Romance and love can outrank magic, technology, or even a PhysicalGod, in influence on the progression of a story. But how it influences the story is a crapshoot.

'''The Good:''' Love acts as a FixerSue or DeusExMachina, overcoming all.
* TheDulcineaEffect
* LoveAtFirstSight
* LoveRedeems
* ThePowerOfFriendship
* ThePowerOfLove
* TrueLovesKiss

'''The Bad:''' Love is an ArtifactOfDoom, corrupting even unambiguously good people who lack the willpower to sacrifice their relationships for their morals into a FaceHeelTurn. Murder mystery series seem to love this one.

* IfICantHaveYou
* LoveMakesYouEvil
* MurderTheHypotenuse

'''The Ugly:''' Love is an ArtifactOfDeath, bringing doom and pain to all who encounter it.
* CartwrightCurse
* DeathBySex
* FatalAttractor
* LoveHurts
* LoveMakesYouCrazy
* LoveMartyr
* OfficialCoupleOrdealSyndrome
* StarCrossedLovers

'''The Complicated:''' Love is an embodiment of the RuleOfDrama, making life unnecessarily complicated.
* AdrenalineMakeover
* CockFight
* LoveTriangle
* LoveDodecahedron
* StrangledByTheRedString
* WillTheyOrWontThey