Siegfried Kircheis was an Imperial high admiral who was most notable for his role as the best friend and personal confidant of Reinhard von Lohengramm since childhood, who later became his top admiral. Often referred to as Reinhard's "shadow," Lohengramm viewed Kircheis as a part of himself. Kircheis was frequently present with Reinhard throughout their military career while rising through the ranks of the Imperial Fleet, following him from assignment to assignment, before reaching the admiral ranks himself in 796 UC. Although some regarded him as being the blond admiral's "henchman," Kircheis demonstrated himself to be a highly competent admiral in his own right during the Castrop Rebellion and the Free Planets Alliance's attempted invasion of the Empire.