Have been playing a lot of ZZZ and I think the main headcanon I’ve made is Nicole being older than she says she is.
Mostly coming from how Anby didn’t have a last name when she met her so Nicole gave Anby her last name and in a sense taking care and mothering all of the Cunning Hares even if they get rowdy with their antics especially Billy.
So she’s a boss and like an older sister figure that’s almost motherly in the way she’s willing to go full stops to take care of Anby and the others especially since I’m pretty she herself was an orphan but just a thought.