* EnsembleDarkhorse: The series started with protagonist Bob Shirt, before Wendy Welding eventually became the focus and Bob was completely phased out. A similar fate eventually befell Wendy after the introduction of Dethany, who became so focal to the strip that Bill began having a woman cosplay as her at convention appearances and Sunday strips now display the title as "On the Fasttrack, Featuring Dethany".
* FridgeHorror[=/=]NightmareFuel: The Moat Monster once [[SwallowedWhole ate]] the [[MillenniumBug [=Y2K=] Bug]] and seemed to find him tasty, but he was just fine the next day....
** Addressed more directly later. Such recurrence might make him [[WhoWantsToLiveForever wish he weren't immortal]].
* JerkassWoobie: Fi wasn't always dour and unfriendly. It took a [[DarkAndTroubledPast harsh experience]] to change her.
* TheScrappy: InUniverse, Autocorrect. [[TruthInTelevision Much as we tend to hate the real feature.]]
** RescuedFromTheScrappyHeap: She's getting there as characters show her more and more compassion.