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