One interesting plotline could be about the characters' journey to discover the true meaning of love in a post - apocalyptic world. Maybe they find that love can exist even without all the trappings of modern society.
One common plotline is Regulus joining the fight against Voldemort after faking his death. He uses his knowledge of the Death Eaters to help the Order of the Phoenix. Another is his relationship with Sirius. They get a chance to reconcile and work together.
One possible plotline could be Kushina teaching Naruto about the Uzumaki clan's secrets. Since she was an Uzumaki, she could pass on unique jutsu and knowledge that no one else in the village might know. For example, she could teach him advanced sealing techniques. Another plotline could be Kushina's influence on Naruto's relationship with the other villagers. Her presence might have changed how some of the villagers who were once cold to Naruto would now interact with him. Also, Kushina could be involved in the political affairs of the village, using her wisdom and strength to help Konoha face external threats more effectively.
Often, in these fanfictions, Pyrrha comes back and has to deal with the aftermath of her 'death'. She might have to regain the trust of her friends who thought she was gone. There are also plotlines where she returns with new powers or abilities. For instance, she could have gained powers from the place she was 'preserved' in while she was 'dead'. Some stories also explore her relationship with Jaune again, now that she's alive, and how they pick up where they left off or start anew.
One common plotline is the resurrection of dead characters. If Naruto is dead in the fanfiction, there could be a quest to bring him back. Another is alternate timelines where Naruto's life - or death - changes the course of the entire ninja world. For instance, if he dies early, the Akatsuki might achieve their goals more easily.
In some 'love in the loud house fanfiction', there could be a plot where a character has a long - distance relationship with someone they met while on a trip. They have to overcome the challenges of being far apart, like different time zones and missing each other, but their love for each other helps them stay strong.
Perhaps there's a plot where Xena has an accidental love for a character from a different realm. She then has to navigate the cultural differences and the potential danger this new relationship brings to both her world and the other realm.
One possible plotline could be them teaming up against a common enemy and during the process, their feelings for each other start to grow deeper. They might have to save each other from dangerous situations, which strengthens their bond.
One possible plotline could be Harry realizing his feelings for Tom while they are forced to work together on a difficult magical task. Another could be Tom's internal struggle between his dark ambitions and his growing love for Harry. A third might be a scenario where they are transported to an alternate dimension and have to rely on each other to get back, during which their love develops.
Well, sometimes in 'love and obsession twilight fanfiction', there could be a plot where a secondary character is secretly in love with one of the main characters, like Jacob, but their love turns into an unhealthy obsession. This could lead to them trying to break up Bella and Edward out of that obsession, creating a lot of drama and conflict within the fanfiction world.
One possible plotline could be Spike and Fluttershy going on adventures together in the forest. They might discover new magical creatures and in the process, their bond deepens. Another could be them facing a misunderstanding in Ponyville that makes them realize how much they truly care for each other.