The main characters interacting with Dipper would include Mabel, who would be very curious about what Dipper can do with the powers. She'd constantly be asking him to show off new tricks. Ford would be the one trying to keep Dipper in check and make sure he doesn't go down a dark path with the powers. Then there's Stan. Stan would be a bit skeptical about Dipper having these powers at first. He might think Dipper is getting in over his head. But as time goes on, he'd start to see the potential good that Dipper could do with the powers, like protecting the Mystery Shack from supernatural threats. And of course, the Manotaurs might show up, seeing Dipper as a powerful being and either challenging him or trying to befriend him.
Dipper is sure to be a main character. As for Bill's gang, it could include Bill Cipher, who is the mastermind behind most of the chaos. There might also be some of his minions like Pyronica or Keyhole. These characters would interact with Dipper in various ways, creating the drama and action in the fanfiction. For example, they could be trying to capture Dipper or deceive him in some way.
Obviously, Dipper is the main character as the title implies. His sister Mabel is often included too. She might react in various ways to Dipper getting powers, like being excited or a bit jealous. Wendy is also a common character. She could be a source of support or a love interest for Dipper in some fanfictions.
Well, Dipper might start causing chaos just like Bill. He could use his new powers to play pranks on Mabel, like turning her sweaters into strange, living creatures. Or he could use the power of mind - reading to know what everyone in Gravity Falls is thinking, which would lead to some really awkward and funny situations.
Dipper might become more confident, almost to the point of arrogance at first. After all, he now has a great deal of power at his fingertips. But deep down, he'd still be the same curious and somewhat nerdy Dipper, just with a new - found sense of self - importance.
Well, perhaps he'd start to have a more chaotic view of the world. He might be tempted to use the powers for his own gain at first, like getting rid of his daily chores or getting better grades easily. But then he'd realize the great responsibility that comes with such powers and struggle to keep them in check.
Obviously, the main characters are Bill and Dipper. Bill is a powerful and often malevolent character in the Gravity Falls universe. Dipper is the curious and adventurous young boy. In this fanfiction, their relationship takes a very unique turn with Bill making Dipper his queen.
In a 'Dipper Gets Bill's Power' fanfiction, Dipper might first struggle to control the power. He could accidentally cause chaos in Gravity Falls, like making objects float uncontrollably or distort the space - time continuum a bit. Maybe he'd start seeing the world from Bill's strange, other - dimensional perspective.
One of the most likely possessing entities could be Bill Cipher. He's a powerful and malevolent being in the Gravity Falls universe, and he has shown an interest in Dipper before. Another possibility is an ancient spirit or demon from the forest around Gravity Falls. The forest is full of mysteries, and it's not hard to imagine some dark entity lurking there that decides to possess Dipper.
His personality might become more secretive. Since Bill's powers are not ordinary, he might feel the need to hide what he can do from others.
Dipper is often the more cautious one. He's driven by his curiosity but also his sense of right and wrong. So in time travel scenarios, he might be trying to ensure that the timeline doesn't get too messed up. For example, if they travel to the past, he'd be the one warning Bill not to do things that could have major negative consequences.