My characters' least healthy aspects.

Shen Qingqiu: The fact he doesn't really truly consider anything Real. Like, it's real, but, there's a part of him that disassociates everything because it's a book.

Also, he doesn't really listen. He makes decisions and assumptions without really listening to what is being told and thinking about how others feel.

And how does he make up for doing that? By then just denying himself things he wants.

and giving in

He also runs away from his problems

and tries to ignore them as if they will eventually just go away

Wei Wuxian: He internalizes everything.

He puts on a fake smile to reassure others, even when he's dying inside.

He won't ask for help

He thinks he can do it all alone.

Really his whole story is about, no, he can't do it alone, he needs someone there with him, to help support him.