As an insult, NPC paints a person as a background character in someone else's game: repeating talking points, following trends without thought, existing on autopilot. "NPC behavior" and "NPC moment" describe acting predictable or scripted, and "side character energy" is a softer cousin.
NPC streaming flipped the insult into a genre. Creators like PinkyDoll went viral on TikTok Live performing canned responses ("ice cream so good") whenever viewers sent gifts, earning thousands per stream. The format is part performance art, part tip-farming, and made NPC a creator-economy term as much as a slang one.
