First, for your Avatar Water Bender OC fanfiction, make your OC stand out. Give them a distinct look, perhaps with unique water tribe tattoos. In the story, you can introduce some conflict. Maybe they are not accepted by their own tribe because their water bending is different. Then, think about how they interact with other characters. They could form an unlikely friendship with a non - bender. As for the plot, it could revolve around a mystery related to an ancient water bending technique that only your OC can unlock. You can also add some humor to the story, like when your OC tries to teach a clumsy earth bender how to be more fluid like water.
For an Avatar Water Bender OC fanfiction, consider this plot. The OC is a water bender who has the ability to communicate with water spirits in a way no one else can. A dark force is starting to corrupt the water spirits, and the OC must go on a quest to find out what is causing this and stop it. Another idea is that the OC is an outcast in their water tribe because they have a different way of water bending. They leave the tribe to prove themselves and end up joining a group of rebels fighting against an oppressive regime. And yet another plot could be that the OC discovers a secret underground water source that has special properties, and they have to protect it from those who want to use it for evil purposes.
Exciting action scenes involving lightning bending are a must. When the lightning bender is in a battle and uses their unique abilities, it should be described vividly. The way the lightning arcs, the sound it makes, and the power it holds. Additionally, an exploration of the moral implications of having such a powerful ability. For example, should a lightning bender use their power to take revenge or for justice?
There's also 'Lightning in the Shadows'. In this fanfic, a group of lightning benders are part of a secret society. The story is full of mystery as they try to protect a powerful lightning - based artifact from falling into the wrong hands. The descriptions of the lightning bending techniques are very detailed.
Percy might face some challenges too. For instance, water bending has its own set of rules and ethics in the Avatar universe. He would need to learn and adapt to these while still maintaining his demigod identity. Also, his friends might be a bit wary of his new powers at first. But as he masters them, they would see how useful they are. He could use water bending to heal his friends, for example, by using the purest form of water to cleanse wounds and restore energy, something that could be a new aspect of his relationships with his comrades.
In a fanfiction, Percy could meet characters from the Avatar: The Last Airbender universe. They could teach him more advanced water bending techniques. He might learn how to turn water into ice sculptures with intricate details, which he could then use as both a form of art and a weapon. This would add a whole new dimension to his powers and his character development.
Power and responsibility is a big theme. Just like in the original Avatar series, the OC airbender has to learn when and how to use their powers. Friendship is also common. They usually form bonds with other characters, either from the original series or other OCs. For example, they might team up with a waterbender to fight a common enemy.
It's about the adventures in the Avatar world. There are different nations, like the Water Tribes, Earth Kingdom, Fire Nation and Air Nomads. The Avatar, the one who can master all four elements, has to bring balance to this world filled with political intrigue, power struggles and different cultures.
I really liked 'Avatar's Time - Traveling Spirit Adventure'. In this fanfiction, the Avatar uses spirit - bending to accidentally open a time portal. What follows is a wild adventure where they have to deal with different versions of themselves from other time - lines. It's full of action and interesting character interactions.
One idea could be exploring the early life of a new Na'vi character. Maybe they grew up in a different part of Pandora and had unique experiences with the local flora and fauna that are not shown in the movie. For example, they could have a special bond with a rare creature that helps them in a time of crisis later in the story.