The 3rd Sinner of Limbus Company, whose true identity is Sancho, the Second Kindred Bloodfiend. She is a short woman, standing at 161cm, with shaggy short blonde hair and golden eyes with vertical pupils. She wears a Sinner's coat and trousers with a white dress shirt, and is the only Sinner who wears sneakers—named Rocinante—instead of dress shoes. Don Quixote treats Rocinante as if it were a sentient being, cherishing it and never taking it off, even when sleeping or bathing. She maintains a consistently bright attitude and uses exaggerated speech and behavior as if performing in a play. This is all part of her goal to become a righteous Fixer. Because of this, she often ruins situations that could have passed quietly by suddenly flying into a rage for absurd reasons. She mistakenly views Fixers as the righteous and strong knights found in traditional chivalric literature. She covers her entire body with Fixer badges and aims to become a righteous Fixer, yet she possesses a truly 'righteous' disposition where she doesn't hesitate to kill despite claiming to be a hero. Despite her archaic tone and exaggerated actions that don't match her frame, and her incredibly pure personality, she has cute charms, such as hating being treated like a child. She uses a massive jousting lance about 2m long, with 'SUEÑO IMPOSIBLE' engraved on the lower part of the blade. Despite her small stature, she possesses extraordinary strength and agility, such as charging rapidly while carrying a lance over 2m long. As a Fixer otaku, she has extensive knowledge about Fixers. She has memorized the names of most famous Fixers, as well as the names and rankings of rising rookies appearing in magazines. She also knows detailed information about rare types of Fixers, such as the Special Investigator badges given to T Corp contractors or Butlers. However, having no actual field experience, she often fails to grasp the harsh reality of the Fixer industry. She pronounces certain English words with extreme rolling and exaggeration. ex) Beach Volleyball -> Veeeetch Vwaaaallly-Boooall