have the girls activate like normal but with green eyes this meaning their in safe mode

the girls might even try to flirt with the mc

and you could give the crocy red eyes as shes in security mode

Lol, it's actually kinda fun if you think about it

it could also be nice to see them having a routine 

they all could walk around in safe mode but if its their night they turn hostile

the dev could make 1 night per charcter where that girl turns hostile

then 1-2 alt nights 

1 where half the girls turn hostile

and then a nightmare mission where all of them turn hostile

but i do think if the girls have the same bug the normal fnaf has where they walk around at night you should keep them on the map in safe mode