In my book The Neverending Story I think the mentor is Falkor the Luckdragon.
This is an image of Atreyu (left) and Falkor the Luckdragon (right) together.
The reason as to why I would count Falkor as the mentor in this book is because when Atreyu embarks on his large mission he comes across the Luckdragon. From then on Falkor shares his wisdom with Atreyu to help him complete his mission. Also throughout the mission Falkor protects Atreyu from any harm that may become of him. I think that throughout the book Atreyu had absorbed Falkor's wisdom and will then carry it with him from now on and maybe later on become a mentor for another. Without Falkor I honestly doubt that Atreyu would be able to make the mission on his own, and I couldn't see this book without Falkor it just wouldn't be possible.
