Kroenen, from the first Hellboy movie. If you're interested in his backstory, here.
Born in Munich, Germany in 1897, Karl Ruprecht Kroenen was a musical prodigy with angelic features and blonde hair, who toured the capitals of Europe singing opera, until his voice deepened with the onset of puberty. From a very early age, Kroenen demonstrated symptoms of masochism, whipping himself with a fresh branch of oak each day. By his teenage years, feeling awkward, Kroenen's masochism developed into an extreme form of body dysmorphic disorder (termed "surgical addiction" in the film). In his obsession with physical perfection, Kroenen conducted brutal experiments on his own body, including surgically removing his own eyelids, lips, and his nails, both from his toes and fingers. He also designed a tight-fitting gas mask to filter out germs, which he wore almost permanently. Kroenen was quite adept with mechanical devices, believing that fusing mechanical constructs with living bodies would help create perfection. One of his early inventions was a clockwork nightingale that sang a Mozart aria perfectly.
In 1930, Kroenen met the resurrected Rasputin for the first time and quickly became his most loyal disciple. He subsequently joined the Nazi Party, and rose quickly through the ranks, joining the Schutzstaffel in 1933 and achieving the rank of Obersturmbannführer (Lieutenant Colonel). He was awarded the Iron Cross for services to the Third Reich, including a tour of duty as commandant of Auschwitz concentration camp, where he served with distinction. Kroenen became head of the Thule Society, a group of German aristocrats obsessed with the occult. He helped them to spearhead Project Ragna Rok, engineering the portal generator that would conjure the Scarlet Beast, Hellboy, in October 1944.
