Allies

Mimi
Mimi
She is the only daughter of Commander Qom, and Gavan's assistant. She uses a pendant which is also a visual illusion device. With her "Laser Vision," she can transform into a budgerigar to spy on the Makuu. She is in love with Gavan but would support him in any case. She leaves the Dolgiran to help her mother on Bird Planet, to return in later battles to continue helping Gavan.
Commander Qom
Commander Qom
He is the commander of Galactic Union Patrol and the father of Mimi. He lives on Planet Bird, helping Gavan by providing information and training him to beat the Makuu. He and Gavan can communicate through a giant screen on the Dolgiran.
Marin
Marin
She is Commander Qom's assistant. She was ready to save Gavan's life when he was almost killed by the poison of the Dokuja Monster. She became Gavan's second assistant in Mimi's absence.
Voicer
Voicer
Gavan's father; he was a former space sheriff of Earth, betrayed by his fellow Hunter Killer and captured by the Makuu. He was forced to build the Hoshino Space Cannon, a weapon that can destroy a planet, but he kept the blueprints a secret even after being tortured. He was saved from imprisonment by his son Gavan. He was brought back to Dolgiran but died soon after, with the secret blueprint for the cannon written on the palm of his hand.
Alan
Alan
The Space Sheriff assigned to Planet Beeze. He comes to Earth in search of a kidnapped princess from his planet. He is dressed like a cowboy and saves Gavan when San Doruba arrives on Earth.
Den Iga, Space Sheriff Sharivan
Den Iga
He is a forest patrolman descended from the Iga ninja clan who was nearly killed by Buffalo Doubler. Den is sent to Planet Bird for his injuries, eventually returning to Earth take over Gavan's position in protecting the planet as Space Sheriff Sharivan.
Kojiro Oyama
Kojiro Oyama
This is a photographer whose obsession is UFOs; he created a machine that is able to detect them. He met Gavan and from them on, the two keep crossing each other's paths. He occasionally works at the Avalon Riding Club to replace Retsu. He also befriends Wakaba and Yuuichi.
Gosuke Fuji
Gosuke Fuji
The kind grandfather and owner of the Avalon Riding Club whose greatest wish is to get his young body back. Though he feels sympathy towards Gavan (who he knows as Retsu), he is often angered about his frequent disappearances.
Wakaba and Yoichi
Wakaba and Yoichi
Gosuke's grandchildren. They both live at the Avalon Riding Club and they sometimes happen to be in the middle of the Makuu schemes. They have developed a strong friendship with Retsu and Kojiro.
Tsukiko Hoshino
She is Gavan's adopted sister and was brought up by Voicer when her parents were killed by Hunter Killer. She is a very sweet girl who assists Gavan in his missions.
Shigeru Touyama
A youth who works for the Avalon Riding Club.
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