Zs'Skayr is shown to be a careful and brilliant master planner, able to come up with highly resourceful, cunning, and complex schemes and plans, through which he aims to gain immense power for himself and domination over entire worlds. Anyone whom he considers as worthless is either tormented for his amusement or is manipulated and later destroyed once their usefulness has ended. Zs'Skayr has a twisted, arrogant, power-hungry and sadistic personality.

Zs'Skayr (taking control over Ghostfreak) after escaping the Omnitrix in the Original Series Personality The facet joints on his back are larger and more curved, the skin on his arms now hangs down, much like sleeves, and his teeth now look more like human incisors than fangs. He now has two eyes, one on his head and one on his chest, and his skin is now modified to look like the hood and cloak of a stereotypical Grim Reaper, complete with a scythe. In Omniverse, Zs'Skayr has turned his head right-side up. His spine was sticking out of his back, his tail was fully exposed with black and white stripes and he had spikes on his elbows with whiter, less sharp rows of teeth. In Alien Force, Zs'Skayr's body was purple/blue and he had whitish-grey nails. This included the original Omnitrix symbol peeking out of his skin on his lower left chest too, which was not present on his true form. Just after escaping the Omnitrix, Zs'Skayr looked exactly like 10-year-old Ghostfreak. He could also become smoke-like by deforming his bodily shape into wisps of grey, somewhat transparent flames. He had long black nails, and there were some tears in his skin, revealing black and white striped tentacles underneath. His head resembled a grey-brown skull turned upside-down, which had uneven teeth, black lips, and one purple eye. It was gray-purple and had black lines running across his chest.

In the Original Series, Zs'Skayr had a ghost-like body.

Ben 10 omniverse female characters