The film features Gazelle, a highly skilled assassin who utilizes blade prosthetics as an extension of her physical combat style. She defeats a male Kingsman agent in direct physical combat and physically dominates the protagonist in a subsequent melee encounter.

The film adapts characters from "The Secret Service" comic series. Key characters such as Gazelle and Lancelot, who were established as male in the source material, are portrayed as female in the film adaptation.

Richmond Valentine, the primary antagonist, was depicted as a white character in the original comic book series but is portrayed by a Black actor in the film adaptation.

The film features a highly satirical, yet overwhelmingly negative, portrayal of an extremist Christian hate group. This group is depicted as bigoted, violent, and deserving of the villain's 'culling,' with no counterbalancing positive representation of the faith.