Probabilitor the Annoying

Probabilitor the Annoying is a villain from Gravity Falls who originated as a fictional character in the Dungeons, Dungeons and More Dungeons game setting (a parody of Dungeons & Dragons) - yet he was brought to life via the power of the Infinite-Sided Dice, promptly becoming a major threat to everyone involved, accompanied by a griffin, several ogre-like henchmen and the "Handsome Elf".

Abilities
Probabilitor the Annoying is an extremely powerful supernatural being similar to a wizard but his style of magic is based on math - nevertheless he is a reality-warper capable of almost any feat he desired, yet was restricted by the rules of Dungeons, Dungeons and More Dungeons: thus for all his power he was still infinitely below a virtually-omnipotent being such as Bill Cipher.

He is also a vampire of sorts who eats the brains of others, absorbing their intelligence into his own.

Personality
Probabilitor the Annoying is a classic "fairy tale" villain and as such as wicked without much reason other than he enjoys being so, yet he is also comical and is known to have a dark sense of humor - a good example of this is when he forced Stan into playing "Dungeons, Dunegons and More Dungeons - Real Life Edition", using Dipper and Ford as unwilling combatants.

Appearance
Probabilitor the Annoying is a classical evil wizard in design, being an elderly man with a long white beard and dressed in dark robes - he also carries a large staff that has a multi-sided dice in place of the usual mystic gem found in such staffs, a symbol of his math-based magic.