That is Kuzko, a NPC from the DnD campaign I play and one of Zhozahis (my player character) former druid-pupils. They followed me to Waterdeep to inform me that the Couatl, I discovered in an ocean abyss in my background story (DM modified that monster a bit), is waiting to die for a while. She reproduced to bequest her offspring with the task, she was created for. But that task became unsolvable, so she doesn't care what happens to her egg anymore. Also I found the egg in an unrelated event in my BG-story and didn't know it was from her.
Anyway Kuzko stays with me in Waterdeep to become a wizard. With the help of Volotamph they want to enroll in the arcane academy of Waterdeep.