The main Peppercorns—Emma Krogmann, Max Paulsen, Nina Pellicano, and Henri Patterson—are portrayed by white European child actors with no race or gender alterations to prior canon characters. One episode, 'Versklavt,' introduces Sudanese refugee Acai and her mother, who are exploited by a smuggler into selling illegal cigarettes after fleeing war; the group helps resolve their situation through investigation.

This adds incidental diversity via a new guest character and a refugee exploitation subplot, but it functions as a standard crime-of-the-week story rather than a platform for identity politics or systemic critiques. Other episodes address contemporary issues like cyberbullying and school theft without activist framing or lecture-style dialogue.