I'm not entirely sure specifically what 'Tarquin Hall Fantastic Fiction' is about without more context. It could be a collection of fictional works by Tarquin Hall, perhaps featuring unique and imaginative stories, characters, and settings.
The origin of Tarquin in the Vector Legion could start with him being an outcast in a world filled with chaos. Maybe he was born with unique abilities that made him both feared and desired by the Vector Legion. As he grew up, he had to face many challenges and overcame them one by one, gradually becoming an important figure in the Legion.
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.
One great ACOTAR fanfic is 'A Court of Frost and Starlight' by [author name]. It really delves into the characters' emotions and expands on the world in an interesting way. The writing style is engaging and it stays true to the essence of the original series.
I really like 'A World United'. It takes the magic systems from 'acotar' and 'throne of glass' and creates something new. The author does a great job of making the fanfiction accessible to both new fans of the series and those who are very familiar with them. It has a great balance of action, romance, and mystery.
Rhysand is also a main character. He has a mysterious and alluring personality. His relationship with Feyre is a significant part of the stories. There's also Tamlin, who has his own role to play in the complex web of relationships in the 'acotar short stories'. Each character brings their own unique traits and story arcs to the short stories, making the overall narrative rich and engaging.
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.
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.
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.