An idea I had where a spirit other then Koh gets mad at the Avatar and wanted revenge on them. After all the Avatar been around for at least a thousand lifetimes maybe even more. So you are more then likely to piss numerous spirits in that span of time
This where I came up with this idea where when Avatar Kyoshi created Kyoshi Island by literally ripped it off from the mainland. The spirit of the Earth Kingdom continent was asleep yet when they woke up to find a piece of themselves unnaturally ripped away they got pissed. Deciding to teach the Avatar a lesson by going after Toph(since she is close the current Avatar, Aang).
Just what does the Spirit of Toph's Nation have in store for her well that is currently undecided at the moment.
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Koh the Face Stealer, a spirit that amongst spirits is one of the oldest ones around. Decided to punish the Avatar Kuruk for simply ignoring his Avatar Duties by stealing the face of his wife to be, Ummi. This was the most well known act of spirit punishing an Avatar however it was not the only case. The Avatar has master the elements over a thousand lifetimes thus has had over a thousand lifetimes to royal piss off a number of spirits for any number of reasons.
Slacking off was not the reason that this spirit was pissed off nor would the Avatar that perform the deed would be getting the punishment. Mostly because the spirit was asleep at the moment and when they woke up they realized what happened and who did it. Upon realizing this they were wiped into a frenzy rather quickly.
That spirit that was so angry at the moment was the spirit that represent the massive continent the Earth Kingdom was on. The thing that cause then to rage was when they realized they piece of them had broke off to form a new island that was not suppose to exist. Island especially ones like this one where there rather large in size did not just pop up out nowhere after all. It took countless years for something like this to happen thus they began asking around.
Of course they got laughed at by the other continent spirits for quiet some time. Before finally they stopped and told them that while they were sleeping the Avatar did that to them. They decided to rip off their homeland from the main land turning it into an island. After explaining it to the Earth Kingdom spirit, the others broke out in laughter again.
Remembering that while it was happening the massive spirit just remained asleep barely stir over a piece of them being ripped off. For what happened in the mortal world affect them in the spirit world if it was big enough impact. After all they directly link to the landmass they represented since they control continental shifting, land recovery after damages, etc.
Angry ran through them as the Avatar broke a pact that was made long ago where they would never make their own landmasses…again. The other continent spirit tried to tell them that the pact was created so long ago by the very first Avatar in fact. That they split them from one to four separate spirits along with very land itself. This was done as way to promote balance between the benders at the time that waging war with each other using energy bending. The first Avatar gave each of the four warring fractions there very own continent to rule over and over time they would become the Four Nations.
So since this was something the very first Avatar did and it simply lost to history as many things are with the humans. After all they can not remember everything that was ever promised as the human mind and memory has limits they however managed to keep the main ones even if they stumble or screw up at times. However that did not matter as they set on getting revenge on the Avatar for making an island simply to save their homeland of the moment. It was something they could not understand as the Avatar had hundreds of homelands in the Earth Kingdom before so what made this one so special (not truly realizing those different avatars and not the same one).
Thus they went about planning on how to get back at the Avatar for not probably ensure that no future one ever think about making their own landmass. However the problem was just who were they going to go after as rather then go them directly. The spirit was going to go after someone close to them instead thus began looking over who they might take it out on.
There was Water Tribe girl that was very close to the Avatar but that would seem to unoriginal as they already had the avatar with grudge against Koh over taking one of them. Hence why possibly create setting where another by doing the same thing as him. However the spirit did not have to look far before finding another target that was perfect target. There another around him that was almost as important to him as that Water Tribe girl.
What made the set up even more perfect was that this girl stood out amongst the other making all the much easier to find her wherever she went. So the one that began to target for their plan of getting back at the Avatar was Toph Bei Fong.