I would recommend 'The First Meeting'. It's a short and sweet story that gives a good introduction to how Merlin and Killian could meet in an alternate universe. It has simple language and a clear plot.
One great story could be 'The Enchanted Bond' where Merlin uses his magic to save Killian from a dark curse. It delves deep into their relationship as they face various challenges together in a magical realm.
In some fanfictions, Killian Jones might be involved in a time - travel scenario. For example, he could accidentally be sent back to a time before he became Captain Hook. He then has to deal with his former self, trying to avoid changing the future while also coming to terms with who he used to be. It could be a really interesting exploration of his character growth.
I would recommend 'Merlin: The Merman's Awakening'. It has a simple and easy - to - follow plot that is great for those new to the concept. It quickly introduces the idea of Merlin as a merman and the challenges he faces. Another good one is 'A Merman in Camelot', which gives a good overview of how Merlin's merman side would interact with the Camelot setting. It's not overly complicated and is quite enjoyable.
Love and romance are also very common. The OC and Killian usually end up in a romantic relationship. Writers explore different aspects of their love, like the initial attraction, the challenges they face, and how they overcome them. It can range from a slow - burn romance to a more immediate connection.
One great Jessica Jones fanfiction is 'The Redemption of Jessica Jones'. It delves deep into her character, exploring her past traumas and how she might overcome them in new and unexpected ways. The author does an excellent job of capturing Jessica's voice and her no - nonsense attitude.
One plotline could be that the OC is a mermaid. Killian Jones, being a sailor, has always been intrigued by the legends of mermaids. When he encounters this OC mermaid, she is in danger from a sea - witch. He decides to help her, and in the process, they form a bond. Their relationship could develop as they explore different underwater and on - land adventures together.
One interesting theme is redemption. Killian Jones, with his complex past, often finds himself on a path of redemption in these fanfictions, especially in relation to his interactions with Peter Pan. For example, in some stories, he tries to make up for his past misdeeds by helping Peter protect Neverland.
One great Killian Jones OC fanfiction is 'The Pirate's New Horizon'. It has an interesting original character who gets involved in Killian's adventures in a really engaging way. The story does a wonderful job of exploring Killian's character further through his interactions with the OC.
One great Merlin and Gwen fanfiction is 'A Royal Bond'. It beautifully explores their relationship in a world filled with magic and political intrigue. The author does a wonderful job of portraying Gwen's strength and Merlin's loyalty.
I really like 'Merlin and the Dragon's Bond'. In this fanfiction, the relationship between Merlin and the dragon is explored in a very deep way. It shows how their bond affects the events in Camelot and Merlin's role in it. There are some really exciting magical battles in it too.