Avatar: The First Timebender

Shi Li wakes up in a forest with no recollection of her past, and, after meandering aimlessly for two days, accidentally walks off a small cliff and lands on Prince Zuko and Uncle Iroh as they pass by in search of the Avatar. She soon discovers she has unique bending abilities, and joins Zuko and Uncle Iroh on their ship so that she can attempt to hone her powers under the guidance of Iroh. Along the way, she meets odd friends: a firebender who literally sucks the life out of fire, a female stowaway in Zuko's crew, a tunneling earthbender sent to keep tabs on Zuko, a man who approaches the ship on a tiny raft and claims to be her fiance, and an earthbender who has sworn upon her life that she will kill Shi Li, because she believes Shi Li's people destroyed her village.
But there's one problem with two of those "friends": Shi Li doesn't know who her people even are. She can't tell if the raft man is really her fiance, or if she really helped kill a whole village. Follow Shi Li through the three books in the original Atla series as she regains her memories and has decide whether she wants to recreate the past--or help shape the future.