A possible plot could be that aang travels to a mysterious place where the normal rules of bending don't apply. There, he is exposed to some sort of energy or magic that transforms him into a firebender. The rest of the story could be about him trying to find a way to reverse this change, while also using his new firebending skills to protect himself and those he cares about from various threats in this strange new world. He might also have to face the moral dilemma of using firebending, which is associated with the war - like fire nation, in a positive way.
Yes, if the title 'aang is a firebender fanfic' is to be taken literally, then aang is likely a firebender within this fanfic. However, without actually reading the fanfic, there could be some sort of plot twist or alternative interpretation that might make it not so straightforward.
Maybe in the fanfic, aang is trying to cheer toph up. He finds a rare fruit that has a unique taste. Toph is initially skeptical but then loves the fruit. And this simple act of sharing the fruit strengthens their friendship. The story could also involve them facing some challenges while looking for more of this fruit.
Well, it could be about Aang and Sarutobi teaming up to face a common enemy. Maybe an ancient evil that threatens both their worlds.
Well, one possible plot could be that Aang is hit by a strange magic or spell that turns him into a girl. He then has to deal with the new physical form while still trying to fulfill his duties as the Avatar. Maybe he discovers new aspects of the world around him that he didn't notice before as a boy, like different social expectations for girls in the Avatar universe.
Maybe in the fanfic, they are dancing to celebrate a victory over the Fire Nation. Aang has just defeated a powerful Firebender and Katara is overjoyed. They start dancing spontaneously, and their movements are a mix of Aang's Airbending - like grace and Katara's fluid Waterbending - inspired steps. They twirl and spin, and the onlookers can see the bond between them growing stronger.
One possible plotline could be that Azula, initially seeing Aang as an enemy, gradually comes to understand his kind heart through various encounters. For example, they might be forced to work together to face a common threat greater than their own differences. As they spend time together, Azula starts to notice Aang's selfless nature, his love for all living things, and his determination to bring peace. This newfound understanding begins to chip away at her own hardened views and she finds herself falling for him.
One possible storyline could be their adventures in rebuilding the world after the war. They might travel together, using Aang's bending skills and Katara's healing abilities to help people. For example, they could encounter a village suffering from a water shortage, and Katara uses her waterbending to find a new water source while Aang helps with the physical labor of constructing a new well.
The plot might involve Zuko losing his scarf. Aang then makes it his mission to find it for his friend. Along the way, they encounter various obstacles and characters from their past. This could lead to some deep conversations between Aang and Zuko about their friendship, their past mistakes, and how far they've come. As Aang searches for the scarf, he also discovers more about Zuko's insecurities and what the scarf represents to Zuko in terms of his identity.
It could be that Aang disappears because of a prophecy. He might believe that by disappearing, he can prevent a catastrophic event from happening. His friends, not knowing this, embark on a journey to find him, facing many challenges along the way. They might discover secrets about Aang's past that they never knew before, and these secrets could be the key to bringing him back.
The writer might be trying to add some drama to the story. By making Aang hate Katara, it creates a conflict that can drive the plot forward. For instance, their friends might have to work hard to resolve this hatred and restore their friendship.