Vs Battle

Bill Cipher Vs Flowey The Flower

             (Gravity Falls Vs Undertale)

- Both are insane creatures who just want to cause chaos

- Both have yellow in their design

Bill Cipher

Abilities

In Mindscape:

As Bill can't access the third dimension physically at first, summoning him seems to put the people around him into a sleep-like trance that allows him to manifest. The people observing are unaware they've fallen asleep until Bill leaves, after which they usually awake with a jolt. Bill can also enter another person's mind through that person's dreams.

Once within the trance, or within someone's mindscape, Bill's powers are vastly magnified; he becomes capable of changing his appearance, changing the appearance of other people's dream selves, and changing the area at will. He can also pluck information from any others who are also inside and bring those ideas and images to life, as was the case with Xyler and Craz. Bill can communicate with his summoner using his body as the screen of a video phone; he can also use his whole body as a projector, displaying past and future events as live video footage.

As Bill often mentions, he is close to omniscient: he knows the truth of many well-known conspiracies and can see the future (such as the destruction of the Gideon-bot and that Gideon Gleeful would go to prison), an ability he often flaunts by offering to tell a person the exact time, date and cause of that person's death - he seemingly predicted Ford's death, by heart attack at the age of 92, upon first meeting him. Bill has the ability to see things through the eyes of any image of himself, which is why his image appears hidden throughout many items and places in Gravity Falls.

Bill also has the ability to, with the original owner's consent to an appropriately worded "deal," remove people's minds from their bodies, taking possession of the empty body himself. The real owner of the body is stuck in a ghost-like form within the mindscape, unable to affect the rest of the world unless that person finds a vessel. This vessel doesn't have to be a living thing, as revealed when Dipper used a puppet of himself to communicate with Mabel while stuck as a disembodied spirit.
Despite his vast knowledge and abilities, Bill has limitations. He must be summoned in order to appear first: he vanished from Gravity Falls once Ford disappeared, and only manifested again after Gideon summoned him once more, even remarking that he hadn't been there "in a while." He can only access bodies and conscious minds if he is allowed to through a contract, which involves agreeing to certain terms and shaking Bill's hand. Being well aware of this, Bill is known to twist and manipulate the words of these contracts for his benefit. When taking possession of a mortal body, Bill becomes limited to it, subject to pain (which he finds "hilarious"), exhaustion, and even the host body's particularities, as evidenced when he was shown to react to Dipper's ticklish areas while in Dipper's body.

His vast powers are also strictly limited to dreams and the mindscape: his powers do not migrate into his host body and can't affect the physical world.

In Physical Form

After smashing the inter-dimensional rift and creating a gateway from the Nightmare Realm, Bill became incarnate, which allowed him to both exist and affect the real world.

In his physical form, Bill is nigh-omnipotent, bringing inanimate objects to life and turning people into statues of the material of his choice. He can regenerate every aspect of himself, create everything from objects to elaborate pocket dimensions (like Mabel's prison bubble) and produce electric charges (shot from his eye). His abilities in this form also include: apportation, inter-universal travel, matter manipulation, telekinesis, pyrokinesis, time manipulation, telepathy, mind control, illusion manipulation, dream manipulation, nightmare inducement, madness inducement (can create bubbles that induce madness in whatever they touch), clairvoyance, objects summoning, intangibility, reality-warping, levitation, possession, precognition, size-shifting, fourth wall awareness (he is aware of the real world and can "see" us), and resistance to reality-warping and space-time manipulation. He even surpasses Time Baby's powers, which he displays by disintegrating him during "Weirdmageddon Part 1." Bill himself declares that he controls space, matter and, after getting Time Baby out of the way, time itself.