Astro is a light blue crescent waning moon. The left side of his face is black with a white star eye. He wears a light purple-ish blue blanket wrapped around his torso, obscuring his arms to the point where they are barely visible as faint furrows in the blanket. However, his blanket is still short enough that it reveals his legs that are the same color as the moon side of his face. He wears a dangling sleeping cap the same color as the stripe on his blanket, with a light blue trim and pom pom.