* ''Roleplay/DestroyTheGodmodder'' has a fairly obvious one. The Godmodder. This isn't completely the case in the second one, where some of the screwiness seems to have a little grounding outside of the Godmodder's influence, but everything in the first game was at least indirectly the Godmodder's fault.
* ''Roleplay/WeAreAllPokemonTrainers'':
** Missingno, also called The Anomaly and He Who Must Not Be Numbered.
** 'M in the Unova arc.
** [[BiggerBad Ardos]] in the Ranger Regions.
** Napoleon in the Alternate Timeline.
*** [[ThanatosGambit DAMN IT, NAPOLEON!!!]]
** Annoski during the Keystone arc.
** [[VideoGame/{{Fallout 1}} The Master]] and [=PEFeDOS=] during PMD-R.
** AU!Alduin in [=RtAU=].
** The Ghost Lord in Conquest.
** Cipher for Unova-2, Holon, and Orre.