Ginga Arashiyama is a supporting character introduced in episode 17 of the series. An aspiring idol, he often behaves as if he is on stage during battles, describing situations with stage terminology and galaxy-themed language. He maintains a generally cheerful and excitable demeanor, treating fellow drivers with friendliness while staying fair-minded and serious about his responsibilities, never permitting distractions to interfere with his mission. This approach helped him swiftly settle early disputes with another driver, Shin.

Though still early in his idol career, he has attracted a growing fanbase, especially among women and young girls who enthusiastically respond to his signature wink. His appeal even converted one of his superiors at the Shinkansen Ultra Evolution Institute, who had previously supported a different idol. He typically remains humble despite this popularity.

Discussions about trains excite him so much that he sometimes slips into his native Kansai dialect. His design and thematic elements are deeply connected to the cosmos, incorporating shiny galaxies and comets.

He operates the Shinkalion Z 500 Kodama and favors the 323 Osaka Loop Line as its Zailiner enhancement. His machine is equipped with a large weapon known as the Signal Knife, which grows larger when combined with the Zailiner to become the Osaka Loop Line Signal Knife. This combined form also boasts a sizable shield on its left arm, fashioned from nearly the entire front and roof of the train, resulting in a fashionably asymmetrical design.

His name derives from Japanese railways: Ginga comes from the West Express Ginga, a limited express service run by JR West, and Arashiyama references Arashiyama Station, served by either the Hankyu Arashiyama Line or the Randen Arashiyama Line.

In the original Japanese version, he is voiced by a male actor, while both the Cantonese and Taiwanese dubs feature female voice actors for the character.