Astro Novalite is a "Main Toon" character characterized as a calm, introverted figure. He is visually designed with a teal crescent moon for a head, featuring a black right side with a white star-shaped eye. He wears a 3-piece striped blue pajama set, a cape with a star pattern on the inside, and a dangling sleeping cap with a pom-pom. He also wears slippers designed to look like a star. A key design aspect is his four arms, which are usually obscured by a cornflower blanket wrapped around his torso, revealing only his legs. Astro is generally quiet and avoids taking the lead in conversations, preferring peace and quiet. He can sometimes come off as standoffish, but he is genuinely caring and willing to lend a "helping hand (or four)". He has the ability to peer into and manipulate dreams, which he uses to aid his friends by gifting them specific dreams. He treats Guest with more energy than his usual sleepiness and secretly has a crush on Guest.