One popular plotline is exploring Merlin's hidden powers more deeply. For example, fanfictions might have him discover new spells or abilities that were not shown in the original series. Another common one is alternative relationships. Instead of the canon relationships, writers may create different pairings for Merlin, like a friendship - turned - romance with a side character. There are also plotlines that involve Merlin changing the course of major events in Camelot's history, such as preventing certain battles or political upheavals.
You can try fanfiction websites like Archive of Our Own (AO3). It has a vast collection of fanfictions, and you can simply search for 'Merlin last name' in the search bar. There are likely to be many stories that explore different aspects related to Merlin's last name.
Wattpad also has some really good Merlin fanfiction. There are some up - and - coming writers on there who put their own unique spin on the Merlin story. Another option is Tumblr. While it's more of a blogging platform, many users post short fanfiction snippets or link to longer works related to Merlin.
One interesting original character is often a powerful mage who comes to Camelot to either help or challenge Merlin. This character might have a different style of magic that Merlin has never seen before. Another could be a mysterious traveler who has knowledge about Merlin's true destiny but is reluctant to share it all at once. There are also original characters who are commoners with hidden magical abilities that Merlin discovers and decides to train.
There's a great fanfiction called 'Merlin's Journeys Beyond Camelot'. In this one, Merlin leaves Camelot on a quest and has various adventures that test his loyalty and magic. It also explores his relationships with other characters in new and interesting ways. Additionally, 'Merlin and the Enchanted Forest' is a fanfic where Merlin discovers a mysterious forest filled with ancient magic and new challenges.
Another theme is Merlin's magic and how he hides it or uses it to save the day. There are also fanfictions that focus on Merlin's backstory, like his life before coming to Camelot and his family.
In a more humorous take on the 'Merlin tied to a bed' fanfiction, it could be that Merlin has fallen ill and the overly - protective Gaius has tied him to the bed to make sure he rests. Merlin, being the active person he is, complains constantly. Arthur comes to visit and teases Merlin about finally being still for once. Meanwhile, Merlin tries to convince Arthur to let him loose, promising that he'll be fine. Eventually, Gaius relents and unties Merlin, who then immediately starts bustling around the room.
If Merlin died in the fanfiction, it could trigger a series of tragic events. The balance of power could tip, and the villains might seize the opportunity to attack. It could also bring out hidden strengths in the remaining characters as they try to cope with the loss.