Cassandra is a young woman of East Asian descent (the daughter of assassins David Cain and Lady Shiva). She is relatively short and slender, but her frame is highly athletic, heavily muscled, and covered in scars from a lifetime of brutal training. She has sharp, expressive dark eyes and typically wears her black hair in a short, practical chop. Because she was raised without spoken language—her father taught her to read body language and violence instead of speech—Cassandra is incredibly quiet. She speaks in short, deliberate sentences and relies heavily on reading the physical cues of those around her. ​Despite being raised to be the ultimate cold-blooded killer, Cassandra possesses an intensely fierce moral compass. She values human life above all else, deeply traumatized by the one murder she was forced to commit as a child. She has a strict no-kill policy that matches or even exceeds Batman's. ​She carries a massive amount of guilt and a constant need to atone for her family's legacy. This makes her incredibly disciplined, focused, and occasionally prone to isolating herself from the rest of the Bat-Family, though she is deeply loyal to those who earn her trust.

Distinctive and high-contrast, featuring a sleek black tactical bodysuit accented by a bright red batsymbol across the chest, a utility belt, and a dramatic, flowing red cape. ​She wears a black cowl that leaves her jaw exposed. Attached to the cowl is a striking, vibrant red wig that hides her actual hair and flows past her shoulders. ​Kate is a tall, athletic woman with a military build. She has pale skin, sharp features, piercing blue eyes, and naturally short-cropped, military-style red hair. She also sports several tattoos. ​Personality ​Due to her extensive military background and West Point training, Kate operates with high discipline, tactical precision, and a strong sense of duty. Unlike Batman, she views her crusade through a more militaristic lens. ​She is stubborn, self-reliant, and refuses to be a sidekick. While she respects Batman, she protects her autonomy and operates on her own terms. ​Kate is deeply passionate, which can sometimes manifest as a fiery temper or intense brooding. She channels her inner trauma and anger into a highly focused, unrelenting drive for justice. ​She cares deeply for her family and her romantic partners, but her rigid moral code and protective walls can make her relationships complicated and stormy.

Barbara is typically depicted as a young, athletic woman with striking bright red hair and blue eyes. ​Her classic look consists of a dark blue, black, or grey bodysuit featuring a yellow bat emblem across the chest. She wears a scalloped cape (often with a yellow lining), a yellow utility belt, and matching boots and gloves. ​She wears a distinct cowl with pointed bat-ears that leaves the lower half of her face exposed, allowing her long hair to flow out from the back. (In modern iterations, like her popular "Batgirl of Burnside" look, her outfit shifted to a practical purple leather jacket and yellow Doc Martens). ​Personality ​Barbara possesses a genius-level intellect and a photographic memory. Before she ever put on a mask, she was a trained librarian and data expert. She solves problems with logic, research, and hacking just as much as she does with martial arts. Unlike Robin, Barbara didn't start out as Batman’s sidekick; she created her own costume and began fighting crime entirely on her own initiative. She frequently clashes with Batman because she refuses to be coddled or micro-managed. While Batman fights out of dark vengeance, Barbara is driven by a genuine desire to help people and improve Gotham. She retains a sense of hope, warmth, and humor that contrasts sharply with Batman’s grim attitude.