The leg was given to her by her mother, Roxanne Vandelay, the CEO of their family's company. Sometime before the events of the game, Peppermint received an injury which caused her to get a robotic leg.

Though at the start of the game she is unsympathetic and hotheaded, as described offscreen by CNMN, over time she learns to be more levelheaded and less aggressive with coordinating the team. Because of this, she has a tendency to give him a hard time, but it often serves as the focus that he needs to help keep the mission on track. Unlike 808, she is annoyed by Chai's antics and is sometimes enraged by him, and doesn't tolerate puns from anyone in the vicinity. Peppermint is as spunky, determined, and smart as they come and filled with snark, but while she can be tough and have a short temper, she has a big heart. She also has a buckle containing golden tools and a strap with a long, black belt. Peppermint also wears blue denim shorts and a white thigh high for her organic leg. In her default outfit, Peppermint normally appears with a short blue jacket and a white crop top, donning fingerless brown gloves and white wristbands. She also has green eyes with her right eyebrow being trimmed. Peppermint has side-shaved hair, with blue highlights at the end. Peppermint is a tanned-skin girl with a pink robotic prosthetic leg. Peppermint herself is equally helpful, able to tag in to assist Chai with a volley of laser blasts to juggle enemies, overload barriers or even hit out-of-reach switches in the environment.' ―Character profile on the Hi-Fi Rush website Highly talented in robotics, Peppermint is the mind behind 808, an adorable cat-drone that provides Chai support both in and out of battle.

Mimosa hi-fi rush