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.
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.
One idea could be a lava bender OC who is an outcast in their village because their lava bending is too powerful and they struggle to control it. They then go on a journey to find a master who can teach them control. Another could be a lava bender OC in a war, using their unique abilities to turn the tide of battles. Maybe they can create lava barriers to protect their allies or use molten rock to destroy enemy fortifications.
One plot idea could be that your OC discovers a long - lost bending technique. This could attract the attention of both good and bad forces. For example, the Red Lotus might want to use it for their own purposes, while Korra and her friends would try to protect it. Another idea is that your OC is an ambassador from a small, previously unheard - of tribe. They come to Republic City to establish relations, but face many challenges due to cultural differences and political intrigue. Or perhaps your OC has a prophecy about the future of the Avatar world and has to convince everyone, including a skeptical Korra, that it's real.
One of the popular 'Air Bender OC Avatar Fanfiction' is 'The Airbender's Legacy'. The story follows an OC airbender who is on a quest to revive the lost airbending traditions. It delves deep into the lore of the Air Nomads and how the OC tries to incorporate that into their own identity. There are also some really nice descriptions of airbending techniques and how the OC learns from the spirits.
One common plot idea is the journey of self - discovery for the firebender OC. They might start off not fully understanding their powers or their place in the world. As they travel, they meet different people and face various challenges that help them realize their true potential. For example, they could encounter a powerful waterbender who forces them to reevaluate their own firebending abilities and find new ways to use them. Another plot idea is the firebender getting involved in a political intrigue within the Fire Nation. Maybe they discover a conspiracy to overthrow the Fire Lord and have to decide whether to support it or oppose it based on their own beliefs.
One idea could be that the OC is a powerful bender who saves a group of characters of different genders from a great danger. In return, they all develop feelings for the OC and form a harem. For example, if the OC is a water bender, they might save some earth benders and fire benders from a group of bandits. Another idea is that the OC has a special ability that is needed to save the Avatar world, and as they travel around recruiting help, different characters join them and fall in love.
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.
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.
One plot idea could be that the OC is a new earthbender in town. Toph senses their potential and decides to train them. Along the way, they face challenges like a group of earthbenders who don't want an outsider learning their ways. Another could be the OC is from a different nation but has an affinity for earthbending. Toph helps them hide this from others while also teaching them. Or perhaps the OC has a special ability related to earthbending that Toph is intrigued by and they go on a journey to discover the origin of this ability.
A good plot idea could be about an Avatar who loses their bending abilities. They then have to go on a journey to regain them, facing various challenges along the way. Maybe they have to seek the help of a reclusive and powerful spirit who demands difficult tasks in return. Another idea is a story set during a time of peace in the Avatar world, but a new threat emerges from an unexpected source, like a group of non - benders who have found a way to harness dark energy. Or you could do a plot where the Avatar has to deal with a civil war within one of the bending nations, trying to bring balance and peace back.