"Dr." Klaus-Dieter Ulfkotte, Dentist

Why is the character in the Antarctic base? What occupation?
"Doktor" Ulfkotte is the designated dentist of the base.
The original dentist has blasted off to the moon, and Klaus-Dieter, being the one with the greatest dental experience remaining, was designated as the dentist, pending posthaste arrival of the new dentist.¹
Klaus-Dieter can hardly wait for that day, so he can spend time with his beloved Ingeborg!

He is still referred to as 'Doktor Ulfkotte' by the brass, so as to not alarm the troops.
Ingeborg calls him 'Klaus-Dieter'.

¹) Which gets killed upon arrival. Maybe he arrives with the party official, or he dies of hypothermia, or he crosses the PC's path and needs to be 'disappeared'...
In fact: Once the party official arrives, the dentist is left in the lock, while the arrival is celebrated, and dies of hypothermia there.
Or he gets mauled by rabid penguins.
Or he DOES partake in the celebratory ceremony, and dies of HYPERthermia because he had wrapped himself in too many layers because he is susceptible to cold. He had to stand in formation for too long, and collapses halfway through a speech. At which point a long wail can be heard from Ulfkotte, followed by a sharp reprimand.

Is the character completely loyal to the nazi ideals?
Klaus-Dieter is an active member of the SA, even after the "Röhm-Putsch".
He is a proud Nazi, but many in the SS question his loyalty because he still clings to the SA.

How does the character react to violence?
In the SA he was hazed a lot, and he beleives in the necessity of it for building motivation.
His trade puts him in a position where others do not want to get on his bad side, which he does abuse sometimes.
He received good training in the SA, and handles himself well in a fight.
If anything threatens his beloved Ingeborg, he sees red, becomes a killing machine.

What kind of goals does the character have? What kind of interests?
Klaus-Dieter wants nothing more, than to be with his beloved Ingeborg.
He pulled some strings so he would be paired with her
That, and TOTAL VICTORY.

What makes the character stand out? Any quirks or specialties?
He doesn't actually hold a doctors title. Though well versed in dentistry, with years of practical work, he is still only an assistant. So if you get on his wrong side, he will gladly skip using complicated methods, and just pull your tooth.
On quiet, slow days he will steal away to see his romantic interest Ingeborg, who works in one of the factories.

He gets along well with Gerulf Mehner, especially because he can task Gerulf with the easier jobs and steal away to find Ingeborg... (The added workload doesn't help with Gerulf's frustration, but he thinks he is helping a love-sick friend, and loves to listen to the details that Klaus-Dieter doles out, albeit sparingly)

What items does the character carry?
-love letters to Ingeborg
-rose scented 'Kölsch' water (#1147)
-diamond-studded silver ring that he wants to use to propose to Ingeborg