#but also he's a shithead whose mother repeatedly reinforced the idea that being a shithead

[whetstonefires]

You know, I've been thinking about it, and it is absolutely essential to the narrative that Jiang Cheng is a dick and a trash fire. (Affectionate.)

Like, first of all, if he was a sainted little angel of a shidi the way Jiang Yanli is a shijie, Wei Wuxian's choices would become obvious, sort of impersonal, and boring.

Sure, lots of people wouldn't tear themselves apart for such a person in such a scenario, but they're not the protagonists of novels, are they; in a book you have to justify not doing that. So white lotus Jiang Cheng is off the table.

Jiang Cheng who isn't fragile-and-insecure but also stubborn-as-hell and violently reactive also won't wash.

If he wasn't the kind of person who sincerely tries to die under these circumstances, Wei Wuxian would have had the option of loyally supporting him in a less self-destructive way; if he was someone who could be trusted to handle the revelation without suffering a ruinous fracture of identity, Wei Wuxian wouldn't have been forced to distance himself after the war, because he could have come clean.

If Jiang Cheng wasn't the kind of person who centers on his own pride and hurt feelings and lashes out about it, it would be very hard to set up the lategame scenario where they're 'enemies' in a real, meaningful way, despite still loving each other and Wei Wuxian never wishing Jiang Cheng any ill. Even with Jiang Yanli's death.

And I mean, you could get most of the plot without doing this interesting thematic examination of the classic 'bond between martial brothers severed by one going to the dark side' trope, but I'd argue you'd lose an enormous chunk of the story.

And without Jiang Cheng's weaknesses, Wei Wuxian's motives don't cohere. His weaknesses form the foundation of at least two of the backstory's major turning points.

There's the tantalizing possibility that Wei Wuxian wouldn't have done it, if Jiang Cheng hadn't strangled him while blaming him for everything.

Probably he would have, all else being equal! But neither we nor Jiang Cheng can be sure.

Jiang Cheng sucking a lot, and knowing his own flaws perfectly well without that granting him the ability to do much about them, is heavily load-bearing. Which gives him such a fantastic implied point of view!