Walburga Black in fanfiction is such a fascinating character to explore because she's this looming, almost mythic figure in canon—strict, pure-blood obsessed, and utterly ruthless. Many writers dive into her backstory, painting her as a product of the Black family's toxic ideology, sometimes even showing glimpses of vulnerability beneath that iron exterior. I've read fics where she's a tragic figure, trapped by her upbringing, and others where she's downright terrifying, a villain who makes Umbridge look tame.
One trend I love is when authors explore her relationship with Sirius. Some depict her as outright abusive, while others add nuance, showing a twisted kind of love beneath the cruelty. There's also the occasional dark comedy take where she’s this over-the-top aristocratic nightmare, screaming about blood traitors while her portrait loses its mind. It’s wild how much range fanfiction gives her—way more than the books ever did.