Rotbtd: A boy, a dream, his destiny and choices

A young, scrawny, bullied boy who dreams of meeting the heroes of The Big Four in real life gets his wish, only to end up with more than he asks.
With the man on the moon appointing him as the newest member of the Guardians,who now guards something neither The Big Four or the original Guardians predicted, join forces with the Big Four in order to take down Pitch once again, who is now stronger than ever before. But what secrets does the boy hold when he enters the fray between light and dark? What powers does he have that not even North or Pitch even knew of? And will he stray from the path of the good and innocence and bring one of the four down with him to evil?

Book 1 of a new series that I just came up with "Robtbd: A Dark heart but a Light Soul"