I'm almost finished with Homestuck (just a few hundred pages left) and I'm not looking forward to the postcanon stuff because I have heard awful things about the way Dirk (my second favorite character!) was handled in it.
I already have a sort of continuation brewing in my brain in which Dirk somehow comes across the knowledge that he's fictional and therefore he has no free will because his actions are dictated by an author and just completely crashes the fuck out over it.
Goes completely batshit insane trying to bust himself and his friends out of the shackles of fiction, trying to make any of his decisions be his own, fighting against the whims of a force he couldn't possibly hope to BEGIN to understand, and unknowingly falling into said whims every step of the way.
Maybe the epilogues and Beyond Canon will give me the spark of contempt I need to actually write this continuation once I reach them. Maybe the Meta!Dirk Crashout will be better than the BC villain arc who fucking knows.
I just like the idea of making my favorite characters go through the horrors, and what better horror for a piece of fiction as drenched in metanarrative as Homestuck than to realize you're fictional.