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It would probably be either Ascended Extra or The Bus Came Back.
From the Ascended Extra article: "This also happens somewhat regularly in Fan Fiction, often when writers feel a character has potential that wasn't fully exploited in the original source."
And if a character is Put on a Bus in the canon work and is forgotten about, then the fanfic is bringing them back for a new adventure or whatever.
Edited by KD
That would work! Thanks!
Is there a trope where the writer in fanfiction makes the forgotten characters memorable and actually enjoyable to read?