Bill Cipher

Demon Summoning
A black triangle forms before an eye in the middle opens. It then turns yellow as Bill's limbs and hat pop out from the sides and top, respectively. Bill then says "This is going to be fun!" before going into his idle pose as the match starts.

Neutral B - Cipher Wheel
A large circle with icons representing characters in Gravity Falls appears around Bill Cipher. One of the icons begins to glow, then the light passes on from icon to icon until it stops on one. This attack has ten different attacks, depending on what icon the wheel lands on.

Question Mark:
Bill Cipher flashes various images while saying "I know lots of things!", which puts opponents in front of him into the broken-shield status for a short time. This attack deals no damage.

Ice Bag:
Bill Cipher extends his arms and an icy wind shoots out on both sides, dealing fast but weak damage to those in close range and freezing those it hits, similar to the Ice Climber's Icy Breath. This can deal up to 15 damage if the entire attack hits an opponent.

Unknown Symbol:
Bill Cipher fires a small beam of red energy in front of him. This causes moderate knockback and deals 10 damage.

Pine Tree:
Bill Cipher summons a creature from Gravity Falls to attack. A Gnome has a high chance of showing up and is launched similar to an arrow, dealing piercing damage. A Manotaur has a low chance of being summoned, but he has a powerful charge move that will send opponents flying.

Pentagram:
Bill Cipher will use telekinesis to grab the opponent, slam them on the ground and then toss them away. This attack deals 10 damage. 4 per slam and 2 when tossing the opponent.

6-Fingered Hand:
Bill Cipher creates a large hand out of energy and slams it onto opponents in front of him. This attack deals 15 damage if the opponent is in the middle of the attack and 5 if they are at the edge of the attack.

Llama:
Bill Cipher summons the head of Wax Larry King, which will hop on the ground until it touches someone, when it will latch onto them and bite them up to 5 times, dealing 3 damage per bite.

Shooting Star:
Bill Cipher will summon a meteor to fall down in front of him, dealing explosive damage. The meteor deals 10 damage on impact and 5 damage when it explodes.

Stitched Heart:
Bill Cipher will shoot a needle at an opponent, dealing 3 damage. If the needle hits anyone, it will return to Bill, healing him by 3 points.

Glasses:
Bill Cipher will create a large portal, which will shoot a powerful beam of energy, similar to the Unknown Symbol, but with more power, range and knockback. This attack is the least likely to be chosen and will deal 20 damage with high knockback.

Side B - Cipher Dash
Bill Cipher dashes quickly to the side. If Bill collides with an opponent, he will smack them with his cane. Any opponent who is hit will be momentarily stunned. If used in the air, Bill will be unable to attack until he is hit or lands.

Up B - Teleport
Bill Cipher will vanish and reappear above. If a direction is chosen before Bill teleports, he will warp in that direction.

Down B - Hats Off To You
When activated, Bill Cipher will take off his hat, bow, then put it back on and return to normal. If Bill is hit while bowing, he will burst into flame, dealing 5 damage initially, inflicting afterburn for 2 seconds and make the opponent flinch. If Bill is hit while he takes his hat off but before he bows, he will shoot a short-ranged beam of electricity from his eye, stunning the opponent and dealing 3 damage.

Final Smash - Nightmare
Bill yells, "Do you have any idea what I'm like WHEN I'M MAD?!" in a deeper voice while slowly growing to double his original side. He then creates a large portal in the ground that has a powerful vortex effect and lasts for 3 seconds. Any opponent who falls in will find themselves on a large stone head of Gruncle Stan and unable to move. Bill Cipher floats over to the edge and creates a shadow image of a random trapped opponent which uses its final smash move at half the damage before dissipating. Bill then turns red and his eye becomes a large laser cannon, which he uses to fire a large, powerful beam of red energy at the immobile opponents. This beam has the same knockback as a charged smash attack and deals 20 damage.

Up Taunt: Deer Teeth for You!
Bill Cipher juggles 5 deer teeth before tossing them away.

Side Taunt: Insult
Bill Cipher laughs before saying, "It's funny how dumb you are."

Down Taunt: Triangular Dancing
Bill Cipher tap stands on the ground and begins tap dancing.

Victory Option 1 - Cipher Vanish
The cipher used in Bill Cipher's Neutral B forms again around Bill, but the light spins around much faster. The Cipher and Bill grow smaller as Bill says "I'll be watching!"

Victory Option 2 - Dream Demon's Farewell
Bill Cipher says, "That was fun! See you in your nightmares!" before flying off into the distance.

Victory Option 3 - A Friendly Reminder
Bill Cipher says quickly, "Remember: Reality is an illusion, the universe a hologram, buy gold BYE!" before teleporting away.

Failure/Clap - On the bright side...
Bill Cipher exclaims, "Pain is hilarious!"

Up Smash - Hat Attack
Bill Cipher Takes off his hat and swings above him in an arc. This attack does 10 damage when not charged and 15 damage when fully charged.

Side Smash - Cane Smash
Bill Cipher swings his cane from above his head to the direction he is facing and into the ground. This attack does 10 damage when not charged and 20 when fully charged.

Down Smash - Fire Barrier
Bill Cipher extends his arms and fire pillars sprout up around him. This attack deals 15 damage when not charged and 25 when fully charged.

Grabs
Grab - Gotta Hand it to you!

Bill Cipher reaches out and grabs an opponent with a conjured hand made of fire.

Grab attack - Crush

The hand Bill created crushes the opponent for 2 damage.

Up Throw - Deer Teeth, Coming Up!

Bill Cipher makes the hand throw the opponent upwards while he grabs a couple deer teeth and throws them at the now airborne opponent. Each tooth deals 2 damage and the throw itself deals 5

Forward Throw - Telekinetic Slam

Bill Cipher slams the opponent into the ground at an angle, which bounces them away. The throw deals 3 damage and the ground slam deals 5 damage

Backward Throw - Possession

Bill Cipher flies into the grappled opponent before forcing them to hit themselves behind him as he flies back out. The possession deals 3 damage and the opponent's self inflicted damage scales with their neutral standard attack.

Down Throw - Bill makes the hand slam the opponent into the ground before he jumps above them and unleashes a small inferno, dealing rapid damage with an overall damage of 10.

Character Description
Bill Cipher is an omnipresent, yellow, triangular dream demon with unknown motives. He will make a deal with anyone, as long as he gets something he wants in return. Bill is incredibly unpredictable, due to his psychotic insanity and love for inflicting and receiving pain. He finds most things amusing, and is rather outlandish. Bill is both a quick talker and a quick thinker, able to outwit many. He may at first seem weak or annoying, but he is not to be reckoned with. However, he does not know the limits of a mortal body and may find himself removed from his newly possessed body through means of fatigue and severe injury.