I'd never had much interest in "fanfic" except for one or two transient bursts of interest. I tended to regard fanfic as something that made the most sense when applied to mediocre entertainments that left good characters (or good ideas for characters) stranded in poor-quality scripts. Back when the show was new, for example, I read some fanfic for the Steven Moffat "Sherlock" because I rather liked the portrayals of Sherlock and John while desperately wanting them to inhabit better stories than Moffat could put them in.
#Undertale did something different to me. Right then, that night, I started plotting my own stories.