Sparda

Sparda is a demon that rebelled against his own kind for the sake of the human world two thousand years prior to the events of Devil May Cry. He defeated countless demons and their Emperor, Mundus before sealing the gateway to the demon world, sacrificing both his own blood and that of a mortal priestess. These actions made him a legend in the human world, gaining him the moniker, The Legendary Dark Knight Sparda though they also incurred a notorious reputation amongst demons, many of whom were defeated during his rebellion. After his death, most of Sparda's power was concealed in the demon realm, sealed inside his sword- the Sparda/Force Edge, and was only accessible with an amulet he took with him into the human world. This amulet, which can be separated into two parts, was also one of the keys needed to unlock the portal. All its abilities are deactivated if the halves are separated. Near the end of his life, Sparda settled with a human wife, Eva, and fathered twin sons, Dante and Vergil. He gave his amulet to Eva as a gift which she in turn later separated and passed to her sons. Both Vergil and Dante received a powerful, enchanted sword from their father, Rebellion to Dante and Yamato to Vergil.