Sigmund was born in S.1161. His daughter Shirley was born in S.1188.
Since the death of Red Constellation leader and Sigmund's brother, Baldur Orlando, in his fight with arch-rival Rutger Claussell, leader of Zephyr, in S.1203, Sigmund has been hailed as the strongest jaeger in Zemuria. His raw powers have also been compared to a "human-eating tiger".
Sigmund is a brutal individual. He is someone who loves battle and is merciless in his duty as a jaeger. He also has no qualms about killing someone, if his job requires it.
He has a rocky relationship with his nephew Randolph who doesn't approve of the Red Constellation's ways.