I haven't read this comic yet, but I made up my own version of the father of Hearth's Warming simply known as the White Reindeer.
Like your Santa Hooves, he flies over Equestria during the night of Hearth's Warming Eve, he pulls a chariot carrying a bag of toys for him to deliver. guided by the Fire of Friendship he delivers all these toys in one night.
So I finally had the time to go browse your gallery...and then this showed up. I instantly fell in love with it (and not just because it featured AJ); the colours, the style, the expression, the story -- you did a brilliant job on this, and I hope you won't stop being awesome!