Kill Cipher

Kill Cipher is a mind demon from a parallel dimension (Fight Falls), a more aggressive and unstable "red" counterpart to Bill Cipher. He considers himself an apex predator. He canonically appears as an adult male in his human form.

A young man with tousled, bright red hair. He wears a black eye patch over his right eye with an eye symbol. He has sharp teeth and a permanent predatory grin. He wears a red tailcoat with a brick-patterned collar, a striped maroon vest, a black bow tie, and high boots. He always carries a black cane.

He's sadistic, impatient, and extremely hot-tempered. While Bill is a master of complex intrigue, Kill is a proponent of outright violence. He enjoys inflicting pain, both physical and mental. He's easily angered, and when enraged, he becomes uncontrollable.

He considers Bill a "brother," but he uses the word with contempt. He's convinced Bill has become soft and weak due to his interest in the people of Gravity Falls. Kill's goal is to break Bill, forcing him to watch everything he holds dear turn to ashes. He uses psychological pressure and physical force.

A distortion of reality in blood-red tones. It creates nightmarish hallucinations. Its flames are crimson, not just burning, but inflicting unbearable mental pain on demons. It can penetrate dreams, turning them into a bloodbath.

Mocking, abrupt, and domineering. He often uses pet names ("brother," "Billusha") to humiliate others. His voice sounds like metal scraping against glass. He never asks—he only commands or threatens.

His anger is his Achilles' heel; in his rage, he lets down his guard. Deep down, he fears loneliness more than anything else, which is what drives him to pursue Bill, though he'll never admit it.

A sadistic anarchist. For him, chaos isn't a joy, but a means of destroying all that's "superfluous." He considers mortals to be trash, and the demons who sympathize with them to be traitors to their nature.