A woman from the long destroyed planet Filament.
The Woman from Filament, as the name suggests, grew up on Filament before it was destroyed. Before her untimely death, she and her son vowed to work hard and save up enough money to buy mechanical bodies for themselves.
The Woman from Filament is a character in the Galaxy Express 999 series, which was created by Leiji Matsumoto, who is popular for the Captain Harlock franchise and its related series. She makes her first appearance in Episode #30 "The Ghost World Filament". In the anime series, her design and creation are credited to Shingo Araki and Shigeru Kogawa respectively.
While traveling to the bathroom, Tetsuro approaches a train car that it is filled with the mysterious figures that he saw before. As he tries to back away, the figures call out to him and drag him into the car. A green hooded woman, the woman from Filament, approaches him and asks him if he is traveling alone. Tetsuro tells her that he is traveling with Maetel and the woman responds saying that she must ask Maetel if she will give Tetsuro to him. Tetsuro says that Maetel will definitely say no but the woman insists on following him back to his train car. Once there, the woman refuses to accept Maetel's decision to not give Tetsuro away and seems contempt with with using brute force to take him. Meanwhile, the computers of the GE999 have noticed the sudden influx of new passengers and alerts the Galaxy Railways Space Defense Force. The SDF arrives to save the day but is quickly gunned down and forced to retreat. With no defenses or way to battle against the woman, Tetsuro is forced to go with the woman into a blinding light.
Once there, Tetsuro is surrounded by other mysterious figures. The woman tells him that they are spirits of the people who died when Filament was destroyed. The woman then calls out to her son and tells him to enter Tetsuro's body so that he may have a physical form and receive a mechanical body. The boy is hesitant to do so and eventually refuses, saying that Tetsuro has the dreams and hopes that he had while alive. The woman and her son return Tetsuro to the GE999 and apologize to Maetel and Tetsuro. Afterwards, they leave the GE999 and return to the blinding light in space.