Disgaea: Hour of Darkness, a strategy role-playing video game. He is an aristocratic demon with a French accent, and, apparently very few clothes on, given his picture :).
He called himself the Dark Adonis and was a contender for the throne in the game, until Laharl, a half-demon, heir to the throne and main protagonist in the game, wakes up from two years asleep to discover his father King Krichevskoy is dead. Laharl beats Vyres and christens him Mid Boss, which is what sticks.
Vyres is incredibly conceited and doesn't like to lose, often offering excuses if he is beaten. However, he is also fundamentally good at heart because he can hold an artefact which harms the bad and wicked.
As it turns out, Vyres is actually the reincarnation of King Krichevskoy, which probably explains the conceit.
Sources: Disgaea Wiki
Ghostbusters again today for Vinz Clortho the Keymaster of Gozer. Vinz is a demi-god and minion of Gozer the Gozerian, the Destructor (see letter G). He has to get together and get it on with the Gatekeeper to open the portal to allow Gozer to appear.
Before the coming of Gozer, Vinz manifested in New York in the Shandor building as a huge demonic dog, which, according to the Ghostbusters Wiki is called a Terror Dog. He then invaded Louis Tully's party, chasing Tully out of the building and into Central Park, before attacking him and possessing him.
Vinz seemed strangely placid and not very bright after that, allowing himself to be arrested and put into the custody of the Ghostbusters.
He is also the mouth of exposition and has a great speech:
"Gozer the Traveller, he will come in one of the pre-chosen forms. During the rectification of the Vuldronaii, the Traveller came as a large and moving Torb! Then, during the third reconciliation of the last of the Meketrex Supplicants they chose a new form for him... that of a Giant Sloar! many Shubs and Zulls knew what it was to be roasted in the depths of the Sloar that day I can tell you."
Sources: Wikipedia | Ghostbusters Wiki | GB fans Wiki
So, Ghostbusters or video games?
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