There are fanfictions where Merlin's omega nature makes him form a special bond with the magical creatures in Camelot. This bond then helps him save the kingdom in unexpected ways. For example, he could communicate with a dragon who gives him crucial information.
You can try Archive of Our Own (AO3). It has a large collection of fanfictions, and you can easily search for omega merlin fanfiction using the search bar. Just type in the relevant tags.
The term 'omega' in fanfiction refers to a particular character archetype. It might involve aspects like special powers, a specific role in relationships, or a position within a fictional society. The way it's depicted can vary greatly depending on the fanfiction's setting and plot.
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.
Arya Stark is sometimes reimagined as an omega in fanfiction. Her skills as a faceless assassin could take on a new dimension in an omega - centric story, using her stealth and ability to change identities to navigate the challenges of being an omega in a harsh world.
Perhaps some of the snooty nobles who look down on Merlin and constantly try to get him into trouble. They could be making fun of his clumsy ways one too many times and he just snaps and hits them with a shoe. It would be a moment of satisfaction for the readers who don't like those arrogant characters.
I'm not sure specifically as I haven't read that particular fanfiction. It could potentially be about a character named Ash in the context of an Omega - related fictional universe, perhaps exploring their story, relationships, or adventures within that setting.
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.
Merlin's relationship with Arthur could become even stronger. They might have more adventures together and truly become equals in their fight for Camelot. Their bond could be tested, but in the end, it would only grow deeper.