Pyronica

Pyronica is a character in Gravity Falls, appearing in the episode "Weirdmageddon Part 1." She is an old friend of Bill Cipher and is part of The Gang of Interdimensional Criminals and Nightmares. She was, along with Bill and the rest of the gang, trapped in her decaying dimension, but was finally set free when the rift between the dimensions cracked during the prophicised Weirdmageddon.

Appearance
Pyronica is a glowing pink demon with a big head, adorned by short pink hair, with bangs parted across her face, and several small horns across her skull, inbetween two other big curved horns. She has a big eye in the middle of her head, just above her wide mouth and thick lips, that hide her buck theeth and fangs combo, inside her mouth.

She has a humanoid slim body, and her legs and arms are made of white flames. She also wears a tight pit hot pink body suit and a long pink cape.

Trivia

 * The designer for Pyronica has stated she was designed to represent a personification of Bill's blue flame.