Biko Daitokuji, also widely known as B-ko, is a central figure in the Project A-ko series, including the alternate continuity presented in Project A-ko: Uncivil Wars, also known as A-ko the Versus. In this iteration, her character is reimagined, shifting from her role as a wealthy high school antagonist to a more pragmatic, though still fiercely competitive, young adult. Her background is rooted in immense privilege as the heiress to the powerful Daitokuji Financial Group, a corporation known for its advanced defense technology. This version of Biko is aged up, typically portrayed as being between nineteen and twenty-one years old, and the familiar school setting of Graviton High is absent, replaced by a harsh desert planet where she works as a bounty hunter.

In Uncivil Wars, Biko's personality retains her core traits of arrogance, high intelligence, and a volatile temper, but they are filtered through a more mature and survival-oriented lens. She is no longer a spoiled student but a capable and resourceful operator. Her motivations are also significantly altered. The obsessive, possessive fixation on her classmate Shiiko Kotobuki, known as C-ko, that defined her in the original films is almost entirely gone. Instead, her primary motivation appears to be pragmatic, often driven by profit and survival in her bounty hunting work. The central rivalry with Eiko Magami, or A-ko, is still present, but it has evolved from a schoolgirl feud into a grudging and competitive partnership of vitriolic allies.

Her role in the story of Uncivil Wars is that of a co-protagonist and reluctant partner to her former nemesis, A-ko. Together, they navigate their desert environment, taking on jobs to make a living. The plot is set in motion when C-ko, now the daughter of a galactic corporate executive, crash-lands near them after being kidnapped by space pirates. This event forces Biko to team up directly with A-ko to rescue C-ko, pitting them against the pirate leader, Gail, and other threats like the cultist Xena. This partnership is central to the narrative, and her dynamic with A-ko is a key relationship, defined by constant competition, bickering, and a begrudging respect that allows them to work together effectively when necessary. Another significant shift for Biko in this continuity is her romantic interest; she develops an attraction to the male space pirate Gail, moving away from the same-sex-coded obsession of the original series. Her relationships with her traditional subordinates, the four girls Mari, Asa, Iné, and Umé, are not a prominent feature of this version's story.

Biko Daitokuji's most notable and defining ability remains her genius-level intellect and her unparalleled skill in engineering and robotics. Even in the alternate setting of Uncivil Wars, her technological prowess is undiminished. She is capable of designing and constructing complex mecha and combat suits, often in an astonishingly short amount of time. Her signature creation, the powerful and revealing Akagiyama-23 battlesuit, remains a key part of her arsenal. This suit grants her superhuman strength, speed, the ability to fly, and an array of weapons including wrist-mounted missiles and an energy whip, allowing her to fight on par with the superhuman A-ko. Her resourcefulness extends to repairing alien spacecraft, a feat she accomplishes in a single evening, demonstrating that her technical genius is her most valuable asset regardless of the universe she inhabits. This combination of a sharp mind, a volatile ego, and extraordinary engineering skill defines her character, making her a formidable force whether as a spoiled rich girl or a hardened desert bounty hunter.