On December 25th. Christmas Day
Santa delivers present on Christmas Eve.
A santa paws
Santa Clause traditionally delivers present.
If you are on Santa's NICE list then you may get a present delivered to you (by Santa) on the evening of the 24th December while you are asleep (you must be asleep for this to happen). If you are on Santa's NAUGHTY list then you need to tell your Mum and Dad (or your carer) that you are sorry or you may not get a present from Santa.
Julenissen (Santa)
Santa
Santa Claus delivers the gifts, as long as he isn't sick (if he is, Mrs. Claus does it), and he makes sure that everything gets done before the kids wake up. It is pretty hard, since kids don't seem to sleep much that night.
His elves.
Sometimes they are. It depends on the custom in the area Santa is visiting.
Santa!
156 million
Santa Claus
No one does