Just for the spirit of Christmas.
Extravert.
Most images of Santa we see are gregarious and jolly. Is frequently in the company of others.
Si-Valuing
Attachment to milk and cookies, probably led to his weight gain. Not only comfortable with this but proud of it.
Feeler
Mercy > Justice. Many years I deserved coal, but Santa always found a way to get me my favorite video game. His whole purpose is giving.
Fe>Fi
Very expressive. Has a trade mark laugh "Ho, ho, ho!!!"
Accommodating of others' feelings. His goal is to make others feel good.
Fe/Si > Fe/Ni
Not about changing the world, but making people happy in the here and now with presents.
Other notes
Leadership style consistent with ESFj- Often depicted as the leader of his factory, using his worker elves as pawns.
Conclusion: ESFj/ESE