It's been forever since I've seen Season Four, but I'll see if I can help at least a little.
At that point, Willow's still pretty much geeky Wicca girl. She doesn't really start using the magic for darker purposes until somewhere between the middle and end of Season Five.
For the first half of Season Four, Giles was sort of lost. He wasn't technically Buffy's Watcher anymore, the library was gone, and his "kids" had all gone away to college. As the season went by, though, he realized that they still needed him... just in a different way. Season Four ended with the four original Scoobies (Giles, Buffy, Willow, and Xander) really getting back to their roots, and it was revealed just how much they depended on each other. Anya, Tara, and Riley weren't full-fledged members of the "team" -- that honor stayed with the Core Four.
As for Spike, he spent most of Season Four living in Giles's bathroom and Xander's basement. By the end of the season, though, he had found his crypt and was working on getting it set up like he wanted it. He and Harmony were sorta off-again and on-again at that point, if I remember correctly.
And, of course, Dawn appeared sometime between the two seasons -- most likely closer to the end of Season Four than the beginning of Season Five.
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At that point, Willow's still pretty much geeky Wicca girl. She doesn't really start using the magic for darker purposes until somewhere between the middle and end of Season Five.
For the first half of Season Four, Giles was sort of lost. He wasn't technically Buffy's Watcher anymore, the library was gone, and his "kids" had all gone away to college. As the season went by, though, he realized that they still needed him... just in a different way. Season Four ended with the four original Scoobies (Giles, Buffy, Willow, and Xander) really getting back to their roots, and it was revealed just how much they depended on each other. Anya, Tara, and Riley weren't full-fledged members of the "team" -- that honor stayed with the Core Four.
As for Spike, he spent most of Season Four living in Giles's bathroom and Xander's basement. By the end of the season, though, he had found his crypt and was working on getting it set up like he wanted it. He and Harmony were sorta off-again and on-again at that point, if I remember correctly.
And, of course, Dawn appeared sometime between the two seasons -- most likely closer to the end of Season Four than the beginning of Season Five.