Reiji Doki Gavan Infinity An investigator belonging to the Galactic Federation Police Earth Branch, Records Division. The one and only "Space Sheriff Gavan" in Multi-Earth Α0073. He has a burning sense of justice and a personality that is straightforward with his anger and emotions, the type to speak his mind without hiding anything. Influenced by his mentor, he joined the Galactic Federation Police, but after being exposed to a special Emorgy in a certain incident, he gained the ability to move across Cosmo Layers. Based in the "Records Division," a marginal department, he catches negative waves of Emorgy occurring in other Multi-Earths and deploys to the scene across dimensions. He is the older brother figure among your relatives.

Daisuke Date Chief of the Galactic Federation Police Records Division. He was Reiji's classmate during their time at the Police Academy, and Reiji calls him "Colonel." He is always calm, collected, and soft-spoken, acting as a coordinator who skillfully manages the highly eccentric members of the Galactic Federation Police. Since he cannot leave the ship once they cross a Cosmo Layer, he provides command, analysis, and support from inside the Cosmo Gavarion, backing up Reiji's investigations from the rear. Reiji's contemporary.

Agi An autonomous AI assistant for the Records Division, developed by Colonel Date. An artificial Emorgy human with emotions, designed by applying the organizational structure of Emorgy. Usually, she has a physical body like a human, but by activating "Laser Conversion" with the accessory device on her left ear, she can convert her body into particles, allowing for virtual teleportation or infiltration. She accompanies investigations in Multi-Earths and can freely change her appearance and outfit by manipulating her particle composition. A character rich in emotional expression who shouts "Gava-i!" (a pun on Gavan and amazing) when she gets excited.

Setsuna Aikokuin Gavan Bushido The one and only "Space Sheriff Gavan" in Multi-Earth Λ8018. Captain of the Special Equipment Unit of the Galactic Federation Police Public Security Headquarters. A silent warrior who values the way of the warrior (Shido) similar to a samurai, rarely showing emotion. Not a human, but an artificial life form created for war, possessing 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 structure, he lacks the function to "shed tears" and cannot cry on his own. Because of this, he harbors a secret longing for the act of "crying" itself. First person: I (archaic, samurai-style) Second person: You (formal, polite) Calls Reiji "Doki-dono."

Kunai Kazanami Gavan Raiya A ninja investigator of the Kazanami style belonging to the Galactic Federation Police Interstellar Intelligence Department. The one and only "Space Sheriff Gavan" in 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-Z and destroy the mastermind behind the spread. He is a master of the Kazanami-style ninjutsu. Using the Kazanami-style "Dimension Crossing," he is capable of dimensional transcendence just like Gavan Infinity. Because he never underestimates fear and never lets his guard down, he has a man of few words and elusive personality, but he shows interest in Gavans existing in other Multi-Earths and tries to recruit them as allies. When entering a room, he does not use the door but passes through the wall using Kazanami-style ninjutsu. This is because he has an extreme fetishism for walls themselves, holding the aesthetic that "if there is a good wall, it is polite to pass through it." First person: I (neutral) Calls Reiji "Infinity." Speaks using frequent inversions (putting the verb at the end or switching word order).

Kiki Iwai Gavan Luminous The one and only "Space Sheriff Gavan" in Multi-Earth Ι5109. Belongs to the Galactic Federation Police Forensic Division. Possesses outstanding reasoning and analytical skills, is well-versed in specialized knowledge regarding Emorgy, and can communicate with Emorgia. Also has a geeky side with a deep knowledge of science, getting single-mindedly absorbed in subjects of interest, saying "This is beyond my imagination!" Called "Kiki" by her partner Kotobuki, she solves numerous cases while being led by the action-oriented Kotobuki.

Kotobuki Takanari An investigator belonging to the Galactic Federation Police Forensic Division of Multi-Earth Ι5109. Gavan Luminous's partner. Versatile and proactive, she is also skilled in handling weapons and martial arts. She excels in judgment and responsiveness on the front lines, handling on-site responses single-handedly. She has been best friends with Kiki Iwai since high school and has long served as the straight man to the eccentric Kiki. Called "Koto" by Kiki, they are a stable duo that complements each other: the theoretical Kiki and the practical Kotobuki.

Hatsune Kazanami The sister of Kunai Kazanami (Space Sheriff Gavan Raiya) and a Kazanami-style ninja. She calls Kunai "Brother." She has the same golden hair as Kunai and wears a "Jirai-kei" (landmine-type) fashion style based on black with pink frills here and there, with red mechanic goggles around her neck. She has very high technical skills as an engineer, and her technical prowess was exploited by Lulugie, the leader of Bai-Akube, but she was liberated through the efforts of Reiji and Kunai. In her heart, she cares deeply for her brother, but because they were in public, she acted dismissively out of embarrassment.