So what happened to her background? I'm comparing Piper and Curie and Cait.
Cait has all kinds of interesting background. She definitely has an attitude. Her personal quests require you to take Vault 95, which is a freaking bear to take when you're only level 17. You have to perform a procedure on her. And afterwards her opinion changes on some things, like you taking drugs and such. She's a new person with a new view on life.
Curie goes through even a bigger transformation when having to transfer 'her' into a Synth body. Though I must admit it felt like something major was cut out concerning the 'caretaker' of the body. She's like, "well I didn't know the Synth, it's costing me caps to keep the body alive, I'm thinking of unplugging her anyway, so sure just take it". I mean, there had to be something more there that just got cut or something. The whole caretaker thing was pointless. But, Curie of course has to go through a lot in changing bodies and the new sensations she now has and such and she actually comes up with new healing procedure.
Piper. Well Piper has a sister that may or may not end up like her. And that's ok. The end. I mean seriously, what the hell happened there?