Quick answer: NPC (informal conversational) — From “non-player character”: used jokingly for someone acting on autopilot or repeating scripted, predictable phrases. Meanwhile, side quest (Playful · gaming metaphor) — An optional detour from the main objective in a game, or a spontaneous little adventure away from your original plan in everyday life.
1. NPC ↗
Category: Gaming
Register: informal conversational
Regions: US, UK, IE, Online
From “non-player character”: used jokingly for someone acting on autopilot or repeating scripted, predictable phrases.
When it fits: Use “NPC” in casual conversation, messaging, or sociolinguistic discussion when the listener shares the register and context makes the tone unmistakable.
When to avoid: Avoid relying on “NPC” in formal academic, legal, clinical, or HR correspondence where unambiguous plain English prevents misinterpretation.
“Everyone in the group chat recognized “NPC” immediately, even though we had to rephrase it in plain English for the project summary.”
In plain English: Everyone in the chat understood the informal expression (from “non-player character”: used jokingly for someone acting on autopilot or repeating scripted, predictable phrases.), though we used standard wording in the formal report.
2. side quest ↗
Category: Social & memes
Register: Playful · gaming metaphor
Regions: Online
An optional detour from the main objective in a game, or a spontaneous little adventure away from your original plan in everyday life.
When it fits: Use it for an optional task or unexpected adventure whose relationship to the original plan is clear. It adds a playful sense of narrative.
When to avoid: Do not use it to trivialize another person’s main responsibility or assume every unexpected encounter is welcome to everyone involved.
“We went out for coffee and ended up at a pottery class. Excellent side quest.”
In plain English: Our original outing turned into an enjoyable detour.
Test both expressions in context
Quiz yourself on NPC & side quest ↗ Browse all slang comparisons →