Mephisto (Diablo)

"The skies shall rain fire, the seas will become as blood, the righteous shall fall before the wicked, and all creation shall tremble before the burning standards of Hell!"

- Mephisto

Mephisto is one of the Great Evils who rule the Burning Hells in Diablo - he is known as the Lord of Hatred.

Story
Mephisto is the oldest and wisest of the three Prime Evils, and also the grandfather of Andariel. After his soul is banished to the mortal realm by the traitors Belial and Azmodan, he and his brothers are hunted down by the order of Horadrim. He is the first to be captured and is imprisoned in a soulstone, which is then buried under the sands of the East, in a place where later was built the temple of the Zakarum and the city of Kurast. Under his inprisonment, he twists the soulstone and manages to corrupt all of the high council of the Zakarum. However, the leader of the Zakarum, Khalim, never gave up to the corruption of Mephisto and fought against his former comrades. Mephisto order them to kill Khalim and disembody his parts, scattering them on the jungle. Without any more obstacles, he spreads his evil influence over all Kurast, and the place soon become infested with monsters. The few who survived ran away and hid in the docks of Kurast, protected by a magic barrier created by the mage Ormus. Mephisto then just had to wait for his brothers Diablo and Baal to come free him. Diablo, in the guise of the Dark Wanderer, and Baal, using the body the Horadrim mage Tal Rasha, arrive at Kurast and release Mephisto, who starts a ritual to open the gates of Hell and to recreate Diablo's body. As Diablo steps through the gate to gather the armies of Hell and Baal goes after Marius to retrieve his soulstone, Mephisto stays there to fight the adventurers who were after Diablo. Mephisto is defeated, and his soulstone is later destroyed in the Hellforge, which banish his soul forever. Shall he return from the bowels of hell? Only time will tell in the next installment of Diablo (3)

Personality
Like his brothers, Mephisto is completely evil, being the most serious of the three. Despite the fact that he and and his brother are getting along with each other, he had tendency to pit them against each other, giving his title as Lord of Hatred. He also most intelligent of the three, as he formulate his evil plans better than his brothers.