Perhaps the Terminator, in the middle of the love story, suddenly starts to receive new commands from the future that conflict with its new - found love. It has to choose between following the orders that are hard - wired into its system or defying them for the sake of the human it loves. This creates a huge dilemma for the Terminator and also adds a lot of suspense to the fanfic.
One interesting plot twist could be that the Terminator was actually sent back in time not just for its original mission, but also to find true love, which was a hidden part of its programming all along.
Well, imagine this. Brick and Blossom seem to be in a perfect relationship. But then it's revealed that Blossom was created by an evil scientist as a way to get close to Brick and destroy the superhero team he's part of. However, Blossom has real feelings for Brick and has to decide whether to follow her original mission or stay true to her love for Brick. This would create a lot of drama and tension in the story.
One plot twist could be that the girl in the fanfic, who is in love with Austin, suddenly discovers that Austin has a secret twin brother. And she gets confused about her feelings as the twin brother also shows interest in her.
The plot might involve a female terminator and a male human. The terminator is initially on a mission, but as she spends time with the man, she begins to experience emotions. They face many challenges together, like other terminators sent to stop their relationship because it goes against the rules of the future world.
One interesting plot twist could be that just as Phineas and Isabella are about to confess their love, an old friend from Isabella's past returns. This friend has a secret crush on Isabella and tries to come between them. Another twist might be that Phineas suddenly loses his memory of his relationship with Isabella. Isabella has to work hard to make him fall in love with her all over again. It makes for a very emotional and engaging story.
One possible plot twist could be that Castiel kidnapped the character not out of malice but to protect them from a greater threat that the other characters are unaware of. For example, there might be a powerful and hidden enemy that has targeted this particular character, and Castiel believes that by taking them away, he can keep them safe.
In a post - apocalyptic world, a female resistance fighter finds a damaged Terminator. Instead of destroying it, she begins to repair it. As she works on it, she starts to see it not just as a machine but as a being with a certain charm. They go through many battles together, and gradually, an unexpected love blossoms between them.
In one plot twist, Arcanine is revealed to be under the control of an evil force all along. Ninetales has to fight against its friend to break the spell. And in the process, Ninetales discovers that the only way to save Arcanine is to sacrifice its own most powerful ability, leading to a heart - wrenching decision for Ninetales.
One plot twist could be that Sharkboy turns out to be from a future where Lavagirl has become an evil dictator. He travels back in time to stop her from turning bad. This completely flips their relationship dynamic and adds a whole new layer of complexity to the story.
A great plot twist could be that Lucoa is actually related to one of the tailed beasts in the Naruto world. Maybe she has some ancient connection that no one knew about. This would completely change the dynamics of their relationship and the story.
One interesting plot twist could be that the Red Queen is actually being controlled by an unseen force. It adds a new layer of mystery to her actions.