Every powerball has the same size and weight, the power they have and the capacity of their mana depends on a person's emotions, dreams and power ball's color.

Powerballs have eight colors which is:

Red - the one who possess the red ball has the power to manipulate fire

Orange - the one who possess the orange ball has the power to manipulate electricity.

Yellow - the one who possess the yellow ball has the power to manipulate objects

Green - the one who possess the green ball has the power to manipulate plants

Blue - the one who possess the blue ball has the power to manipulate water

Indigo - the one who possess the indigo ball has the power to manipulate air

Violet - the one who possess the violet ball has the power to manipulate animals

Black - the one who possess the black ball has the power to manipulate human's shadow wether dead or alive.

Like a motor, every powerball needs gas to move, their gas is their owner's dreams. Nightmares are dreams too so it counts as food for the powerball.

If the owner used it's power to it's limit they'll experience concequences such as being devoured by their powerballs and their consciousness will be gone forever as their powerball took their body and live like it's their own.