Wait, I think i am wrong about this.
I think that The Fredbear Plush is both. Reactive and Observed. Where one day he is reactive, and then the other could be observed.
“What did he do this time? He locked you in your room again. Don’t be scared. I am here with you.”
It's interesting how The Fredbear Plush acts on a reactive information, not omnipresent observation. Which is a obviously trope, but it's interesting that he isn't always there.