Blake is described as being "mellow" by her voice actress, Arryn Zech. She displays a cool, reserved, and serious personality most of the time but does not lack a humorous side usually in the form of dry wit and sarcasm. Blake is a righteous person, respecting other people's lives regardless of whether they are Faunus. She strongly despises those who judge and discriminate based on racial prejudice. Blake is outspoken, going so far as to indirectly insult the Schnee Dust Company in front of its heiress and defend Faunus of any kind.

Blake is shown to be an introvert. Though she reads books to distance herself from the discussion at hand, as the series continues, she is shown to be more facetious and friendly. Blake appears most conversant when discussing the history and plight of her people.

As a Faunus, Blake has faced discrimination in the past and wears a bow when around Humans in order to be treated for her character and not her species. However, despite having no hate for Humans, she has seen how the real world works and wonders how she can undo so many years of hate and pain.