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Whedon always tends to introduce characters and always seems like they weren't meant to last very long, but then end up becoming major characters. Spike was never meant to be a major character on the show, but he grew and developed. Same with Faith, she was only supposed to last a few episodes, but her character grew as the series grew. So yes, many characters when they start out seem rather expendable, but over time they develop and become more interesting. As for the sister, that was how Whedon wanted to introduce her, to the viewer she just appeared out of thin air but to the characters it was like she was always there. Good explaination or not it will make some kind of sense as season 5 goes on.
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