"Dualism and balance, even in madness."
Jäger has two personalities, Yin and Yang. Under normal circumstances, Jäger is at best: kind, agreeable, patient, humble, and calm; at worst: indecisive, a push-over, lazy, and cold. When he turns "yang", however, he becomes at best: passionate, steadfast, confident, and industrious; at worst: arrogant, unyielding, mean, impatient, and argumentative. ally only becomes yang if provoked. In both states, he has an interest in balance, at worst a mild obsession.
Jäger was born in Germany to Alexander and Heidi Guntram. Life was good for a while, then everything went wrong. Jäger was still young when the world turned into hell. Luckily, Jäger's parents resisted the madness and protected him to the end. An end which came much sooner than expected. A local gang had been harassing the Guntram's for protection. Now they wanted Jäger as payment. The gang was enraged to find they hid him from them. That moment Jäger saw his own parents murdered in front of him during the chaos. Fortunately, Jäger managed to escape the assailants, running into the streets. However, his fortune soon turned ill as a near by building collapsed, sending shrapnel everywhere, including Jäger's left eye. The pain was just enough to push him over the edge, into madness. Just as his pursuers caught up to Jäger, a meister from the DWMA saved him revealing the gang to be afreet eggs. Feeling bad for Jäger, the meister took him to Shinigami who enrolled Jäger in the academy. Between his enrollment and the present Jäger has had multiple weapon partners, but all left because of his growing madness. Lately it has stabilized, but has proven highly resistant to treatment.