One idea could be that the main character starts seeing the ghosts of the vampires' past victims within the Twilight world. These ghosts could be trying to warn the character about some hidden danger related to the vampire clans. Another could be a haunted location in Forks, like an old mansion, that has a connection to the werewolves' history, and the characters have to uncover the mystery.
Maybe the fanfiction could explore the idea of a haunted dreamscape. The characters, while asleep, enter a twilight - like realm that is haunted by their own fears and insecurities manifested as strange entities. For example, Bella could be haunted by the fear of losing Edward in this dream world, and she has to face these apparitions to find her way back to reality.
One idea could be exploring a different origin for the vampires in the Twilight universe within the fanfiction. Maybe they were created as a result of a scientific experiment gone wrong instead of the traditional vampire lore.
One idea could be that the 'inside man' is a vampire who has infiltrated the human world in the Twilight universe for a secret mission. Maybe he's trying to find a way to end the conflict between vampires and werewolves without the knowledge of either side.
One interesting plot idea could be exploring how different characters adapt to the post - apocalyptic world in new and unexpected ways. For example, a character who was once a timid office worker becomes a fearless scavenger.
A third idea is to cross it with a post - apocalyptic world. The haunted mansion becomes a refuge in a desolate world. However, it has its own set of challenges as the ghosts and spirits within the mansion are not used to the new outside threats. The survivors from the apocalypse have to team up with the mansion's spectral inhabitants to defend against new, more dangerous threats.
A possible plot is that the control panel in Riley's mind gets a malfunction, and the emotions have to work together in a completely new way. They might have to swap their usual functions, so Sadness has to take on the role of Joy for a while. This could lead to some really strange behaviors from Riley on the outside. Also, what if an outside force, like a dream character, tries to invade the inside world of Riley's emotions and disrupt their harmony?
A plot could involve a new vampire in the Twilight universe who is ashamed of their transformation and uses a mask to try and fit into human society again. They struggle with their new instincts while trying to keep their identity a secret. Along the way, they meet other characters from the Twilight series and their story unfolds in a way that challenges the norms of the original story.
One idea could be a new vampire character being reborn in the Twilight universe with a special power, like the ability to control the weather. This would create a whole new dynamic as they interact with the Cullens and other vampires.
One idea could be exploring a new magical creature in the Twilight universe. For example, a magical being that can control time and how it affects the relationships between vampires, werewolves and humans. Another plot could involve a character from the Twilight world getting lost in a different magical realm and having to find their way back, all while facing new and strange challenges.
One plot idea could be a hockey player who discovers he has a special power during a twilight game, like being able to skate at super - speed. Another could be a love story between a hockey fan and a player, set against the backdrop of twilight - filled evenings at the rink. Maybe a story about a hockey team's struggle during the twilight of their careers, with an old - timer coming out of retirement to save the day.
One idea could be exploring the origin of the psychic powers in the twilight world. Maybe there was an ancient event that triggered it.