|Date of Birth||July 1st, 2000|
|Date of Death||August 6th, 2026|
|Relative(s)||Mephiles (father), Delia Falcone (mother, deceased), Vincent Worthington (step-brother, deceased), Aoi Kamazuki (step-sister, deceased), T'Sharok (step-brother, deceased)|
Leon Falcone, born Leonardo Darna Falcone, was the son of the demon prince known as Mephiles, and was a professional monster hunter.
Leon, along with his older step-brother Vincent and younger step-sister Aoi, was the result of Mephiles' breeding with a human female. He was born in Venice, Italy. After his birth, his mother died under mysterious circumstances, when actually Mephiles had come and stolen her soul. Leon was placed in care after his mother's death. When he reached the age of five, he met his demonic brother, T'Sharok, whose mother was a she-demon called T'Shuda. T'Sharok attempted to kill Leon, but Leon managed to cheat death. The experience left Leon with the urge to kill the hellish creatures that roamed the Earth at the time.