Cassidy

*cough cough* Andrew in the Fazbear frights au *cough cough*

I don't think it's supposed to be easy to tell, the voice actor of Cassidy in UCN was specifically made to speak so it'd be hard to tell, besides that the character Cassidy from the novels is a girl and the animatronics refer to Golden Freddy as he

The suit is a male and the soul can still be female

I know, I believe Cassidy is an overpowered little girl

I actually made a video about this.
Idk if Cassidys a boy or a girl tbh

Good question, It might be two different cassidys that are being shown but idk.
I just gave a random idea fyi- plz don't attack me for it-

Ik it sounds stupid but its just an idea-