History Main / Lunacy

* ''Manga/FairyTail100YearsQuest'': The Moon [[DragonsAreDivine Dragon God]] Selene has this as her Dragon Slayer Magic. She can create an artificial moon at will which she can [[WeaponizedTeleportation teleport beings at will with]] and can forcibly turn day to night while using her powers. She molds lunar light into various forms such as beams, fire, [[SwordBeam blades]], [[ShapingYourAttacks various constructs]], explosions, and when she's serious she can make the actual moon ''grow in size''.

* ''LightNovel/ACertainMagicalIndex'':

* In ''LightNovel/TheDevilIsAPartTimer'', the angel Sariel is powered up by the moon. He can power up even more by ''drawing the moon closer to Earth''.

** ''VideoGame/FinalFantasyXIV: Stormblood'' has a notable endgame boss with a moon motif: [[spoiler:Tsukuyomi, a primal summoned by Yotsuyu crossing the DespairEventHorizon and going on a small-scale SuicidealCosmicTemperTantrum. Her body is half abalaster white and half obsidian black to represent the full and new moon, and one of her attacks divides the battlefield in half, black and white, with the player's lunar phase status increasing towards one color or the other the longer they stand on one side, potentially killing them if they don't switch sides.]]

* ''VideoGame/Killer7'': There are some shots of the [[WeirdMoom moon quivering and pulsating]] to an ominous soundtrack whenever a chapter starts or a file is loaded. While the moon inserts are never formally addressed, they form a sort of analogy with the [[LaughingMad Heaven Smiles]].
* ''VideoGame/KingdomHeartsII'': TheDragon Saïx. He uses the ominous [[TitleDrop Kingdom Hearts]] floating over [[TheVeryDefinitelyFinalDungeon The World That Never Was]] as the focus of his powers, turning him from TheStoic into TheBerserker. The aforementioned MacGuffin is, for all intents and purposes, the moon of The World That Never Was; the theme of the world is entitled Sacred Moon, the city is draped in eternal night with the only light source being Kingdom Hearts.

** In the Extra Mode of that game, a convenient full moon turns [[OurWerebeastsAreDifferent Keine Kamishirasawa]] into her hakutaku form, making her enough of a challenge to serve as an [[BonusBoss extra stage]] {{midboss}}.

* ''VideoGame/DensetsuNoStafy4'': The Mon Amour Stone—and, by proxy, Degil—grows in power the fuller the moon is. By the time Starfy and co. reach Degil, the moon is completely full and she is at her strongest.

** Yumigami is a [[MoonRabbit rabbit god]] who gives you the power of Crescent, allowing you to change day to night. [[NotCompletelyUseless It's rarely useful]]. Certain events can only happen at night, and one boss allows it to ''somehow'' be used as an attack.

** A good number of Pokémon evolve only at night, several of which having some kind of moon-related reason or theming beyond it. Eevee's Dark-type evolution Umbreon is a MoonRabbit-esque creature which the Pokédex said notes as evolving through the light of the moon, Rockruff becomes its more vicious and anthropomorphic Werewolf evolution as opposed to a more standard quadruped if it evolves at night[[note]](which in its debut generation occurs specifically only in ''Moon'' and ''Ultra Moon'')[[/note]], and Frosmoth's evolution from Snom at night may be a somewhat literal take on the name of the real-world ''moon moth''.

** [[VideoGame/PokemonXAndY Generation VI]] introduced the Fairy type, which was initially shown off with ''another'' MoonRabbit Eevee evolution with MagicalGirl influence named Sylveon, which was frequently shown using the move "Moonblast", a beam made by borrowing power from the moon and the strongest base power of all Fairy-Type moves. Additionally, the previously-mentioned "Moonlight" was changed to Fairy-type. These combined with the fact the aforementioned Clefairy and Jigglypuff families were given the type (with the former becoming pure Fairy) give the Fairy-type something of a lunar theme.

* ''Webcomic/{{Sinfest}}'': One of the many running gags is "Aah! Full moon! I'm turning into [whatever the character is most afraid of becoming]." As with most of ''Sinfest'''s running gags, the precise results can vary wildly -- for instance, a [[HornyDevil demoness]] turns into a housewife.

** In ''VideoGame/SwordOfMana'', Luna's magic is associated with transformation, able turn a caster into a moogle-like creature to evade monsters that don't rely on smell at the cost of being unable to attack. She can also [[ForcedTransformation turn enemies into Wimps]], small {{Blob Monster}}s that also can't attack. The exact form her offensive magic takes depends on the caster's weapon, but always gives off a golden light. If the caster wields an [[AnAxeToGrind axe]], the resulting SpreadShot arcs back at the edges in a crescent-like shape.

** 3.5th Edition has a monster called moon rats. They are perfectly ordinary rats most of the time, but when exposed to the full moon they become intelligent, organized, and ''evil''. They're also very, very patient -- don't think you're safe if they don't do anything of note on a full moon, because they're willing to make plans that take ''dozens'' of them to come full flower.

The words "lunacy," "lunatic," and "loony" are derived from "Luna" because of the folk belief in the Moon as a cause of periodic insanity. When planning stealthy invasions, some characters will wait for the night of a new Moon when the sky is the darkest.

See BadMoonRising for situations where the Moon itself is changed. See also MelancholyMoon for when used as a sad backdrop. ThePowerOfTheSun is often used as a {{Main/Foil}} to moon-based power. See also GodOfTheMoon.

* ''Manga/SpyXFamily'': Inverted. Anya loses her ability to read minds on the day of a new moon.

* In ''Franchise/TheElderScrolls'' series, this is actually averted for [[OurWerebeastsAreDifferent were-creatures]]. While many in-universe believe the disease has connections to Nirn's [[AlienSky twin moons]], this is not the case. Depending on the exact form of lycanthropy present in the infected, they may [[InvoluntaryTransformation transform nightly, monthly]], or [[SuperMode voluntarily at any time]].

* In ''Manga/{{Naruto}}'' the demon {{Tanuki}} sealed inside of Gaara is at its most powerful at full moon, and it's easier for Gaara to transform into Shukaku. (Thus, at least pre-time-skip, Gaara arguably counts as a [[OurWerewolvesAreDifferent were-tanuki]].)

* ''Franchise/SailorMoon'', whose powers are fueled by [[ThePowerOfLove love]], [[ThePowerOfFriendship friendship]], and the [[ExactlyWhatItSaysOnTheTin MOON!]]

* In ''VisualNovel/{{Tsukihime}}'', power of vampires is dependent on the phase of the moon. On full moon, even [[spoiler:regenerating from one's ankles up]] is possible. The reason for this is [[spoiler:all vampires are descended from what is essentially the AnthropomorphicPersonification of the moon: Crimson Moon Brunestud.]]

* ''Anime/YuGiOhArcV'': Serena uses a deck archetype called "Moonlight" ("Lunalight" in the [[DubNameChange dub]]), which has a theme of [[LittleBitBeastly female dancer werebeasts]]. This trope truly kicks in with TheReveal that [[spoiler:Serena's bracelet is actually the MacGuffin card "En Moon", which harnesses one of the four natural energies of the world (the moon obviously, with the other three being wind, birds and flowers), and is absolutely crucial in defeating [[BigBad Zarc]].]]

* The practice of [[https://en.wikipedia.org/wiki/Lunaception Lunaception]]. Under this practice, [[AppealToNature humans had a menstrual cycle that was ''perfectly'' synched to the moon's phases before the advent of artificial lighting, therefore artificial lighting is responsible (or among the things responsible) for menstrual irregularities and infertility]]. To combat this, couples who are trying to conceive using this method will sleep in ''complete'' darkness (lights off, set bedtime, light-blocking curtains)...except for right around the full moon, when a small nightlight (or opening the curtains) is permitted. (Couples trying to conceive should have sex during this time.) In time, this will supposedly reset the woman's menstrual cycle to synch with the moon's phases, so she will ovulate with the full moon and (unless she gets pregnant) menstruate with the new moon. The practice can allegedly also be used to ''prevent'' pregnancy, by abstaining from sex during the week of the full moon. However, it is considered pseudoscience; none of these claims have been proven or verified in a scientific setting.

* ''VideoGame/Dota2'' features two Moon-based heroes: Mirana the Princess of the Moon and Luna the Moon Rider, they also play the RedOniBlueOni on both aspects of the Moon, Mirana plays the more calmer and soothing elements of the Moon, and her skills are more utility-based and even a global invisibility to her whole team. Luna plays more on the more psychotic and ruthless aspects of the Moon, being a BloodKnight whose skill set are more based on how much damage she can dish out.

* In ''VideoGame/FinalFantasyVIII'', the Lunar Cry not only drops a torrent of monsters onto the earth from the moon, it also changes terrestrial animals into monsters.
* In ''VideoGame/FinalFantasyIVTheAfterYears'', the phase of the moon affects the strength of various commands. For instance, when the moon is full, Physical attacks are weakened, while BlackMagic is stronger and WhiteMagic is unchanged.
* ''VideoGame/FinalFantasyXIV: Stormblood'' has a notable endgame boss with a moon motif: [[spoiler:Tsukuyomi, a primal summoned by Yotsuyu crossing the DespairEventHorizon and going on a small-scale SuicidealCosmicTemperTantrum. Her body is half abalaster white and half obsidian black to represent the full and new moon, and one of her attacks divides the battlefield in half, black and white, with the player's lunar phase status increasing towards one color or the other the longer they stand on one side, potentially killing them if they don't switch sides.]]

* ''VideoGame/KingdomHeartsII'': TheDragon Saïx. He uses the ominous [[TitleDrop Kingdom Hearts]] floating over [[TheVeryDefinitelyFinalDungeon The World That Never Was]] as the focus of his powers, turning him from TheStoic into TheBerserker. The aforementioned MacGuffin is, for all intents and purposes, the moon of The World That Never Was; the theme of the world is entitled Sacred Moon, the city is draped in eternal night with the only light source being Kingdom Hearts..

* ''VideoGame/TheLegendOfZeldaTheWindWaker'': The moon, for some reason, has an influence on the whereabouts of the GhostShip. There is even a map illustrating the islands the ship visits according to the lunar phase.

* ''VideoGame/SkiesOfArcadia''. There are ''six'' moons (Red, Blue, Yellow, Green, Purple, and Silver, plus a [[CrypticBackgroundReference hinted-at]] lost Black one), all powering different types of magic, all dropping meteorites onto the land below which everyone then uses to power just about everything. And that's not even counting their plot-critical role...

[[folder:Visual Novels]]
* In ''VisualNovel/SpiritHunterNG'', it's rumoured that Tsukuyomi got its name -- which comes from the Japanese god of the moon -- from the fact that it can only be summoned when there's a moon out. When Akira and co. summon it, then run to the rooftop to escape it, the moon has turned [[BadMoonRising blood red]] thanks to its influence.
[[/folder]]

[[folder:Webcomics]]

[[quoteright:300:[[OurWerewolvesAreDifferent https://static.tvtropes.org/pmwiki/pub/images/werewolf_9693_8856.jpg]]]]
[[caption-width-right:300:[[DoubleEntendre Guess it's that time of the month again!]]\\
[-[[http://kerembeyit.deviantart.com/art/Suburbian-Nightmare-29299185 Image]] by [[http://kerembeyit.deviantart.com Kerembeyit]].]]-]

** ''VideoGame/SecretOfMana'' has [[ExactlyWhatItSaysOnTheTin Luna]], whose Moon magic has many uses, from casting MP-stealing spells, berzerker like buffs, to [[BalefulPolymorph shape-changing your foes]].

** In ''VideoGame/SwordOfMana'', Luna's magic is associated with transformation, able turn a caster into a moogle-like creature to evade monsters that don't rely on smell at the cost of being unable to attack. She can also turn enemies into [[BalefulPolymorph Wimps]], small {{Blob Monster}}s that also can't attack. The exact form her offensive magic takes depends on the caster's weapon, but always gives off a golden light. If the caster wields an [[AnAxeToGrind axe]], the resulting SpreadShot arcs back at the edges in a crescent-like shape.

* ''Series/KamenRiderDouble''[='=]s Luna Memory grants him the power of the Moon; officially it grants "[[MasterOfIllusion the power of illusions]]", which manifests as RubberMan powers for his GoodOldFisticuffs ('''Joker''') and MartialArtsStaff('''Metal'''), and {{Roboteching}} BeamSpam for his {{Handgun}} ('''Trigger''')

* ''Series/KamenRiderDouble''[='=]s Luna Memory grants him the power of the Moon; officially it grants "[[MasterOfIllusion the power of illusions]]", which manifests as RubberMan powers for his GoodOldFisticuffs ('''Joker''') and SimpleStaff ('''Metal'''), and {{Roboteching}} BeamSpam for his {{Handgun}} ('''Trigger''')

* ''Manga/{{Saki}}'': Koromo Amae. While normally sweet and innocent, her aggression and strength go up while underneath a full moon. [[BerserkButton Way up]].

* In ''VideoGame/FateGrandOrder'', UsefulNotes/{{Caligula}}'s insanity is stated to be due to the affections of the moon as afflicted by the goddess Diana. His Noble Phantasm "Flucticulus Diana" lets him spread his madness among others and involves summoning a moon to curse them.

[[folder: Films -- Live-Action]]