It could be that Zuko shares tales of Roku's adventures that are not well - known. These adventures might involve Roku's encounters with spirits that were unique to his time as an Avatar. Zuko's retelling of these events could give new insights into the relationship between the Avatar and the spirit world, and how Roku navigated those complex situations.
One interesting story could be about Zuko uncovering a long - lost secret of Avatar Roku that changes his perspective on the Avatar cycle. Maybe Roku had a hidden connection to the Fire Nation's past that Zuko discovers.
It's possible that the fanfiction could introduce new characters created specifically for this story. For instance, a young Fire Nation scholar who helps Zuko research Roku's history. This character could add an interesting dynamic to the story, perhaps challenging Zuko's beliefs or providing new perspectives on Roku's life and deeds.
One interesting storyline could be Aang and Zuko teaming up to teach the next generation of benders. They combine their different bending knowledge and ways of life. Zuko could teach firebending discipline while Aang imparts the spiritual side of bending.
One idea could be that they face challenges from their respective nations due to their relationship. Zuko's Fire Nation might be worried about the influence of a Water Tribe member, and Katara's tribe could have concerns about Zuko's past. Another plot could involve them preparing for the arrival of their child while also trying to bring peace between the Fire and Water Nations. For example, they could use their unborn child as a symbol of hope for a united future.
Physical harm during battles is also a theme. Since Zuko is often in the middle of combat, fanfictions might depict him getting seriously injured. This could then lead to him having to deal with the physical pain as well as the worry of his friends and allies. Writers might explore how his relationships change or strengthen during his recovery.
Maybe a plot where Mai is kidnapped by enemies of the Fire Nation who want to use her to get to Zuko. Zuko then embarks on a dangerous rescue mission. Along the way, he realizes just how much Mai means to him. Or a story where Zuko and Mai are forced into an arranged marriage by Fire Nation politics. At first, they resist, but as they spend more time together, they start to develop real feelings for each other that go beyond the political arrangement.
One interesting Zuko and Toph fanfiction could be about them going on a journey together to discover a new bending technique. They both have such different bending styles, with Zuko's firebending and Toph's earthbending, that it would make for a great adventure story.
One interesting Roku fan fiction could be about Roku exploring a new, uncharted dimension. He discovers strange creatures and has to use his unique powers to survive and find his way back home.
One great example could be a fanfiction where Zuko falls in love with a commoner in the Fire Nation. The story could explore how their different social statuses create challenges for their relationship. For instance, Zuko might have to deal with the expectations of his noble family while trying to be with the one he loves.
One interesting story could be about a new character who has the ability to communicate with the wildlife in Pandora in a unique way that no one else can. This character might use this gift to help the Na'vi in a time of great crisis, perhaps when a new threat to their land emerges that they don't fully understand at first.
One great 'Prince Zuko and OC fanfiction' is 'The Fire Within Her'. It has a really well - developed OC who challenges Zuko in interesting ways. Another is 'Zuko's New Ally' which focuses on an OC with unique water - bending abilities that team up with Zuko. And 'A Bond with Zuko' is also good, where the OC helps Zuko on his journey of redemption in a very heart - warming way.