Hilda navigates troll society, encounters the Mountain King, and reunites with her mother Johanna (Daisy Haggard) to break the spell and avert conflict between Trolberg humans and trolls. Core themes focus on mother-child bonds, not judging by appearances, and recognizing individuals vary within groups—classic fantasy tropes drawn from Scandinavian folklore rather than modern identity politics.

No established characters undergo race, gender, or sexuality swaps; new troll characters and human friends Frida (Ameerah Falzon-Ojo) and David (Oliver Nelson) fit the series' existing world without narrative justification issues. Creator statements and production emphasize adventure and emotional storytelling, with no activist framing.

Reception highlights positive family messages and visuals, with minimal audience pushback labeling it ideological; one Rotten Tomatoes note calls the acceptance theme familiar but not intrusive. Minor casting diversity among voice actors remains incidental and does not alter premise or arcs.