If you haven't figured it out this is dropped
But I will at least share what my plans were so you can know how it ends
MC was going to fight in my underground bending tournaments and pass off his vibration technique as a unique earth bending style
He would then be hired to train toph, who figured him out instantly but he still taught her fighting
Then when the avatar showed up he would leave and start trying to find him, but on the way he would see a bunch of destruction caused by spirits and start hunting and killing them
Then eventually he would meet the avatar and aang being angry would try to reason with him. MC says no the bitch slaps entire party
Spirits get stronger and more restless so MC returns to the tribe and takes control, tribe starts killing all sports and fire nation soldiers
Aang finally beats ozai and MC and aang duke it out
IRL I would flip a coin to see who wins and if aang wins MC will walk walk away and start a temple in the mountains where he teaches non benders how to rival spirits
If MC wins then MC will almost kill aang before ravaa appears and forces out MC's spirit out of his body. Then MC becomes a spirit and over time he becomes a wandering spirit and a patron saint of the weak
Sorry I lost motivation life gets in the way. I will probably return to writing, but it will most likely be an actual book.
Tbh my earlier stuff is really bad and I can do better. Sorry for those who still have this book in your library
Sharing my plans is my way of apologizing