Cruel and Sadistic: He enjoys manipulating others and shows a dark, remorseless attitude born from a history of loss and vengeance. Easily Bored: Like Cosmo, he grows bored easily, but instead of being bubbly or hyperactive, his boredom manifests as a dangerous, unpredictable playfulness. Arrogant Yet Self-Aware: He claims to be the strongest entity in any universe, stating he can always grow stronger or weaker. Deeply Affectionate Toward Terra: Despite his cruelty to others, he treats Terra with remarkable calm, viewing her as his "only comfort" across dimensions. Hateful of Astral Rules: He despises the rigid rules of the astrals (viewing them as "objectively stupid" for allowing people to die), which ultimately drove his descent into destroying the star beings of his origin universe.

Mischievous Trickster and Prankster: In this specific series, Lunar loves setting up wild, dramatic scenarios for Guest. He acts as a chaotic catalyst—orchestrating events like body-swapping Guest with Earth, turning them into a cat, or helping them sneak around as a Daycare Attendant. Deeply Loyal but Teasing Companion: Despite constantly teasing Guest, Lunar is fiercely protective of them. Whether he is rescuing them from a kidnapping scenario or holding a dramatic "funeral" for them, his extreme loyalty to his friends always shines through his childish exterior. Highly Vulnerable and Dramatic: While Lunar presents a very playful, bold front, he remains incredibly sensitive and susceptible to insults or rejection. He thrives entirely on Guest's validation and attention.