Dark Avatar

The Dark Avatar was an entity of Unalaq and Vaatu and becomes the most dangerous enemy Carter has ever or will ever fought but has became a new form for Carter in order to bring balance between Light and Dark.

Appearance
He is completely black with red markings across his body.

Personality
He is shown to be cruel and cold as he taunted to Carter that Raava was gone and could not be found.

Powers, Skills & Abilities
Unlike the Avatar, the Dark Avatar did not have the ability to bend all four bending arts, since Unalaq could only waterbend prior to his fusion with Vaatu, unlike Wan, who went to the lion turtles with Raava and received all four elements.

Despite this limitation, the Dark Avatar's bending potential could still be significantly augmented by a variation of the Avatar State, in which Vaatu provided Unalaq an energy surge which allowed him to accomplish great feats of waterbending, such as creating large waves capable of dispersing several battleships.

In this state, Unalaq's eyes glowed orange-red, as opposed to the white glow visible when the Avatar enters the Avatar State.

Due to being fully aware of his spiritual capabilities, Unalaq had full control over the Dark Avatar State and was able to trigger the mechanism whenever he found it appropriate to use.

After vanquishing Raava, the Dark Avatar underwent a physical transformation, becoming significantly larger in size, with powers and attributes present from both Unalaq and Vaatu.

Being that the two were so closely connected in this form, this extreme fusion is termed "UnaVaatu".

Despite his humanoid appearance, also bore resemblance to Vaatu's spiritual form, retaining tentacle-like appendages and a triangular projection from his forehead.

Unalaq's waterbending was far more powerful in this form, with UnaVaatu able to create a giant wave proportionate to his size that easily defeated the United Forces fleet.

UnaVaatu was also able to spiritbend on a larger scale, which he used against Carter's astral projection.

Furthermore, UnaVaatu possessed several abilities that the Avatar has never demonstrated, including tendrils and energy beams.

These were all skills that Vaatu had prior to becoming fused with a human host.

Weapons
None.

Family
None.

Voice Actor
Jonathan Adams/Adrian LaTourelle (Fusion).