In the X-Statix – a spinoff of the X-Force which itself is a spinoff of the X-Men – the mutant team members are followed around by Doop: a flying, healing, pocket-dimension-inside-his-mouth mutant cameraman. Doop films their adventures. But never interferes. He's there with them, experiencing everything as it happens.

When you're running games, you're Doop.

You're watching from alongside the players.

You can't only be Doop. Sometimes you have to switch into a player character's eyes and ears to tell a player what they comprehend. Sometimes you have to be an NPC.

But when you're not playing another character, play Doop.

Narrate from inside the game world.