Klein was born to a noble Lugnican house. After some time however, Klein ran away from home, married a commoner girl by the name of Maria and started a family. Together, they had a son who they named Julius Juukulius. The three of them continued living a peaceful commoner life, until Klein and Maria's untimely death during a flash flood that suddenly occurred. After their demises, Julius was taken in by Klein's brother Alviero Juukulius.