Meet my Avatar OC, Anka. She's 15, a Waterbender, and though she can fight with it, she mainly uses it for healing. She comes from the Northern Water Tribe, but ran away from home when she was 10.
She never thought Zuko was evil, just hurt, and she had to help him. So she snuck on his ship and went on adventures with him.
What she didn't know until Book 3, was that she found out her mother fell in love with a Firebender who did not like the war. She soon had Anka. Anka's necklace belonged to her mother. But when she was 10, the Firebenders came and killed her mother and father, and she ran away.
Then when Zuko started to fight his father, Anka jumped in and unknowingly did Firebending.
edit: tried to add some shading.
edit 2: Changed the hair bangs.