[[http://www.fanfiction.net/s/9182324/1/Lost-Souls Lost Souls]] is a Music/{{Vocaloid}} fanfic by Tropers/{{theunhappytwins}} about....well, it at first looked like a case of GottaCatchEmAll, but that seems to have changed with recent chapters. It is currently in progress.
Not to be confused with Literature/LostSouls, which is about vampires.
Now has a [[Characters/LostSouls characters page.]]
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!!Examples

* AbusiveParents: [[spoiler: Prima.]]
* ActionGirl: All of the girls, pretty much, except [[DirtyCoward Mizki.]]
* AffablyEvil: Ruko is definitely this.
* AllOfTheOtherReindeer: Ia and Teto suffered this in their pasts.
* BadAss: Just about everyone.
** BadassNormal: Mikuo, though he mentions having his strength enhanced by 002. Whoever or whatever that is.
** LittleMissBadass: Rin is fourteen. ''She will kick your ass.''
* BigBrotherInstinct: After the AU version of Meiko [[spoiler: dies]], Len took it upon himself to take care of Rin.
* BodySwap: Mizki's power.
* BreakThemByTalking: Mikuo to Gakupo. [[spoiler: And Rin, as of the latest chapter.]]
* BrokenBird: Rin and Meiko.
* BrotherSisterIncest: One-sided, between [[spoiler: Mikuo and Miku.]]
* ClusterFBomb: A whole lot of people, but Rin takes the cake.
-> Rin(thinking): Just fucking beat the shit out of Len. Focusing on that is just going to make it harder for me to ''fucking murder him''.
* ColdBloodedTorture: What Mikuo does to people, and what Rin does to Len.
* ContemplateOurNavels: Occasionally lapses into this.
* CreepyCrossdresser: Mikuo was one in his {{Backstory}}.
* DarkAndTroubledPast: ''Everyone.''
* DeerInTheHeadlights: Mizki when [[spoiler: Rin cuts out [[BodySwap Len's]] [[EyeScream eye.]]]]
* {{Determinator}}: Gakupo, ''so much.''
* DirtyCoward: Mizki uses her BodySwap to run away and put someone else in whatever bad situation she's in.
* DysfunctionJunction: And ''how''!
* EyeScream: [[spoiler: Len. Or Mizki. [[BodySwap It's hard to tell.]]]]
* FightsLikeANormal: Meiko doesn't like to use her fire powers. [[CrowningMomentOfAwesome Much.]]
* FreudianExcuse: Despite him being [[RapeAsDrama seriously]] [[BreakThemByTalking fucked-]][[TortureTechnician up]], Mikuo's life [[ParentalNeglect really]], [[ForcedToWatch really]] [[JerkassWoobie sucked.]]
* HeroicBSOD: [[spoiler: Gakupo]] is currently in the midst of one, as is Rin.
* HeWhoFightsMonsters: [[spoiler: Rin.]]
* ItsAllMyFault: What Teto thinks.
** [[spoiler: Len]], too.
* {{Jerkass}}: Rin, Meiko, and Len.
** JerkassWithAHeartOfGold
* KilledOffForReal: [[spoiler: Len.]]
* KnifeNut: Rin.
* LazyBum: Ruko.
* {{Leitmotif}}: The author gives them in chapter playlists. Almost every character has one.
* LoadsAndLoadsOfCharacters: It's a fanfic of Music/{{Vocaloid}}. This is pretty much a given.
* ParentalAbandonment: [[spoiler: Rin and Len were abandoned by their parents who had had too many children.]]
* ParentalNeglect: [[spoiler: Prima just didn't care about Mikuo.]]
* PersonalityPowers: [[LazyBum Ruko]] can knock people out with her mind.
* PlayingWithFire: Meiko.
* PleaseWakeUp:
-> [[spoiler: Rin:]] Stop mocking me and breathe. BREATHE, DAMMIT.
* PunctuatedForEmphasis: A whole lot of this.
->[[spoiler: Len]]: Do. Not. Talk. About. My. Sister. Like. That.
* ShipTease: Two words: [[ChildhoodFriendRomance Teto.]] [[TheAtoner Gakupo.]] Need we say more?
* ShoutOut: To ''Anime/HigurashiNoNakuKoroNi'', Music/{{Mothy}}, WebOriginal/NESGodzillaCreepypasta, and ''Manga/PandoraHearts''.(the latter two only in author's notes)
** Speaking of author's notes, tropes are often name-checked.
* StepfordSmiler: Teto.
* RapeAsBackstory: Rin.
* RevengeMyopia: Poor, poor [[spoiler: [[TheWoobie Teto.]]]]
* MindOverManners: Ia's power.
* MyGodWhatHaveIDone: [[spoiler: Rin, after she kills Len.]]
* TheAtoner: Gakupo is this currently.
* TheOphelia: Miku.
* TheSociopath: Possibly [[spoiler: Ia]]...it's rather ambiguous. Mikuo, too, has a high chance of being this.
* TheStoic: Len seems to be this.
* TroubledBackstoryFlashback: Chapter 20 for Len and Rin.
** Chapter 23 also serves as this for Mikuo.
* UsedToBeASweetKid: Oh, [[BrokenBird Rin]]...
* WoobieDestroyerOfWorlds: Miku.
** Mikuo, too, to some degree.
* WorldOfBadass: [[LampshadedTrope Lampshaded]] in an author's note.
* WouldHitAGirl: And attempt to [[{{Revenge}} kill her]], too.
* YouAllShareMyStory: Even in ''different universes'', the Vocaloids all are sent to find each other.