Erie Fairweather, Or: The Mutt of Theseus
There are three Erie Fairweathers, categorically speaking
This is Erie.

"'Zank you so much misteur captain! You're 'ze best."
-Erie Fairweather, when told she would be promoted from Service Worker to Bartender.
She has memory problems, which she won't like if you point out, a go-getter attitude and an unshakable belief that in the end, Nanotrasen has her best interests at heart.
She doesn't excactly remember when she was born, but she takes the day she woke up with no memory of anything in the longue of a Central Command designated evacuation point as her birthday.
I play her very often.
This is also Erie

"It's n-not a big-g deal. Just missing my eyes. I can-n lif"
-Erie Fairweather, recently left recouperative surgery.
Even though she suffered some great wounds to herself, she's mostly the same. She still believes that NT thinks of her as anything but grist in the mill, but there's cracks. Moments where she doubts her place in NT, or worries that she isn't as useful as she can be.
I play her only every now and then, as getting into her mindset's a bit difficult.
This, too, is Erie

'Zis whole place stinks. Everything's just rotten to 'ze core. You included"
-Unknown.
A few years ago, give or take a month, a loud, outspoken lady decided that none of the endless mill of work was worth it, and ended herself with a cocktail of drugs.
Of course, when someone walks the path of death, they do not make plans for if they survive the process.
I don't think i'll ever play this version of her.
Thus, Erie Fairweather died, and Erie Fairweather lived.