Leon De Vil

Leon is the first created child of the Devil himself. His name means lion and his character answers his name. Leon grew up quickly and was always pushed to do more than just command the demons. As a prince of Hell, his job was to bring evil to the world. He was callous, deceitful and quite vengeful. His hatred for the human kind and the world itself made him the perfect heir for the throne but his lust for power and desire to destroy the universe made his father rethink. 
And so, almost 6300 years later, when Leon was at his prime, his little sister Hannah was created. Leon hated her even more than the humans because he knew there was a reason for her creation and she was possibly going to take away his throne. While they were both in charge of Hell and the tortured souls, Leon tried to persuade Hannah to do the ultimate evil - demolish everything. However, the Princess never listened to her big brother and was actually plotting against him. One day, however, Leon went with her to the ground and took away most of her powers. When his father asked him, Leon told him Hannah preferred to live with the humans. This enraged the Devil and so he banished his daughter from Hell, leaving her immortal on the Earth for the next 2000 years. 
During that time, Leon was preparing to take the throne and rule the Underworld as his father was ready to retire. However, just then Hannah came back stronger than ever and in her rage she mercilessly killed her brother. The dust he turned into, was put in a jar for a reminder never to cross Hannah - the most powerful female ruler of the underworld, at least for the time being.