Another concept could be a crossover fanfic focused on the villains. Maeve from TOG and Amarantha from ACOTAR could form an alliance. Maeve wants power over all the kingdoms in TOG and Amarantha wants to rule over Prythian in ACOTAR. They could start to manipulate the events in both worlds to their advantage. The heroes from both series would then have to find a way to communicate and work together to stop this evil alliance, which would involve characters like Dorian from TOG and Tamlin from ACOTAR having to put aside their own issues and join forces.
One idea could be to have the characters from 'Throne of Glass' (TOG) and 'A Court of Thorns and Roses' (ACOTAR) meet in a magical realm created by a powerful ancient artifact. For example, Aelin from TOG could be on a quest to find a way to defeat a new, powerful enemy and accidentally stumbles into the world of ACOTAR. There, she meets Feyre and they initially have a bit of a clash due to their different upbringings and leadership styles, but then realize they can work together to solve a problem that threatens both of their worlds.
When writing an ACOTAR and TOG crossover fanfic, character development is key. You can't just throw the characters together without considering how they will grow and change in this new situation. For instance, if you pair up Chaol from TOG with Lucien from ACOTAR, think about how their different backgrounds and experiences will influence their relationship. Maybe Chaol's loyalty to his kingdom will be challenged by Lucien's more fluid view of loyalty among the fae. Also, don't be afraid to experiment with the magic systems. Try to find unique ways for the characters to use their combined powers. This will make your fanfic more engaging and original.
Good fanfic writing for a TOG and ACOTAR crossover requires a deep understanding of the source materials. Research the lore, the politics, and the relationships in both series. For the plot, think of something that challenges the characters from both worlds. A good way is to introduce a new, powerful enemy that neither world has faced before. In terms of character development, let the characters grow and change as a result of their interactions. For example, if Rowan from TOG meets Azriel from ACOTAR, they could learn from each other's combat skills and ways of thinking. Also, pay attention to the pacing of your story. Don't rush the important moments and build up the tension gradually.
Perhaps a crossover where the magic systems cross over. The valg from 'tog' could somehow seep into the world of 'acotar' and the characters from 'acotar' have to learn about the valg and how to combat it using the knowledge that Aelin and her crew have from 'tog'. This could lead to some really interesting battles and alliances.
First, re - read both series to get a firm grasp on the characters, their personalities, and the worlds they inhabit. Then, decide on a central plot point that would bring the two worlds together. It could be as simple as a portal opening between the two realms. Next, choose which characters from each series will be your main focus. For example, you might want to start with Feyre and Celaena as they are strong female leads.
One idea could be a story where the three characters are on a dangerous quest together and their relationship deepens during the journey. They might start off as just comrades but gradually develop romantic feelings for each other.
One idea could be a story where Nyx discovers a hidden power within himself. He might start having strange dreams that lead him to an ancient, forgotten part of the ACOTAR world. There, he meets a mysterious being who teaches him how to control this new power. This could be a coming - of - age type of fanfic for Nyx.
First, really understand Nyx as a character. Read all the source material about him carefully. Then, come up with an interesting plot. It could be something that hasn't been explored much in the original works. For example, Nyx's adventures outside of his home court.
Lots of possibilities! Maybe there could have been new plot twists or expanded backstories for the characters. Or, it could have delved deeper into the world-building and introduced new locations and creatures.
A possible fanfic could involve a fusion of the Force and chakra. Vader discovers the existence of chakra in the Naruto world and tries to combine it with the Force for his own purposes. Naruto and his allies must stop him while also being intrigued by the similarities and differences between the two powers.
Maybe in the fanfic, Batman's rogues gallery somehow teams up with some of the Avengers' villains. This forces Batman and the Avengers to work together. Batman could introduce his unique gadgets and combat style to the Avengers, while they could show him their superpowers up close. For example, Iron Man could be intrigued by Batman's utility belt and try to create his own version of some of the gadgets.