The Plasmatons are basically a protein agglomeration, random particles of protoplasm assembled from the atmosphere and bonded by psychic energy. The essential protoplasm can take any shape, although as they are created by psychokinetic power, this shape is determined by the mind of the person who has brought them into being.
For the person creating the Plasmatons, there is a limited amount of both power and raw material available, so the number that can be summoned is finite. In order to create more, the protoplasm must be drawn from currently-existing Plasmatons.
Plasmatons materialize out of thin air, and can surround things and transport them elsewhere. They are accompanied by a cloud of grey smoke that expands to reveal them, and then shrinks to nothing when they disappear. They also have the ability to exude, or appear as, a bubbly coating which encases people unharmed until the Plasmaton material is drawn elsewhere.
Plasmatons are harmless by nature, but the energy that composes them can be drawn from deeper sources to form more dangerous creatures, like a two-headed hydra. It is not clear what abilities these creatures have, but they - as all Plasmatons - will disappear if the power source fuelling their creation is cut off or destroyed.