https://www.vice.com/en_us/article/k78j49/how-911-became-fan-fiction-canon

Every fictional character you can think of has experienced 9/11 in fanfiction.

A Clone Wars veteran with two lightsabers is on United Airlines Flight 93 and prevents it from crashing. Ron and Hermione get caught up in the chaos as the towers fall. Buffy the Vampire Slayer and her friends watch the attacks unfold on TV from Sunnydale. We have spent 20 years trying to process what happened on 9/11 and its fallout, and that messy process can be tracked through the countless, sad, disturbing, and sometimes very funny fanfiction left across the internet.