There's 2 santas.
1. Saint Nicolas, lived some 1000 or so years ago in ye olden days.
2. The fat guy who goes down your chimney, lurks in your house and gives you gifts.
Actually, there are many Santas. It depends on the culture. The image of what Santa, in America, is today comes from mostly Coca Cola. In Italy, Babbo Natale is much more true to Saint Nicolas, a more slender, elderly man. In the UK, they have Father Christmas, ect ect. I was just asking to see which one he's wants to go by - whether it will be skinny or fat, white hair or gray (Or brown), red suit or gold. Things like that.