I thought about this for a really long time before I realized that the answer was incredibly obvious. I did not want to get through this meme without writing about one character who I think exemplifies the anti-feminist tendencies of this show, at least from a female perspective.
I honestly believe that Faith is the most complex and interesting character in Buffy. Sadly, her story arc doesn't get nearly as much time as it should on this show. Faith as a person is a perfectly feminist character, but once again it's about framing. So let's take a look.
Faith shows up at the beginning of Season 3 as the Slayer that was called after Kendra was killed. She is instantly everything Buffy is not--dark-colored clothing to Buffy's cutesy little outfits, dark hair to Buffy's innocent blonde, and sexually promiscuous where Buffy has at this point been put in her place for having a sense of sexuality. Even more, Faith ENJOYS slaying in a way that Buffy also does but refuses to admit it. Faith is the Whore to Buffy's Madonna, so naturally she has to turn evil--her aggression and sexuality have to turn into something bad.
It's hinted that Faith has kind of a bad past, not knowing her father and having an abusive, alcoholic mother. So, naturally, she dealt with this through being delinquent...and highly sexual. Sex is not exactly a good thing on Buffy.
So Faith goes to work for the Mayor--she was SO DESPERATE for that replacement father figure that she needed to go be evil about it--and, long story short, ends up in a coma. When she wakes up she finds a spell to take over Buffy's body, because she obviously should so desperately WANT to be the good girl. But let's save that for a minute.
When Faith does come back in the Season 4 episode "This Year's Girl", she finds Buffy and talks to her. Faith points out that Buffy tried to kill her for Angel, over a guy that Buffy had seen as "the love of her life." But when Faith came back, Angel was long gone and Buffy was with Riley, an entirely different guy. Then Willow calls Faith a bitch a few times, which is always charming.
In Season 3, the turning point of Faith into "evil" territory is when she accidentally kills a man that she thought was a vampire. The whole Scooby Gang frets over her, pointing out that she must feel completely different now that she's taken a human life. And it's clear that Faith does change--she's more lost than ever but deal with it in an unhealthy way. In this she quickly becomes the Bad Guy. Something that was clearly going to happen from Day 1 of her appearance because the good, sweet, nearly-virginal heroine of the show was put off by her aggressive, frank, sexual ways.
In "This Year's Girl", Faith takes over Buffy's body. In the second part of the two-part episode, "Who Are You", we see her imitate Buffy in private, mocking Buffy's sense of right and wrong. She even does it to Spike here (keep in mind, the dialogue is tagged as "Faith" but it's Faith in Buffy's body):
Gah! You know why I really hate
I'm a stuck up tight-ass with no
sense of fun?
Wuh-yeah, that… covers a lot of it…
'Cause I could do anything I want
and instead I just pout and whine
and feel the burden of slayerness? I
mean, I could be rich, I could be
famous, I could have anything.
(her tone becomes
Even you, Spike. I could ride you at
a gallop till your legs buckled and
your eyes rolled up, I've got muscles
you've never even dreamed of, I could
squeeze you till you popped like warm
champagne and you'd beg me to hurt
you just a little bit more and you
know why I don't?
Because it's wrong.
What do you want to do with this
you been itching to try out? Am I a