped in darkness and light respectively, when defeated), the Unversed bosses are consumed in a dark flame when vanquished.