Karl Ruprecht Kroenen

Karl Ruprecht Kroenen is a villain from the Hellboy series

Kroenen, at a young age, originally worked as a opera singer, until his voice cracked due to puberty. To relive himself, he scratched himself with pieces of an oak tree, which caused him to be a masochist. Later, he worked as scientist for Nazis, but his hand was blown off by a man named Trevor Bruttenholm(who he later killed). After getting his hand repaired, Kroenen has become one of the Nazi war machine's most deadly soldiers.