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 Peter Pan fanfiction is 'The Pirate and the Boy'. It delves into an alternate universe where Killian and Peter Pan form an unexpected alliance. The story is full of adventure, with vivid descriptions of their encounters on Neverland.
One great one to start with could be 'A Pirate's Heart'. It really delves into the relationship between Killian Jones and the reader in a very sweet and adventurous way. It starts with an interesting encounter between the two characters and gradually builds their relationship as the story progresses.
A common theme is redemption. Since Killian Jones has a complex past, many fanfictions use an OC to be a part of his journey towards redemption. For example, the OC might be the one who believes in him when no one else does.
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.
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.
There's one where the reader is a time - traveler and accidentally gets stuck in the 'Once Upon a Time' world and meets Killian Jones. They have to work together to find a way for the reader to get back home while falling in love along the way.
One great place to start is Archive of Our Own (AO3). There are numerous Killian Jones x OC fanfictions there. You can search for ones with high ratings and lots of kudos. For example, 'The Captain and the Maiden' is a well - written story that delves deep into the relationship between Killian and an original character. It has a rich plot and well - developed characters.
One common theme is adventure. Given Killian Jones' character often being involved in adventures in his original story, fan fictions may feature the reader character joining him on his escapades, like sailing on his ship or exploring new lands.
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.