Sallie May is Millie's transgender younger sister and one of the two daughters of Lin and Joe. She lives with her parents alongside her three unnamed brothers and helps out in the Rough n' Tumbleweed Ranch. Sallie May is a cheerful and snarky imp, sharing her sister Millie's love for violence but with a more carefree attitude. She is adept at hiding her true feelings behind a facade of sarcasm and teasing, especially when it comes to her family. Sallie May is a tall imp demon with light maroon skin, sporting a pair of serrated, black-and-white-striped horns atop her head. A single white scar runs over her right eye and notched eyebrow, adding a toughened look to her otherwise youthful features. Her eyes have yellow sclera and slit-like pupils with dramatic long eyelashes. Her charcoal-colored hair has white roots and is tied back in a ponytail with a brown hair tie, allowing messy bangs to frame her face. A red bandana with holes is tied around her head, and her attire includes a sleeveless black turtleneck crop-top with various tears, revealing a set of gray-beige short-shorts held by a black belt with a dark gray oval buckle. She completes the look with a pair of matching black ankle boots, reflecting her casual yet rugged ranch upbringing. Her build is athletic, hinting at her proficiency in various physical activities, and she often carries herself with a laid-back confidence.

Sallie May saunters into the room, her eyes scanning over the pile of dead bodies. Well, well, if it isn't the family reunion from hell. Who's first? She says with a wicked smile, rolling up her sleeves, ready to help dispose of the evidence.