Sigmund Åke Adolvsson was the first child born to the German Gabriele and Swedish Olle Adolvsson in Sollefteå, Sweden. The eldest of two, he was almost the perfect eldest child for the majority of his life before school - adept at Quidditch, adept at keeping his little sister out of trouble, adept at charming adults. Not, however, adept at following rules. His mother often affectionately called him a "ladies' man". He still finds this amusing, because he is much more of a "gentlemen's man", if you catch his drift.
When the time came to choose a school, Sigmund was accepted into four - Durmstrang, Hogwarts, the German Institute and EESM. He chose Durmstrang, much to his father's delight, and was soon shipped off to school. A few years later, his little sister Sieglinde chose EESM, much to his disappointment. Upon beginning Durmstrang, he quickly made a friend in Amalie Falkenrath the
In his fourth year, he fell in with the "bad crowd", though a better description would be "wannabe criminals", all thanks to his good friend Amalie. Neither his parents nor his teachers appeared to notice, however, as he somehow managed to keep up his grades. Outside of school hours, it was a completely different story. He became skilled at taking things that weren't his, and at other less-than-legal pursuits.
Upon graduation, Sigmund left home and went freelance, since the only of his schoolfriends who was even remotely talented enough to make a decent partner in crime went solo. Working up a reputation among the other black market traders, assassins, and thieves, he eventually became acquainted with the master thief Xavier Hartt. Eventually, Xavier invited him to join the Black Parade, and Sigmund accepted.