The Chaos Dimension is where all kinds of Chaos Dark and Chaos Light characters live.
The Chaos Dimension was created when dark and light celestial bodies merged and exploded, forming a land mass that began to fill with characters. The dimension eventually grew with natural and artificial land. The chaos dark live in one section, while the chaos light live in the other. Most characters were born in the Chaos Dimension, like Mana the Hedgehog. But others like Kayce the Fox immigrated from other dimensions.