* EarWorm: many of the Karaoke Cafe songs.
* EnsembleDarkhorse: The Germ Girl from "Adventures in Microbia". It helps that she's voiced by E.G. Daily.
* NightmareFuel: "Farewell, 2 Arms," in which Molly, tired of being weak and breakable, slowly has her body parts replaced with stronger toy parts. From a toy's perspective, that's creepy enough, but then she decides that she wants a new head. [[FaceHeelTurn Mr. Bumpy's head.]]
** She announces this by pulling her head off and throwing it at him.
* UglyCute: Molly and Germ Girl.
* TheWoobie: Squishington is sometimes this, one particular example being in the Christmas special when he feels depressed over his inability to tap dance due to his lack of feet.