All There in the Manual: A lot of background information is dubiously revealed or implied by his Character Blog on Reddit.Ain't Too Proud to Beg: Bill pleads for his life against Stanley in the latters mind, promising him riches, galaxies, the whole works just for his life to be spared, only to be obliterated right after.And all murals and flashbacks make it clear that, over the course of human history, he hasn't aged a day. The Ageless: He was trapped in his dimension for one trillion years, making him way way older than our universe.Action Figure Speech: When speaking, his body flashes slightly due to having no visible mouth.The Future', a gateway finally opens for them to the physical world, with the Nightmare Realm visible on the other side. Naturally, they want out, and in 'Dipper and Mabel vs. Not only this, but Bill describes his dimension as 'decaying'. It is populated by many other Eldritch Abominations, who have been trapped there for one trillion years or more.

Acid-Trip Dimension: His home realm of existence, the Nightmare Realm.Despite all of his reality-shattering power, he cannot break out of the weirdness-attracting field. Whatever force that's responsible for turning Gravity Falls into the haven for weirdness it is is apparently stronger than Bill.This ends up being his final fate at the hands of Stanley. If Bill can't get out of the mind as it's being wiped, forced or not? He gets erased along with it, or weakened enough that the mind's subconscious can finish him off.'The Last Mabelcorn' reveals two more: Unicorn hair can act as a barrier to his magic, and in a quite ironic twist, the memory erasing gun McGucket created to get Bill's horrors out of his head turns out to also be a handy way to kick him out of a person he's possessing.No longer harboring the abilities of 'a being of pure energy' and having to follow the limitations of a human body is a major drawback. Possessing a human gives Bill a new form of power in being able to affect the physical realm, but, as Mabel demonstrates in Sock Opera.he is still possessing a human being.Sure, he can manipulate the rules of the deal, or torture them and people they love to pressure them into agreeing, but ultimately, if they still refuse that handshake, there's not much he can do. Bill can possess people, and enter their minds to extract whatever knowledge he wants.but he can only do so if someone willingly shakes his hand and lets him do so.Among other things, this is keeping him from attacking the Time Baby. The one thing that keeps him from being more dangerous is that he's unable to leave the mindscape and doesn't possess a physical form.Achilles' Heel: Despite claiming he has 'no weaknesses,' Bill has quite a few major drawbacks.Above Good and Evil: Suggested heavily by Dipper and Mabel's Guide to Mystery and Nonstop Fun where he writes 'Nostradamus was a hack! Morality is a mental cage designed by the weak! How's Annie?'.

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