A scientist at King’s College who becomes Rosalind's rival, driven by professional insecurity and adherence to patriarchal norms. His actions contribute to the competitive and exclusionary culture that isolates Rosalind.

Researchers characterized by their ambition and competitive nature in the "race" for DNA's structure. They rely on theoretical model-building and exploit Rosalind's research without her permission.

Head of the labo in Paris where Rosalind first finds respect and collaboration, fostering an ideal scientific community. He becomes both a mentor and romantic interest with a personal flaw that impacts Rosalind emotionally.

Rosalind’s assistant and steadfast ally at King’s College, exemplifying respectful collaboration and support. He values Rosalind’s expertise and defends her work, maintaining loyalty despite challenges.

Head of the Biophysics Unit at King’s College who hires Rosalind and fails to manage conflicts between her and Wilkins effectively. His ambition for the unit prioritizes results over staff well-being.

Rosalind’s friends and intellectual allies in Paris who provide emotional and professional support, representing a supportive community. Adrienne is a role model for work-life balance, and Vittorio advises Rosalind on safeguarding her scientific integrity.

Rosalind’s collaborators at Birkbeck College who create a fulfilling scientific partnership characterized by mutual respect and productive debate. Aaron is her intellectual equal, while Don offers her admiration as a scientist and a person.