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KD
Since: May, 2009
2022-10-13 18:33:00
Seems like it just goes under Backstory. From the article:
- Backstory (or lack thereof) often serves as Fanfic Fuel; many Fanfics exist to explore backstory.
Violet19999
Since: Oct, 2022
MetaFour
MOD
(Old Master)
2022-10-14 01:51:34
Also see Pseudo-Canonical Fic for the broad category of fanfics that aim to be as consistent with the original canon as possible.

Sorry if this isn’t a trope or poorly described, but is there a trope for a fanfic that explores the backstory of one specific character or group of characters?