You never know who , or what, you might meet in the forest at night. It seems friendly and that gift IS beautifully wrapped...
That is all my non-TF audience received for explanation. WE know he's an entity who uses transformational magic on the unsuspecting.
However, is he a trickster, making people's lives surreal and interesting for a day or three? Is he a demigod of vengeance, inflicting poetic justice on transgressors? Or, is he a malicious demon who transforms people for the sheer evil joy of it?
That, of course, is up to you all...