I'm thinking of making a fanon but I am having trouble doing so. If someone can help me that would be great. The story is about a girl named On Yeen who is growing up in the Earth Kingdom. But she is secretly a firebender. And the avatar! this takes place 350 years after Aang dies. The Earth Kingdom has taken over the five nation as pay back, On Yeen needs to become a Fully Realized Avatar to take down the Earth King. She holds another big secret that only her mother knows. That is the summary Please tell me how to make a Fanon.