Fire Dragon and Forest Fire

Jack Frost was sent to find some new guardians, when he found the perfect ones all together in a tower hidden inside the forest. He finds a red headed girl, a guy with shaggy brownish or blackish hair and a girl with long blonde hair, all he had to do was convince them, they're gonna have to train at North's place a lot if they have to defeat Pitch, who is by the way trying to crush children's spirits again. Can they do it?