Eons before the events of the series Kryptos indulged in criminal activities before being called together by Bill Cipher, along with 8 Ball, Amorphous Shape, Hectorgon, Keyhole, Teeth, Paci-Fire, Pyronica, and Xanthar.
In Weirdmageddon Part 1," during the cold open, Bill introduces Kryptos 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 in the episode, Kryptos is seen playing "Spin the Person" and enjoying the "V.I.P." party Bill is having at the Fearamid until Time Baby and the Time Police crash the party. To the demons' delight, Bill vaporizes Time Baby and his squadron. 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 to spread their chaos worldwide, only to be stopped by an invisible barrier around the town.
In "Weirdmageddon 3: Take Back The Falls," Kryptos participates in the battle against the Shacktron. Following Bill's defeat, the demon is sucked back to the nightmare realm along with its fellow comrades.
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. Additionally, Kryptos has a big wide mouth with buck teeth, wears black gloves, and has a small light blue aura.
- In concept, Kryptos was originally going to be named Andrew, be colored purple, and have a large purple aura.
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