Femslash is universally more scarce than any other type of fic, including gen. Accordingly femslash-rich fandoms are somewhat notable as such.
Types of femslash fandom:
- Canonical f/f pairing (Bo/Lauren from Lost Girl, Callie/Arizona from Grey's Anatomy, Cosima/Delphine from Orphan Black, many others)
- Subtype: Majority-queer cast (The L Word)
- Female protagonist(s)
- One female protagonist will generally not spur a femslash fandom, because a majority of texts with a female protagonist will still show her interacting primarily with male secondary characters (too many examples to count)
- Two female protagonists (Rissoli & Isles)
- Female protagonist and best friend (Xena/Gabrielle from Xena Warrior Princess)
- Female protagonist and archnemesis ("Swan Queen" from Once Upon a Time)
- Majority female cast (Orange Is the New Black, Birds of Prey)
- M/f/f love triangle with or without the male angle (usually without due to the prevalence of monoshipping over polyshipping)
- This is difficult to pull off as usually the two female wings interact too little
- Two major female characters (supporting or in ensemble)
- Best friends (Harley/Ivy in various DC and/or Batman fandoms)
- Arch enemies
- Interacting with each other at all!
- Especially if not involved in a love triangle
- Childhood classics where girls-as-best-friends is the rule rather than the exception (Anne/Diana in Anne of the Green Gables and many others)
A sufficiently large cast, especially in book, comics or animates canons, will generally spur a profusion of minor femslash pairings between minor characters, but will usually not create an overwhelming femslash fandom, unless a pairing gains unusual momentum.