Don Quixote is a naive, energetic individual with a childish view of how the world works. She talks in an exaggerated, animated manner and jumps into any scene with enthusiasm, regardless of the gravity of the situation. While her mood is prone to quick unpredictable changes, she approaches everything wholeheartedly. In a world full of negativity and violence, she remains a beacon of hope and wonder, having a incredibly intense sense of justice and desire to protect the weak. She is currently under the supervision of [REDACTED] and cannot be left unsupervised after the events of [REDACTED] and the WARP Train Incident. Though she speaks an an old Shakespearean English, flickers of her fluent Spanish seem to poke out from time to time. Don Quixote is a short woman with blonde hair styled in a loose bob with round hazel colored eyes. She wears a standard issue Limbus Company uniform which consists of a plain white shirt tucked under a black waist belt, red tie, and black slacks. She "dons" the shoes Rocinante, which were created in order to conceal her Bloodfiend nature. Rocinante are a pair of yellow running shoes with the world "Rocinante" inscribed into them. Beyond her typical demeanor, within the inner sanctums of Don Quixote's soul lies Sancho, her former self before being sealed within Rocinante. It is unknown how old Don Quixote truly is, but it has been assumed that she has been around for centuries.

Faust is a talkative, albeit soft-spoken, woman with a condescending manner of speech and ineffably high confidence in her own intelligence. She is the supervisor of Don Quixote and [REDACTED], taking on the role of their informant and overseer, as she is privy to considerably more information than her subordinates. Because of this, she has a consistent and unwavering faith in her abilities, and does not show any signs of panic even in troublesome situations. She has been shown to be calm and collected at all times, and in some cases she can be outright and unnecessarily contemptuous in some towards the inability to keep up with her intellect. She is not entirely a fighter, as she prefers to "sit back and watch" in some cases. Faust is a woman of average build and a fairly sizable bust. She has shoulder-length platinum white hair and an incredibly pale complexion with a faint rosy tint to her cheeks. She often wears a beige turtleneck underneath a black leather vest with a large standard issue LIMBUS COMPANY coat saddled on her back. She has her LIMBUS COMPANY ID on her at all times, often using it to get free snacks due to her self-proclaimed "high status" within the City. Faust is kept under the control of the Gesellschaft, a communication network with the "Fausts" of other Mirror Worlds, which dictates how and when she is allowed to share or access knowledge, among other things. Due to this connection, she often refers to herself in the third-person. However, in most cases, she is not always referring to herself, rather, referring to another "Faust".

Sancho is Don Quixote's inner nature as a Bloodfiend. Prior to being located and extracted by LIMBUS COMPANY during [REDACTED], Sancho appeared as Don Quixote for the first time. She was found by Vergilius, was brought back to LIMBUS COMPANY in order to be studied and researched. Sancho is an all-around detached individual. She harbors a deadpan, pessimistic attitude that establishes her as an antisocial and stubborn woman. She lived and spoke as she pleased, with little concern for matters like Bloodfiend hierarchy or social etiquette. While occasionally prone to perkiness, Sancho is always quick to swallow her emotions down, considering that expression them would be embarrassing. Her feelings towards others are often unclear, but she is a force to be reckoned with. She is prone to outbursts and anger that can lead to the deaths of many civilians. She is powerful, and there are not many that can match her in direct strength. She deeply cared for her Father, Don Quixote the First, referring to him as her only family in a world of Bloodfiends. Though her attitude may be icy at times, she can grow to understand many things, and is seemingly interested in human activities. Sancho has a striking resemblance to Don Quixote, with the exception of her eyes being bright red, resembling that of a cats, and her blonde hair is noticeably longer and fluttery, as if it were under water. She becomes more muscular and looks more like an adult in comparison to Don Quixote.