This might come as a surprise, but most of the time Leon lives in prison. To pay of his debt, he works for AX.

He's very kind, though. He's a loudmouth and a klutz, but gets serious once they get a mission. His aim during fighting is pretty good.

Leon also hates being called an old man. In one of the later episodes of Trinity Blood, it's revealed that Leon has a daughter. Whether she is still alive or not has never been confirmed.