- Harry Potter
- Buffy the Vampire Slayer
- Avatar: the Last Airbender
I’m sure there are more so people should help me expand this list. These are BIG and recent fandoms, and they were not mostly white male slash, but driven by big rival het ships (and, in the case of Buffy, not a small amount of femslash). So even the statement that “most” fandoms are “mostly” slash is an incorrect assumption that arises from the relative insularity of slash fandom.
Additional suggestions: Star Wars, Disney, Doctor Who.