There are many possibilities. For instance, the female reader could be a dancer who is hired to perform in the same place as Alice Angel. They start to communicate through their art forms. Alice Angel might be envious of the reader's freedom at first but then realizes they can learn from each other. Or the reader could be a technician who is tasked with fixing Alice Angel's glitches. As she works on Alice, they start to develop a bond. Another idea is that the female reader is a psychic who can sense Alice Angel's emotions and pain, and she tries to heal Alice's troubled soul.
Perhaps in the fanfic, Alice Angel has lost her memory. Henry, who has some knowledge about the strange place they are in, tries to help her regain her memories. Along the way, they discover secrets about the place and their own pasts. Their relationship grows as they rely on each other for support, and Alice Angel starts to see Henry in a new light, different from how she might have perceived others before.
One plot idea could be that the reader, an angel, is sent on a mission to redeem Lucifer. Along the way, they have many intense philosophical debates about good and evil, which gradually lead to an unexpected bond between them.
Maybe the angel reader has the power to heal, and one of the lost boys gets injured. The angel saves his life, which then binds them in an unexpected way. The other lost boys are both grateful and a bit jealous. This leads to a series of events where the angel has to navigate the complex relationships among the lost boys while also hiding their true identity from the outside world.
One idea could be a story where Alice and Jasper travel back in time to their human days and have to deal with their past selves. Another could be a scenario where they get separated during a battle with a new group of vampires and have to find their way back to each other. Maybe a story where they discover a new power together that only they can use as a couple.
One idea could be that Alice returns to Wonderland as an adult and finds it has changed completely. The once friendly characters are now in a state of chaos due to a new dark force. Another could be a story where Wonderland is connected to our world in a more secretive way, and Alice has to keep the balance between the two. Or perhaps a fanfiction where Alice teams up with the Cheshire Cat to solve a mystery that involves all the Wonderland characters and their forgotten pasts.
One common theme is mystery. Since Alice Angel has an air of mystery around her in the original context, fanfictions often explore this further in relation to the reader. Another theme is a sense of discovery, as the reader discovers more about Alice Angel and her world.
You could write a fanfiction where the Angel Blade has a mind of its own. It communicates with the wielder in a mysterious way, guiding them towards a greater purpose. The story could then revolve around the wielder trying to understand the blade's intentions, while also dealing with external conflicts like battles against dark forces and political intrigue within their own group.
A great plot for a Clockwork Angel fanfiction could be a time - travel story. Tessa or one of the other characters could accidentally travel back in time to a crucial moment in Shadowhunter history. They would then have to navigate this new - old world without changing the course of history too much. Another idea is to focus on the love triangle between Tessa, Will, and Jem from a different perspective. Maybe from the point of view of a bystander who can see things the main characters can't. And a fanfiction that dives deeper into the world of the automatons and how they were created and what their ultimate purpose might be could also be really engaging.
One idea could be that Naruto is somehow transported to the world of Alice Twilight. He might meet Alice and they team up to face a common threat that exists in both their worlds, like a powerful dark magic user who is trying to spread chaos. Naruto could use his ninja skills and Alice could use her Twilight powers.
One idea could be that Agent Alice and Peter are on a mission to save a world from an unknown virus. They have to work together, combining Alice's intelligence and Peter's physical strength. Along the way, they face various challenges and start to develop a deep friendship.