There's no way to know exactly who the main characters are without reading the 'running on air fanfiction'. It could be original characters created by the fanfiction writer, or it could be characters from an existing franchise that the fanfiction is based on.
As we don't have any information about the content of 'running on air fanfiction' other than its title, it's impossible to determine the main characters. They could be anyone from superhero - like figures with the power to run on air to ordinary people who discover this extraordinary ability in the course of the story.
I'm not entirely sure specifically as it could be a very unique or less - known fanfiction. It might be about a story where characters seem to be defying gravity or having a very light - footed, almost ethereal existence, like 'running on air'.
I'm not sure specifically what 'running on air fanfic' is about as there could be many different interpretations. It might be a fan - created story about a character or concept that gives the feeling of 'running on air', perhaps in a metaphorical sense like being in a state of extreme excitement or freedom.
Well, in addition to Aang and Katara, there might be other characters that play important roles. For example, Sokka, Katara's brother, could show up and offer his strategic thinking to help Aang and Katara in their adventures. Also, Toph, the earthbending master, might make an appearance. Her earthbending skills and her no - nonsense attitude could add an interesting dynamic to the story. However, at the core, it's still Aang and Katara who are likely to drive the main plot forward in this fanfiction.
The main characters are surely the members of the gaang, which include Aang, Katara, Sokka, and maybe Toph. Aang is the most important as he is an Air Nomad and the Southern Air Temple is his heritage.
There could be her drill sergeant. This person would be tough and no - nonsense, pushing Bella to her limits during training. Another character might be her best friend in the air force, someone who is always there to support her, through the good times and the bad. There could also be a rival, someone who is constantly competing with Bella for promotions or recognition.
If it's the 'Air' anime, the main character is Yukito Kunisaki. He is a traveling performer who is on a quest.
I'm not sure as I haven't read the novel. But usually, there could be a protagonist who is either directly affected by the 'death in the air' situation or is on a mission to solve the mystery behind it. There might also be a sidekick or a friend who helps the main character in their journey.
In 'into thin air novel', there are several key characters. There are the professional mountaineers who have years of climbing experience and are leading the expedition. Then there are the less - experienced climbers who are also part of the group. These characters all have different motives for climbing Everest. Some are in it for the pure thrill of the conquest, while others might be trying to prove something to themselves or the world. Their personalities and backgrounds play a big role in how they interact with each other during the climb and how they respond to the various challenges they face on the mountain.
Since I haven't read 'A Mouthful of Air Novel', it's hard to name the exact main characters. However, often in novels, the main characters are the ones with the most complex storylines. They could be a protagonist who is on a journey of some sort, maybe a personal or emotional journey. There might also be supporting characters that interact with the main character and help to develop the story further, like a friend, a family member or an antagonist who creates conflict.
They could be characters that have some special connection to air and darkness. Maybe there is a character who can manipulate air in some way, like a wizard or a person with special powers. And there could be another character who is associated with darkness, perhaps a villain or someone with a mysterious past that is related to the element of darkness. However, without reading the novel, this is just speculation.