If one pays attention to the characters on Big Mouth, they will notice the characters have a unique design in their eyes. Every living creature on the show have these "gemstone eyes" consisting of 3 (or sometimes 4) shades of a specific color divided into a pentagon formation.
Eye Color Shades
- Cerulean - Hormone Monstress
- Cornflower - Nick Birch, Elliot Birch, Leah Birch, Matthew
- Heather Blue - Barbara Glouberman
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