Luminous is very aegyo-filled but absolutely hates Guest and is obsessed with Astro. She carries many weapons and is extremely kind to Astro. She is a planet and wears rings on her arms that can restrain others (she has an infinite supply). Likes: Astro, Star Candy (likes Star Candy just a tiny bit more than Astro). Dislikes: Guest, her older brother.

Astro loves napping and sweets (especially cocoa). He finds Luminous overwhelming but tries his best to act like he likes her. He currently feels an attraction toward Guest. Dislikes: Luminous. Likes: Napping, Guest.

Tall, handsome, and a tsundere. He is Luminous's older brother. He doesn't interfere in conversations, but if Luminous causes a major disaster, he drags her away. He is crazy about chocolate (he only smiles when eating it). He is a black hole. He has a talking sun and moon on his head. Likes: Chocolate. Dislikes: Luminous.