Being an energy being of the Astral World, Astral has a transparent blue body with green markings and blue gems all over his body. He has blue hair that curls up in a Mohawk and pointed ears, which are pierced with dangling earrings. Astral also has heterochromic eyes, the left eye being luminous gold and the right a clear white. Astral's body is also very thin. In the English dub, Astral's lower body is sometimes blurred off to remove nudity implications.
When falling under the influence of Chaos, Astral develops a darker color scheme on the left half of his body, has a black outline on his outer body and emits a red aura.