The main cast—John Nettles as DCI Tom Barnaby, Daniel Casey as DS Gavin Troy, Jane Wymark as Joyce Barnaby, and Laura Howard as Cully Barnaby—is entirely white and British, reflecting the authentic rural English village setting without any forced diversity, race-swapping, or gender alterations. Guest casts in episodes like 'Death's Shadow' (property developer murder tied to past child death), 'Strangler's Wood' (serial killings linked to tobacco industry secrets), 'Dead Man's Eleven' (cricket match disrupted by quarry-related grudges), and 'Blood Will Out' (magistrate killed amid tensions with travellers) feature no prominent non-white, LGBTQ+, or otherwise identity-focused characters; any minor ethnic elements, such as travellers (didicoys), are portrayed stereotypically and problematically by modern standards, not progressively.

Themes center on personal vendettas, family secrets, and village hypocrisies, with incidental domestic abuse in one episode treated as individual crime, not systemic patriarchy critique. No creator intent for activism, no lectures on social justice, and audience reception praises early seasons precisely for their pre-woke purity, contrasting sharply with backlash against later seasons' DEI insertions.