Sieglinde Lange (シグリンヅ ランジュ Sigurindu Ranju), nicknamed Siggy (シグ-くん Sigu-kun) by Makoto Kokukijo, is a Quincy, and former member of the Vandenreich (見えざる帝国 (ヴァンデンライヒ), Vandenraihi; Japanese for "Invisible Empire"), as well as a former Stern Ritter (星十字騎士団 (シュテルンリッター), shuterunrittā; German for "Star Knights", Japanese for "Star Cross Knight Band/Order"); having the designation of Stern Ritter "M", and, among the Stern Ritter, was known as "Sieglinde of the Blue Flames" (青炎の シグリンヅ Aoen no Sigurindu), due to his mastery of the Heiliges Feuer.