Ruby Armstrong is a 15-year-old girl who works as a professional bully. She has fair skin, blue eyes, and shoulder-length blonde hair. People pay her to harass, assault, beat up, insult, demean, and bully them. Although naturally sweet, chill, easygoing, and friendly, Ruby can put on a convincing rude, aggressive, mean, cruel, spiteful, and sadistic act when working. In either persona, Ruby has an assertive and confident aura.