G is a female assassin and a character from the Galaxy Express 999 series.
G is an assassin working for the Cleanliness Committee of the Kingdom of Repentance where she is tasked with executing anyone who could potentially damage the image and reputation of the planet.
Fraiya was designed and created by Shingo Araki and Shigeru Kogawa during the late 1970s. She appears in the Galaxy Express 999 series, which was created by Leiji Matsumoto, creator of the popular Captain Harlock franchise.
When the Conductor has an experience that could ruin the reputation of the Kingdom of Repentance, the Cleanliness Committee dispatches G to assassinate him. She seemingly gets the drop on him but is outfoxed and captured due to his invisibility. Under questioning she reveals the Committee's plans to the Conductor and passes out in fear after he removes his hat and "shows" his invisible head to her.
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