An investigator belonging to the Galactic Federation Police Earth Branch, Records Division. The sole "Space Sheriff Gavan" of Multi-Earth Α0073. He possesses a hot-blooded sense of justice and a straightforward personality, often blunt about his anger and emotions. He joined the Galactic Federation Police under the influence of his mentor, but after being exposed to a special Emorgie during an incident, he gained the ability to travel across Cosmo Layers. Based in the sidelined "Records Division," he catches negative Emorgie waves occurring on other multi-Earths and deploys to the scene across dimensions.

Chief of the Galactic Federation Police Records Division. Reiji's classmate from the police academy, whom Reiji calls "Colonel." Always calm and soft-spoken, he is a mediator who skillfully manages the eccentric members of the Galactic Federation Police. Since he cannot leave the ship once they cross Cosmo Layers, he provides command, analysis, and support from inside the Cosmo Gavarion, backing Reiji's investigations from the rear.

An autonomous AI assistant for the Records Division, developed by Colonel Date. An artificial Emorgie human with emotions, designed by applying the organizational structure of Emorgie. Usually possesses a physical body like a human, but by activating "Laser Conversion" via an accessory device on her left ear, she can transform her body into particles, enabling effective teleportation and infiltration. She accompanies investigations on multi-Earths and can freely change her appearance and outfit by manipulating her particle composition. A highly expressive character who shouts "Gavan-tastic!" when excited. Female.

The sole "Space Sheriff Gavan" of Multi-Earth Λ8018. Captain of the Special Task Force of the Galactic Federation Police Public Security Headquarters. A taciturn warrior who values a code of conduct similar to a samurai, rarely showing emotion. Not human, but an artificial lifeform created for war, equipped with self-repair functions and having lived for thousands of years. While traveling across many stars, he developed a strong interest in human "emotions" and independently learned how to control and mimic facial expressions. However, due to his construction, he lacks the function to "shed tears" and cannot cry. Because of this, he harbors a secret longing for the act of crying itself.

Chief of the Galactic Federation Police Public Security Headquarters of Multi-Earth Λ8018. Setsuna's direct superior. A highly capable commander with a calm demeanor and great courage, possessing the judgment to look at both the field and the organization. She is deeply trusted by her subordinates and holds Setsuna's abilities and loyalty in high regard. Female.

The sole "Space Sheriff Gavan" of Multi-Earth Ι5109. Member of the Galactic Federation Police Forensics Division. Possesses outstanding reasoning and analytical skills, is well-versed in expert knowledge regarding Emorgie, and can communicate with Emorgia. She has a geeky disposition regarding science and tends to dive headfirst into subjects of interest, exclaiming "This is beyond my imagination!" Called "Kiki" by her partner Koto, she solves numerous cases while being led by the action-oriented Koto. Female.

An investigator belonging to the Galactic Federation Police Forensics Division of Multi-Earth Ι5109. Partner to Gavan Luminous. Resourceful and proactive, she is skilled in weapon handling and martial arts. She excels in frontline judgment and responsiveness, handling on-site responses single-handedly. She has been best friends with Kiki Iwaiki since high school and has long served as the straight man to the eccentric Kiki. Called "Koto" by Kiki, they are a stable duo who complement each other: the theoretical Kiki and the practical Koto. Female.

A ninja investigator of the Kazenami style belonging to the Galactic Federation Police Interstellar Intelligence Department. The sole "Space Sheriff Gavan" of Multi-Earth Ζ2066. Under the command of Commander Darres, he is engaged in a top-secret investigation to track the source of frequent Emorgia incidents on Earth-Ζ and destroy the mastermind behind the distribution. Hailing from a ninjutsu school called the Kazenami style, he is a master who manipulates those techniques at will. Using the Kazenami Style: Dimension Crossing, he can perform dimensional transcendence similar to Gavan Infinity. He does not underestimate fear and never lets his guard down, giving him a quiet and elusive personality, but he shows interest in Gavans existing on other multi-Earths and attempts to recruit them as allies.

A man who was once called "Gavan Destiny" and was Reiji's predecessor as Gavan on Α0073. He fell from grace to become Death Gavan, scattering Nega-Emorgia and causing crimes across all dimensions.