Not really. While there might be a few 'Buffy Suicide Fanfic' out there, they are not common. The Buffyverse is known for its action, magic, and complex characters. Most fanfic writers are interested in expanding on these elements rather than delving into such a distressing and controversial topic. Also, many fanfic communities have rules against writing about topics like suicide in a way that could be harmful or triggering.
Buffy began as a television show and only later was adapted into comics. So, it wasn't a comic initially. The TV series gained popularity before the comic adaptations came out.
Buffy's relationship with Spike in the comics varies. Sometimes they have significant interactions and may even be romantically involved, but it's not a constant throughout all the comic series.
Yes, they are. The graphic novels do a good job of introducing new fans to the Buffy universe. They have all the elements that made the TV show popular, like the strong characters, the fight against vampires and demons, and the drama. Even if you haven't watched the show, you can easily get into the stories.
It varies from comic to comic. Sometimes they have a romantic connection, while in others, their relationship is more complicated or not existent at all.
Buffy does have some science fiction aspects. The show incorporates magic, demons, and other fantastical elements that are common in the genre. However, it also blends in elements of drama and horror.