Perhaps a fanfiction where the 'Heart of Gold' is an ancient relic that was lost long ago. Merlin has a vision about it and embarks on a quest to find it. Along the way, he meets new allies and faces new enemies. The heart of gold might have some sort of connection to the prophecy of Albion, and Merlin's discovery of it could be a crucial step in fulfilling that prophecy.
There could be a fanfiction where the 'Heart of Gold' is a metaphorical concept. For example, a character, say Arthur, discovers that Merlin has a 'heart of gold' in a way that he's selflessly been protecting Arthur all along, and this realization changes their relationship dynamics. This type of fanfiction would focus more on the emotional and character - driven aspects rather than a physical object.
Some fanfictions might explore the idea of Merlin having a more equal standing with the knights from the start. Instead of being the servant, he is seen as an important member of the group. This can lead to different character interactions, like Merlin being more involved in the knights' training or them relying on his wisdom more often.
One interesting fanfiction could be about a young wizard who discovers Merlin's old spells related to granting wishes but only for children. In this story, the wizard tries to understand the magic behind it and how it can be used to bring joy to the local kids. Maybe he stumbles upon an ancient book that has Merlin's secrets.
In some fanfictions, Aithusa could play a role in Merlin's discovery of more of his powers. Since dragons are so closely tied to magic in the Merlin universe, Aithusa might show Merlin a new aspect of magic that he was previously unaware of. This could be through some sort of magical vision or by guiding Merlin to a place full of ancient magic.
Another way it can play a role is as a test. Maybe the 'Heart of Gold' has a mind of its own, and it tests those who come near it. It might test Merlin's loyalty to Arthur, his commitment to the good of Camelot, and his control over his magic. If he passes the test, he gets to use its power for good, but if he fails, there could be dire consequences for him and the kingdom.
One scenario could be when Merlin loses his best friend. In some fanfictions, if Arthur is killed in a battle and Merlin is powerless to save him, he would break down in tears. He has dedicated his life to protecting Arthur and seeing his failure would be a huge blow.
One interesting Pokemon Gold and Clair fanfiction could be about their adventures together in the Johto region. It might involve them facing new and powerful Pokemon that weren't in the original games. Another could be a story where Clair helps Gold train his Pokemon to reach new levels of strength.
There could be a fanfiction where gold and silver have special powers in the Naruto universe. Maybe the gold can enhance a ninja's strength while the silver can be used for healing. A story could revolve around a character who discovers these powers and has to protect the gold and silver from being misused by villains.
One interesting 'Naruto Gold Dust' fanfiction could be about a ninja who discovers a new jutsu related to gold dust and uses it in battles. Maybe they can manipulate the gold dust to create various weapons or defenses.
One interesting Merlin Beauty and the Beast fanfiction could be one where Merlin has the role of the 'beauty'. He might use his magic in unique ways to break the curse, like instead of just relying on love, he uses his knowledge of ancient spells. Another could be a story where the Beast is not a typical monster but a powerful sorcerer who was cursed and Merlin has to help him regain his human form while also dealing with the political unrest in Camelot at the same time. And there might be a fanfic where the Beauty and the Beast story is set in an alternate version of Camelot, with different characters taking on the roles and Merlin being the key to solving all the mysteries and saving the day.
In some fanfictions, Merlin's scar reveal could be part of a prophecy. For example, the scar is a sign that Merlin is the 'chosen one' to save Camelot. As the scar is revealed to the court, there is a mixture of fear and hope among the people, and Merlin has to prove himself worthy of the prophecy.