Mirrors in Welcome to Night Vale

Mentions of Mirrors
My mom seems really proud of me too. She hid from me for three days, the longest ever! And she’s covered all the mirrors in my house. I’m not sure why, but I think it must be because of pride. Being proud does all sorts of things to a...person.
Interning is going great! Mom is gone. Leonard is super nice to me. My brother is gone too. Family, right? I think I’m learning a lot at the station. All of the mirrors in my house are uncovered now. Not sure who did that. I’m standing in front of the hall mirror right now. Am I changed? Am I becoming an adult? I look more grown, I think, more professional.
That flickering movement is everywhere now. Especially looking in this mirror. I see the flickering movement and I know. I know it.

I think the radio station is fun. I think the radio station is hidden. I think the radio station is like a dark planet, lit by no sun. I think, therefore I soon won’t be.

I’m looking in a mirror. The mirror is not covered. The flickering movement is just behind me. I-

[He screams. There is gurgling. A body falls to the floor. Tape hiss continues. The tape shuts off. End teenage voice]
No matter! I’m taking the tape, just now and I’m [GRUNTS] crushing it into little pieces. None of us have to think about it again. I’ll just double check that the mirror in the station bathroom is covered as usual and then that will be that. Done. Forgotten.

From "33 - Cassette"

All of "171 - Go to the Mirror?" is about mirrors.