A great plotline in Arrow fanfiction could be the introduction of a new group of anti - heroes. They initially clash with Oliver and his team but then end up joining forces to take on a bigger threat. This could lead to some really interesting character development and power dynamics. There could also be a story where Oliver loses his memory and has to rediscover who he is while still being hunted by his enemies. Or a plot where Felicity creates a new technology that gives the team an edge in combat, but it also comes with some unforeseen risks.
Well, perhaps a plotline could involve the Arrow teaching some of the Avengers his unique combat techniques. For example, showing Hawkeye some new archery tricks. And in return, the Avengers introduce him to their advanced technology for upgrading his arrows.
One interesting plotline could be the Flash and Arrow teaming up to face a common enemy that has powers beyond their usual foes. For example, a meta - human with the ability to manipulate time, which forces them to use their combined skills of speed and archery in creative ways.
Another plotline might involve the character's struggle to recover from the knee injury. It could show their determination to not let the injury stop them from their quest or daily life, with them having to adapt to their new physical limitations.
One possible plotline could be Naruto being transported to the Arrow universe and attracting the attention of various female characters. Maybe he uses his ninja skills to help them in their battles against villains in Star City, and in the process, romantic interests start to develop.
One possible plotline could be that Felicity discovers she's pregnant just as a major new threat emerges in Star City. This creates a dilemma for her as she wants to help the team but also protect her unborn child.
One interesting Arrow fanfiction could be about Oliver Queen having to face an enemy from a parallel universe. This would bring in new and exciting elements to the story as he has to adapt to different fighting styles and powers.
One possible plotline could be that the 'darhkness' is a new super - villain or an ancient evil that has been awakened. The Arrow team has to find a way to defeat it using their skills and newfound powers or technology.
One interesting story could be about the adventures of the main character in a new and dangerous land. They might face various challenges and make new allies.
There might be a story where the Black Arrow teams up with an unlikely ally. For example, a young thief who has a heart of gold. Together, they take on a powerful and corrupt lord in the region.
There are fanfictions that explore Green Arrow's early days. For example, a story might detail how he first learned archery and what inspired him to become a vigilante. It could include his training in the forest, his encounters with his first mentor, and how he crafted his first set of arrows.