Thirteen

Also called "Dreizehn," which is German for the same number.

Life Story
Dreizehn, by birth, is a full blooded Hessian. We learn from his rants in The Winter Soldiers that he has traveled the world extensively. These travels began when he was enslaved as a child. He escaped to Alexandria, Egypt, where he joined a mercenary unit hired by America to fight the Barbary Pirates at Tripoli. When the Americans were unable to pay all of the mercenaries, Dreizehn, being a child, had nothing to his name except for valuable lessons about humanity and power.

He gathered his power from there onwards, seiging many castles, and committing what he had learned to paper. The Captain of Arendelle's guard remarks during the Winter Soldiers that half of the books on his desk were written by Dreizehn, and all of them on siege warfare. When Dreizehn arrives in Arendelle, he is the commander of a Hessian mercenary company that is two-thousand men strong. The unit is mostly Hessian, but includes Arabs and Chinese as well, due to the loyalty Dreizehn has earned over his years.

Description
Started off as a Mercenary Captain and leader of the Hessian forces during The Winter Soldiers and later became Admiral of the Arendelian Navy prior to the events of The Cold War. He is known to be bloodthirsty, and often follows excellent kills with excellent puns.