Annie
Dai's girlfriend, whose homeworld of Mount was annihilated by Fuuma. She requested to be assigned to Earth with Dai, with intentions of vengeance. She usually drives a yellow Mazda RX-7 FB to patrol the streets or arrive at the scene of a battle, using a Laser Shot sidearm in battle. In the Cross-Over Movie, Dai Reveals to Retsu and Den that she is In Egypt studying Archaeology. She was told by her parents that Shaider is a thief. Then her father told her to shoot him and she was shy. Her mother told her to just do as he says. She didn't kill anyway.

Kojiro Oyama
Carrying over from Sharivan and Gavan, Kojiro now runs a pet shop where owns a pig named Tonko. He doubles as a teacher, giving Dai a place to stay after learning of his past and (once again) unaware of his dual identity. He has feelings for Annie.

Yoko
Kojiro's teenage assistant, living with her father and younger brother Ryochi.

Hiroyuki, Wataru, Shin, Rumi, Mio, and Kyoko
Student of Oyama.

Warrior Shaider
An ancient warrior from the stars who drove Kubilai from Earth and demolished the Mu Empire, remaining on Earth for the rest of his days and fathering a line that presumably leads to Dai, the current Shaider. Warrior Shaider's ideals were also the foundation of the Galactic Union Patrol.

Commander Qom
He is the commander of Galactic Union Patrol and the father of Mimi.

Marin
Commander Qom's assistant.

Mimi
She is the daughter of Commander Qom, formerly Gavan's assistant and now his fiancee. She is a teacher at the Space Sheriff School. She asks Shaider to take Annie with him to Earth. After the final battle against Fuuma, she marries Gavan.

Gavan
The captain of Galactic Union Patrol. He battles Fuuma to defend the Bird Planet. After the battle against Fuuma, he announces his marriage to Mimi.

Sharivan
He is a Space Sheriff from Iga Planet and helps defend that planet from Fuuma attack.

Ullu
He has a face like a squirrel, Dai's classmate and friend who was deputized in response to Fuuma's war declaration. He was killed when Fuuma attacks his home planet during the Great Invasion.

Kitz
He has a face like a bird, Dai's classmate and friend who was deputized in response to Fuuma's war declaration. He was killed when Fuuma attacks his home planet during the Great Invasion.

Andro
Dai's classmate and friend who was deputized in response to Fuuma's war declaration. He is killed when Fuuma attacks his home planet during the Great Invasion.

Vivian
A cheery journalist from Planet Bird who, against the wishes of her father, the president, heads to Earth to write about the Space Sheriffs and the Fuuma. However, crashing into the Fuuma fortress by mistake, Vivian is used in the villains' plan to destroy the Vavilos. In the process, due to Pairpair, Vivian falls in love with Shaider to Annie's dismay.
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