Pidgeon headcanon!
Pidge is a aro/ace trans demigirl. She used identify as a trans girl hence -"matt, dont call me pidge" "sorry... Katie."
But later identifying as demigirl. She started using the name pidge (her birth name) again and actually liked it better than katie now. Plus "pidge" was gender neutral.
She begrudgingly cut her hair, thinking it would erase her femininity but she began to like it and accepted the fact that she was a trans girl but not extremely feminine and that was okay. She liked the term demigirl. That was her.