Ghostfreak's powers are composed of several aspects of traditional ghosts from myths and lore, such as hovering and phasing through solid matter, making his intangibility a powerful defense as well as a means of infiltrating high-security locations.

He has been shown to be capable of making other objects or people intangible as well through physical contact.

Ghostfreak can fly, has a movable eye, can become invisible, and can survive in space. Ghostfreak is able to possess the bodies of his enemies and control their movements, allowing him to freely slam them against walls or hit themselves. He can also access the abilities of other beings that possess superpowers. In the case of Darkstar, he also had access to his powers once he possessed him.

Ghostfreak can use the tentacles under his protective skin as a means of scaring his enemies into submission. However, Ghostfreak has also been seen using them to grab heavy objects, such as a bus full of people. The tentacles also appear to be resistant towards sunlight, which is shown when Ghostfreak saved the people on the bus with his tentacles without burning.

Ghostfreak's true form, without his protective skin, has telekinetic abilities, as seen in Ghost Town, when he fought against Vilgax using only his telekinetic abilities and energy beam projection. His true form also has sharp teeth and claws, as well as an inverted skull. His outer skin protects him from burning in the sunlight.
Ghostfreak is immune to Darkstar's energy absorption ability, as an Ectonurite has no life force in the conventional sense.

Ghostfreak can rotate his skull. Ghostfreak's tentacles are strong enough to lift a bus full of people, as revealed in Bengeance is Mine. Ghostfreak can alter his shape by making himself into a smoking form.