For freedom and justice for all...
George Kristen was a normal person.
He was a doctor, and he served the allies in the war as a combat medic.
One day, his squad came upon a camp.
One of the camps where the Germans did...
Experiments.
Some say it drove him mad.
No matter who the storyteller, something changed in George that day.
He interrogated a German officer, before giving him an "operation".
Now, armed with the knowledge of key German individuals, he hunts during the night, curing his targets of a little-known disease that George calls, "Living".

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Hello there!
This is a possible character for the Assassin's Creed universe, in the WWII time period.