In some Wishverse fanfics, there could be a plotline about the Scooby Gang trying to reverse the wishes that created the Wishverse. They might have to face their darkest selves or deal with versions of themselves that are very different. There could also be a plot where a new villain emerges specifically because of the instability of the Wishverse, and the gang has to figure out how to defeat this new threat while also fixing the Wishverse.
Buffy herself is often a very popular character in Wishverse fanfic. Writers like to explore different versions of her, like a more jaded Buffy in a darker Wishverse. Spike is also popular as his complex character can be taken in many new directions in the alternate reality. And Willow, given her powerful magic, can have some really interesting storylines in the Wishverse.
For a Buffy the Vampire Slayer OC fanfic, an interesting OC could be a time - traveler. This character could come from the future to prevent a major catastrophe in the Buffyverse. They might have knowledge of future events and technologies that could either help or hinder Buffy's fight against evil. Another option is an OC who is an artist. But their art has a magical quality to it. When they draw something, it can come to life or have an effect on the real world. For example, if they draw a cage, it can trap a vampire. And an OC who is a shapeshifter, able to take on the forms of various mythical creatures to aid in battles.
In some Buffy and Angel Wishverse fanfics, the plot could be about the consequences of wishes on the overall balance of good and evil. A wish could tip the scales in favor of evil, and Buffy and Angel have to find a way to set things right. This might involve teaming up with unlikely allies or facing off against new and more powerful villains. The Wishverse also allows for exploring different character arcs. Characters who were minor in the original series might have a much more prominent role in the fanfic due to the changes brought about by wishes.
Topics like Buffy's battles against new and powerful vampires or demons. For example, exploring how she would deal with a vampire that has a unique power that she has never faced before.
One unique concept is time - travel fanfics. For example, some fics send Buffy back in time to the days when the first Slayer was alive. It changes the whole dynamic as she has to deal with the ancient vampire - slaying traditions and different versions of vampires.
A really good starting point could be 'Once More, with Feeling' by various authors. This fanfic collection is inspired by the musical episode of the show. It has a lot of creativity in terms of how the characters are developed further in the musical - themed stories. There are different takes on the relationships and the overall Buffy - verse, which makes it an interesting read.
One interesting aspect of 'Buffy the Vampire Slayer Earshot' fanfic could be the exploration of Buffy's character in a more in - depth way. In the original episode, we see her struggle with her slayer duties and personal relationships. Fanfic might expand on how she deals with the knowledge she gains in 'Earshot', like her thoughts on the secrets she overheard. It could also delve into her relationships with her friends, perhaps showing a different side of her interactions with Xander, Willow or Giles.
Well, there's a fanfiction called 'Mind's Eye Manipulation'. It's about a demon that has the ability to not only control Buffy's mind but also manipulate her perception of reality. Then there's 'Controlled Chaos' where an experiment gone wrong leads to Buffy being mind - controlled and causing all sorts of mayhem in Sunnydale. And 'The Puppet Slayer' is a story in which a mysterious force turns Buffy into a puppet, literally controlling her every move.
One idea could be a crossover where Naruto's world is invaded by vampires. Buffy could travel to the Naruto universe to help fight them using her slaying skills and knowledge, while Naruto and his friends learn about the existence of vampires.
There might be a fanfiction where Dawn travels back in time and meets a younger version of Buffy. This could lead to some really interesting interactions and changes in the timeline.