Kryptos

Kryptos is a major antagonist of the Disney XD series Gravity Falls. He is a demon and a interdimensional criminal from an unknown dimension and one of Bill Cipher's friends.

Appearance
Kryptos is similar to Bill, as in Kryptos is also a floating shape with black limbs. However, it is a navy colored rhombus, and the top perimeter of its shape resembles a compass, with a functioning eye at the turning point, and the bottom perimeter resembles a square ruler, which is a widely known symbol of the Freemasons. Additionally, Kryptos has a big wide mouth with buck teeth, wears black gloves, and has a small light blue aura.

Background
Eons before the events of the series, Kryptos commited crimes before being called together by Bill Cipher, along with 8 Ball, Amorphous Shape, Hectorgon, Keyhole, Xanthar, Pacifier, Pyronica, and Teeth.

Season 2
In Weirdmageddon Part 1," Bill introduces Kryptos along with the rest of his demon friends to the residents of Gravity Falls. Afterwards, on Main Street, Kryptos and the other demons watch Bill turn Ford into a golden statue and taunt Dipper before burning the journals. Later on, Kryptos is seen playing "Spin the Person" and enjoying the party Bill is having at the Fearamid until Time Baby and the Time Police invaded the Fearamid, but to the demons delight Bill vaporizes Time Baby and his squadron except Blendin. The party then continues as Kryptos and the other demons rejoice over Time Baby's presumed death.

In "Weirdmageddon 2: Escape From Reality," Kryptos and the rest of Bill's minions attempt to leave Gravity Falls and spread chaos across the world, but are stopped by an invisible barrier which makes Bill considers getting Ford 'out of retirement'.

In "Weirdmageddon 3: Take Back The Falls", he along with Bill's minions attacked the Shack-tron during the giant monster fight. But was defeated by the Shack-tron. He was sucked back to the nightmare realm following Bill's defeat along with the rest of the nightmares.