Rather than Santa, I would like Tom to be The Doctor but also come and visit me at Christmas through the chimney. I don't think red would suit him. But I see your line of thinking. Tom has a lot of authority, he is slightly intimidating, and at the same time he has all the goodness it takes to be Santa. And I can totally imagine him asking whether I've been good or naughty.
"Once, I was a real turtle"