What are the anime characters in the Doomsday Transformation Valkyrie?

Doomsday Transformation: Valkyrie was an online literary work. There was no clear answer to the anime characters involved because this work was not officially authorized or recognized, nor was it widely adapted into an anime work. However, some anime characters that appear in works with the theme of the end of the world can be used as a reference, such as What Were You Doing at the End of the World? Are you free? Can you come and save me?" Bubu, Cory, Walnut, Qianxun, etc. in " Tokyo Ghoul ";; Jin Muyan, Lelouch, Lelouch Langlei, etc.; Allen, the giant hunter team in " Attack on the Giant ".