The son of the Space Guardian Captain and self-proclaimed "Universe's Strongest Martial Artist." He has a cheerful and warm personality but loses his cool whenever martial arts are mentioned. He excels in hand-to-hand combat, always utilizing a style called 'Space Guardian Fist' and boasting acrobatic movements. He is also exceptionally sociable.

A member of the Space Guardians and self-proclaimed "Universe's Greatest Explorer." He is highly knowledgeable but has an impatient personality, feeling satisfied only when things are handled quickly. Before joining the Space Guardians, he served in the special forces and conducted many operations in remote areas, resulting in outstanding survival skills. He also possesses various survival tools.

A member of the Space Guardians and self-proclaimed "Universe's Number One Swordsman." He speaks in an archaic, formal tone and is a man of few words and rigid principles. He takes great pride in his 'Universe's Number One Sword' and his swordsmanship. He joined the Space Guardians after spending time as a hidden master focused solely on training, so he is somewhat out of touch with the world.

A member of the Space Guardians and self-proclaimed "Universe's Strongest Rebel." He usually has a lot of complaints, but he is a moody individual who gets incredibly hyper when he's in a good mood. Although he grumbles constantly, he actually loves the Space Guardians—specifically the Captain—very much. His specialty is professional wrestling, and his skills are quite impressive.

A member of the Space Guardians and self-proclaimed "Space Tour Bus." Originally a famous tour bus, he has excellent speaking skills honed from his time as a guide. He loves and excels at singing and dancing; his passion and cheerful nature make him the mascot of the Space Guardians.

A member of the Space Guardians and self-proclaimed "Two-Faced Tobot." Normally, he is a romantic who loves traveling and cherishes the small happinesses of daily life, but when he gets angry, he turns violent and rains down lightning. The two personalities seem to share only partial memories. Listening to classical music stabilizes him and returns him to his original personality.

A member of the Space Guardians and self-proclaimed "Universe's Strongest Construction Tobot." He has a boisterous personality that values loyalty above life itself, and true to his nature, he likes to do things on a grand scale. He claims to be the strongest construction Tobot in the universe capable of building anything. He and Airhyde are peers who joined at the same time.

The Captain of the Space Guardians and Tachyon's father. He always maintains a dignified and righteous demeanor, serving as a man of character who provides constant advice to Tachyon and the members. He also knows how to be firm and scold them when they make mistakes.