Buffy dies at the end because the master (BIG VAMP) drowns her but then Xander and Angel find her. Xander does mouth to mouth and brings her back to life where she goes and kills the master.
Darla also dies in season 1, (she is killed by Angel). She is brought back by Wolfram and Hart in "Angel."
Season 5 "The Gift" is the last time she dies but her friends resurrect her, but other than that Buffy never dies and stays dead
Well can tell u who dies in each season season one: Buffy dies but is bought back season two: angel has to die but he comes back in season 3 angel kills jenny calender while he was evil season 3:idk if anyone dies i dont rember season 4: i dont think anyone dies season 5: joyce summer dies season 6: tara dies season 7 anyanka dies
She wasn't ever a robot, really. Spike had gotten a 'Buffy-bot' to help him with his 'sexual desires' while Buffy wasn't with him. When Buffy dies, sacrificing herself, they use they same Buffy-bot to help around Sunnydale.
gorge dies
"Seeing Red," episode 19 of season six.
Season 5! because that's when Glory shows up looking for the key which is Dawn and when Buffy dies for the second time
The body
Yes, Buffy dies twice in Buffy the Vampire Slayer. She dies first in season one when the master drinks from her and she drowns, but Xander manages to bring her back. Then she dies once more in the season five finale when she sacrifices herself for the benefit of the world and for her little sister, the original sacrifice. At the beginning of season six, Willow finds a special way to bring her back again but it has a great price.
In Buffy the Vampire Slayer she doesn't end up with anyone. However in the final Series of Angel she gets with the Immortal. Later, in the season eight comic of Buffy the Vampire Slayer, we find out that it is possibly one of the two alias that is publicly hooking up with the immortal, thereby nulifying the possibility that we actually see Buffy in this episode of Angel.
The body
its a slow process...there was never an episode where willow was just kinda 'I'm gay' but the episode where she comes out to Buffy is season 4 episode 19 "New Moon Rising" the first episode you see Tara, which may be the episode where willow "goes gay" is season 4 episode 10 "Hush" you don't see willow's first gay kiss, however, until season 5 episode 16 "The Body"
Marissa Cooper dies at the end of season 3 and she is the main character too, but also Seth's grandpa - Caleb Nichol - dies of a heart attack.