[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/rsz_marinasylum_9487.png]]

[[http://marinasylum.insanejournal.com Here.]] Welcome, criminal. You've been pulled out of your timeline for crimes you've committed. Nope, it doesn't matter if you were helping people or saving the world! Now you're here. Forever.

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!! This game provides examples of:

%%* AllCrimesAreEqual: According to the warden, shoplifting is as bad as genocide, and deserves a life sentence.
* AlternateSelf: Sometimes they meet here, such as [[Anime/CodeGeass Nunnally]] and her Nightmare of Nunnally counterpart.
%%* AppliedPhlebotinum: The dimensional stabilizer.
%%* ArsonMurderAndJaywalking: Some characters' crime lists read like this.
* BackFromTheDead: [[Manga/FullmetalAlchemist Hughes]] and [[Anime/CodeGeass Euphie]], among others, due to the warden bringing people from different canonpoints.
* BigBrotherInstinct: [[Anime/CodeGeass Lelouch]] is probably the worst about this, but most of the older siblings have it.
* BigBrotherWorship: [[Manga/AirGear Akito]], [[Anime/CodeGeass Rolo]], [[Anime/FullmetalAlchemist2003 Fletcher]], and a few others suffer from this. {{Deconstructed|Trope}} in most cases, with fun results for all!
* CantHaveSexEver: Sex is outlawed because Acumen doesn't want the criminals reproducing. And birth control is out of the question [[CircularReasoning because the criminals shouldn't be having sex]].
* ChildrenAreInnocent: Played with. Many of the inmates are minors, but children under thirteen are never arrested unless they've already committed heinous crimes.
* FishOutOfTemporalWater: Perhaps not directly due to taking place on another world, but a good portion of characters experience this considering the technologies available.
* JaywalkingWillRuinYourLife: Even just one crime is enough to get you sentenced to Marina for life.
%%* KilledOffForReal: If you die in Marina, you die in real life. And you get a tombstone in the graveyard!
* LifeOrLimbDecision : Played with by [[VisualNovel/UminekoWhenTheyCry Lambdadelta]], when realizing she is restrained by an ankle chain. She ropes [[VideoGame/{{Persona 3}} Minako]] into cutting off her foot for her, though because she's an immortal of some sort, she just sews it back on once the chain is removed.
* LuxuryPrisonSuite: Some of the inmates live in more fancier housing among the rest, those include [[Manga/BlackButler Ciel's]] replica of his mansion and [[Anime/CodeGeass Lelouch's]] house.
%%* MasterComputer: Acumen, more or less. Sentience used to be one, but then it started caring about the inmates.
%%* MightAsWellNotBeInPrisonAtAll: Many inmates' attitudes toward Marina's environs and lax rules.
%%* {{Nerf}}: Character superpowers are usually nerfed.
* NiceJobBreakingItHero: [[Anime/SerialExperimentsLain Lain]] when she tried to fix Sentience's programming to prevent AllCrimesAreEqual. Instead, Sentience shut down and so did the life support for three days.
* PenalColony: More or less.
* RoaringRampageOfRevenge: [[Franchise/AceAttorney Dahlia Hawthorne]] did this ''after'' [[Anime/FullmetalAlchemist2993 Russel]] killed her. [[NiceJobBreakingItHero You done good, Pearl.]]
%%* RobotMaid: Some of the bots do menial labour like this.
* SiblingYinYang: The [[Anime/FullmetalAlchemist2003 Elric and Tringham brothers]] and, to an extent, the [[Anime/CodeGeass Britannian royal family]].
* SlidingScaleOfLawEnforcement: Justified by the Defense Force being unable to do anything unless muns actually communicate.
* ThereIsNoHigherCourt: Subverted. Sentience's creators, and later Sentience itself, were all tried and sentenced for kidnapping the inmates.
* ThirtySecondBlackout: Averted. The blackout lasted two days and some change, and then still took some time to get everything up and running again.
%%* TranslatorMicrobes: The communicators act as these.
%%* TranslatorCollar: The communicators also work as these, for the animal characters anyway.
%%* UnderwaterCity: Marina is one.
%%* ViewerGenderConfusion: No one can decide on the correct pronoun for Sentience or Acumen.
* WorkingOnTheChainGang: New inmates whose crimes involve some form of murder are often chained to iron balls for the first few days of their imprisonment and shepherded around doing menial labor. A minor example, since this menial labor involves gardening and doing laundry.

!! The players in this game provide examples of...
* EyeScream: Poor Keri.
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