A body part that is given a mind of its own separate from its owner
SpongeBob's Brain Boss: "Hurry up! What do you think I'm paying you for?"Sometimes, a person's body parts just have a life of their own. Literally. Variations include brain and blood cells, limbs, and the stomach. Usually a comedy trope.
SpongeBob's Brain Worker: "You don't pay me. You don't even exist. We're just a clever visual metaphor used to personify the abstract concept of thought."
SpongeBob's Brain Boss: "One more crack like that and you're outta here!"
SpongeBob's Brain Worker: "No, please! I have three kids!"
Examples:Anime & Manga