Confusing - shouldn't GlaDOS resemble ?
Possibly? (Disclaimer: I've never played Portal, the piece is based off of what the friend described to me, so feel free to tell me if I'm wrong.)
From what I understood, GLaDOS is a computer in-game and doesn't really have an established human form, but some parts of the Portal fandom like to depict an alternate universe where GLaDOS is human or has an android body, for shipping and fanart purposes. And in those communities, she usually has white hair and clothes. Whereas in-game Chell's the brunette with the tank top and orange pants.