The season incorporates explicit queer elements through Jo's confirmed sexuality, her ex's accusations of infidelity involving DI Kate Fleming, and interpersonal tension between Kate and Jo that includes intimate hand-brushing and longing glances. These dynamics function as significant narrative threads and fan focus points, culminating in Jo's witness-protection ending alongside a female partner.

Creator Jed Mercurio noted that COVID protocols restricted intended physical intimacy in these arcs, confirming deliberate emphasis on the relationships as subplots rather than incidental details. Thematic centrality remains moderate because the queer elements drive character motivations and twists without becoming the core premise of police corruption. Casting introduces diverse actors in supporting modern UK police roles without any race or gender swaps of established characters, keeping that aspect organic.

Audience reception signals include widespread fan speculation around the Kate-Jo pairing, often labeled 'Flemson' shipping, which elevated the interpersonal tension to a notable secondary focus. This combination of explicit lead representation, queerbaiting dynamics, and organic supporting diversity produces a score of 5 rather than higher or lower.