'''Basic Trope''': This person was once a hero until something ''very bad'' occurred.
* '''Straight''': Bob was once a KnightErrant until he found that his DoomedHometown was burned while he was away. He's lived as a lowly drunkard ever since.
* '''Exaggerated''': Alice was once an AllLovingHero with a ThouShaltNotKill policy. Then, [[DeadlyDecadentCourt the court]] made an agreement with [[BigBad Emperor Evulz]] and branded her party as traitors. After [[SoleSurvivor she escapes from the siege alone]], Alice found that her [[TheCutie little sister]] was killed by the [[HumansAreBastards villagers, who feared that the army might attack them as well]]. [[BreakTheCutie These events]] turned her into a villain to which Evulz [[EvilerThanThou can't even be compared]].
* '''Downplayed''': Bob stops being so nice.
* '''Justified''': The events topple the very ideals held by the character. [[HeroicBSOD Traumatized]], her mental state is irrevocably shattered.
* '''Inverted''':
** ReformedCriminal
** TheAtoner
* '''Subverted''':
** Bob may be a drunkard, but he will agree to help if TheHero needs him.
** Bob was a FakeUltimateHero and was never a good person to begin with.
** Bob is just as competent a hero, [[DrunkenMaster if not moreso, whilst drunk.]]
** Alice is a NobleDemon and much more likable when compared to other villains.
* '''Double Subverted''': Alice has PetTheDog moments every so often, but decides that her deeds are NecessarilyEvil and sticks to them.
* '''Parodied''': [[EvilIsPetty After the court forgot to invite her to the national ball, Alice decided to lead Evulz' troops to curbstomp the country before summoning Hell on earth]].
* '''Zig Zagged''': Alice was a hero until she was betrayed by her country and fell. However, it turns out that she still regularly performs heroic deeds and only ''appears'' to be evil. However, ''that'' turns out to be an act, and she is actually planning total destruction. But it turns out that she was a WellIntentionedExtremist. Then another betrayal plunges her into true villainy.
* '''Averted''': Bob and Alice continue to hold their beliefs and become {{Failure Knight}}s [[KnightInSourArmor In Sour Armor]].
* '''Enforced''': [[CryForTheDevil Despite all the evil acts, Alice is the fan favorite. So the producer decides to make her into a more sympathetic character by laying out her]] StartOfDarkness.
* '''Lampshaded''': (to TheHero) "You're just like Alice. If it wasn't for that day..."
* '''Invoked''': See Exploited.
* '''Exploited''': Evulz' engineers Bob's/Alice's downfall to make him/her his champion.
* '''Defied''': The ghost of Alice's little sister chastises her as she begins considering taking the dark path, snapping Alice to her senses.
* '''Discussed''': ???
* '''Conversed''': ???
* '''Deconstructed''': As a hero, who's been the best the world had to offer and decided being good was worthless, Bob is worse than any standard villain. Additionally, when he falls, [[TheParagonAlwaysRebels he takes many others like him down with him, either because he has convinced them to agree with him or they are just disillusioned that their hero could do this]].
* '''Reconstructed''': The idealistic Dean decided to make Bob remember what it's like to be Good, with [[GetAHoldOfYourselfMan good old Good-powered chainsaw fisticuffs to the jaw]].
* '''Played For Laughs''': Aside from being {{Ungrateful Bastard}}s, everyone is also retarded enough to fall for reasoning that wouldn't convince an eskimo to buy ice. That being the case, Bob/Alice, the most {{Obviously Evil}} villain imaginable and being known world-wide for her moral downfall, manages to persuade everyone to start a war against each other.
* '''Played For Drama''': Bob/Alice takes delight on taking horrifying vengeance on his former friends, aware how agonizing they are finding his/her chain of retaliations.
Stop, turn back, don't go down the path of the FallenHero.
%% Optional items, added after Conversed, at your discretion:
%%* '''Implied''': ???
%%* '''Plotted A Good Waste''': ???