The long suffering Lieutenant of Johannes Kal, Susan has been with the Company of Steel for years now and her skill as a combatant along with her ability to manage Johannes' moods rapidly led to her becoming his second. With Johannes Kal becoming nobility she became the Captain of the Company of Steel.
Johannes believes he rescued Susan as a child from an orphanage that mistreated her and then inducted her into the company; however, Susan maintains that she joined as an adult after seeing and rescuing Johannes from an orphanage that was burning down (the cause of the fire remains a mystery).
Following the battle against Enyalius the ranks of the Company of Steel have surged and Major Miller now has several captains reporting to her.