Vaermina's Devout
Race: Breton Vampire
Combat: Skull of Corruption, Blade of Sacrifice (absorb health, chaos damage), master illusion and alteration, adept destruction and restoration perks minus the one's which decrease their cost
Major Skills: Sneak, Illusion (minus reduction), Alteration (minus reduction), Alchemy
Minor Skills: Destruction, Restoration (minus reduction), Enchanting, Speech
Armor: Vaermina's Robes (reduce illusion & alteration), Vampire gloves (fortify and boots (resist fire and shock), gold and emerald circlet (reduce illusion and alteration), gold and sapphire ring (reduce illusion and alteration), gold and emerald necklace (reduce restoration and fortify alchemy)
Other: Feed off of every sleeping person you come across and use the staff on them, in battle, sneak in and deal with as many people as you can with the BoS dipped in deadly poisons, once detected, use the staff in one hand and set up a flesh, a cloak, then have an adept destruction spell like Fireball and raze/horrify them. Block out the sun any chance you get and make Skyrim reminiscent to the nightmares of it's residents.
Not nearly as creative as the Sheogorath guy, but it's my first, so it's supposed to suck.