* CompleteMonster:
** Myth/IncaMythology's ''Literature/HuarochiriManuscript'': [[EvilIsBurningHot Wallallu Qarwinchu]]--God of Fire--is the ArchEnemy of the benevolent Pariacaca and the former ruler god of Huarochiri, where he installed a reign of terror during which local woman were forced to have only two children and to sacrifice one of them to him so he could [[ChildEater devour their flesh and drink their blood]]. Continuing this abominable tradition until the arrival and victory of Pariacaca, Wallallu would be exiled to other lands, where he would continue trying to kill Pariacaca and his family in failed attempts to recover his old power.
** Myth/MayanMythology: The [[FemmeFatale Xtabay]] was once a beautiful and chaste young woman revered for her seeming virtue. In truth a horrible, wicked soul who fouled the ground when she died, she made a [[DealWithTheDevil pact with evil spirits]] to return to life. The Xtabay is a vicious and sadistic SerialKiller who lures in victims to sleep with and violently devour or just brutally murder.
* EnsembleDarkhorse: Inktomi is one of the best known gods of Lakota Mythology, being a MagnificentBastard that's instrumental to human progress. His [[TheTrickster trickster]] characteristics cast him in the central role of numerous fables, and his [[AlternativeCharacterInterpretation ambi]][[DarkIsNotEvil guous]] [[WildCard alignment]] allows him to be both a [[EvilIsCool villain]] ''and'' a [[GuileHero hero]].
* HoYay: Look up 'winkte'. Also other examples.
** Also, the plains custom of [[MyGirlIsASlut sharing wives]]. And of friends sleeping under the same blanket. And on and on.
* MoralEventHorizon:
** [[TheCorrupter Gnaskinyan]] crossed this when he disguised himself as Ksa and corrupted the Pte people, not only defaming Ksa (and contributing to his FaceHeelTurn), but also [[HumansAreFlawed embedding the concept of evil in humanity]]. This moment would also leave humans vulnerable to being corrupted time and time again in the future.
** In Modoc creation myth "When Grizzlies Walked Upright", the Chieftain of the Sky Spirits crosses this when he curses the grizzly bears to walk on all fours, and took away their ability to speak because they had children with his daughter, creating humanity. Keep in mind not only did his daughter truly love the bears and their human offspring, but the grizzly bears are [[UngratefulBastard the reason his daughter is still alive]].
* ValuesDissonance: Smoking as sacred? Today you'd get the American Cancer Society on your ass for even ''suggesting'' that.