Perhaps an ancient evil entity that was once sealed away but is now breaking free. It wants to destroy all the good in both of their worlds, and Feyre and Aelin are the only ones who can stop it. The entity would be extremely powerful, with abilities that can counter both Feyre's and Aelin's powers to some extent.
One interesting plot could be that Feyre and Aelin team up to face a common enemy that threatens both of their worlds. They combine their unique powers and skills, like Feyre's ability to shapeshift and Aelin's fire - magic, to defeat the foe.
The theme of redemption can also be present. Maybe one of them has a past they're not proud of, and their meeting with the other becomes a turning point in their journey towards redemption. Their interaction during the meeting and afterwards can be a catalyst for positive change. For instance, Rowan might have been a bit of a loner or had a troubled past, but meeting Aelin gives him a new sense of purpose and a chance to be part of something bigger.
One great 'Rowan meets Aelin fanfiction' is 'The Meeting of Souls'. It beautifully captures their first encounter and the initial sparks between them. The author does an amazing job of describing their emotions and the magical setting.
One great 'Feyre and Rhysand fanfiction' is 'A Court of Dreams and Shadows'. It delves deeper into their relationship, exploring new adventures and emotional moments that the original series might not have fully covered.
One great Rhysand and Feyre fanfiction is 'A Court of Dreams'. It beautifully expands on their relationship and the world they live in. The author does an amazing job of delving deeper into their emotions and the challenges they face together. It has some really heart - warming scenes that make you fall in love with their story all over again.
Rowan could be one of the most interesting. His loyalty to Aelin and his own strength and backstory add depth. He might be on a quest to save her, and his actions and decisions can be really engaging. Then there's Lysandra. Her shapeshifting abilities and her complex relationship with Aelin make her a fascinating character. She could be using her skills in unique ways to help Aelin in the fanfiction.
Love is a very common theme. Their deep and passionate love for each other is often explored further. For example, how they express their love in different situations.
Another type could involve Feyre getting physically hurt while exploring a new and dangerous part of the fae realm. She might be poisoned by a strange plant or attacked by a previously unknown creature. The fanfiction could then focus on her journey to recover, both physically and mentally, as she tries to figure out how to deal with this unexpected setback.
Love is a very common theme. Their passionate love for each other is often explored in great detail, from the initial attraction to the deep and abiding love that develops over time.