''Fangs & Fins'' is a H2OJustAddWater FanFiction. It centers around the life of mermaid Rose Collins, a quiet, [[TheCynic cynical]] girl who can not get over the murder of her mother six years prior, after she befriends a group of vampires and the complications that then follow.

It's more of an AU fic rather than a crossover, though the series was heavily inspired by LJ Smith's works. Most of the canon characters from H2OJustAddWater appear in the series, and most of them have maintained the basis of their personality, though their names and backgrounds have significantly changed. The original piece concluded in April of 2011.

A sequel was released in June of 2011 and explores the mermaid mythology and tyranny of the vampire world's government that was introduced in the original fic more deeply. It may be read [[http://www.fanfiction.net/s/5120260/1/Fangs_Fins here]]
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!! Fangs and Fins provides examples of:
* AbandonShip: [[spoiler: Both Lily/Lewis and James/Rose were treated to this later on in season 1]]
* AbusiveParents: All of the Council families.
* ActionGirl: Lily, Arianna and Minerva do just as well (if not better) than the boys when it comes to fighting.
* ActorAllusion: The kids like the series ''LegendOfTheSeeker'', which Craig Horner, who portrays Ash, was in.
** Rose seems to like the band Muse, as Cariba Heine does in RealLife.
* ADayInTheLimeLight: 2.02 - "Arianna".
** 2.07 - "Sofia"
* {{Adorkable}}: James, at least when trying to talk to girls..
* AlliterativeName: Minerva Montgomery, along with her three sisters and parents.
* AllGirlsWantBadBoys: Probably the reason for Lily's initial attraction to Ash, and perhaps Rose's to Ben.
* AllLoveIsUnrequited
* AloofBigBrother: Ben and Constance had a tendency to see James as this.
* AlternateUniverseFic
* AnAesop: There are a couple, the biggest one being to open yourself up to new feelings.
* AmbiguouslyBrown: Sofia, as suggested by her actress and her ambiguous ethnicity.
* AmbiguouslyEvil: [[spoiler: Violet]], until the latter half of season 2 took the 'ambiguous' out of it. Same goes for [[spoiler: Petra, who seemed to be kind yet misguided throughout season 1 and the first half of season 2, before she is slowly revealed to be pure evil after she blackmails Lily.]]
** [[spoiler: Byron, who was a slightly less subtle example, initially appeared to be a friend of Lily's, until it's revealed he's Elliot's minion]]
* AmbiguouslyJewish: Several of the Nereids have Jewish surnames, but Léa Abel is probably the best example.
* AmbitionIsEvil: Played straight in one case [[spoiler: (Violet)]] and ultimately averted in another [[spoiler: (Ariadne).]]
* AntiHero: Most of the characters in one way or another, but most notably Ben who [[spoiler: committed a series of completely unjustifiable murders.]]
* ArrangedMarriage: Arianna discovers that her mother and James's father are planning one between James and herself. They are ''first cousins''.
** This seems to be very common between the families who have family members on the Council and becomes a ''major'' plot point in season 2 when [[spoiler: Sofia and Katharina are pitting against each other for Ben's hand.]]
* AscendedExtra: Arianna made a few appearances in the last few chapters leading up to the finale but was promoted to the main cast during the sequel/season two.
** Ben was more of a background character until halfway though the story when he was promoted to the main cast. Now he gets more page time than James.
* AssholeVictim: [[spoiler:Jewel]] wasn't exactly the nicest person around.
* TheAtoner: Arguably Ben, but one can argue that he was just seriously misguided rather than completely evil.
* {{Badass}}
** BadassBoast: James has a (subtle) on in 2.08. [[spoiler: "What is sand made out of?]]
** BadassBookworm: James, Minerva, Lily are the most scholarly and well-read of the bunch and arguably the three most competent fighters.
** BadassGay: [[spoiler: Arianna]]
* BetaCouple: In season 1, Lily/Lewis, Ash/Lily and Constance/Lewis, though Lily/Lewis is the most consistent example.
* BiTheWay: [[spoiler:Lily is probably best considered pansexual, actually. ''Strongly'' implied with Elisabeth, Isabel and Violet as well.]]
* BewareTheNiceOnes: [[spoiler: Constance.]]
** [[spoiler: Léa]]
* BigEater: The wolf pack and Byron.
* BigScrewedUpFamily: All of them, basically.
* BelligerentSexualTension: Rose and James initially had this dynamic, however it faded quickly.
** Ben and Rose have a peculiar relationship.
* BetterAsFriends: Lily decides this about her and Lewis.
** This seems to be the offical verdict on [[spoiler: James/Rose]]
** As well as [[spoiler: [[IncompatibleOrientation Arianna/Ben]] ]]
* BettyAndVeronica: Rose must pick between James (Betty) and Ben (Veronica).
** In season 1, Lewis (Betty) and Ash (Veronica) for Lily.
* BirdsOfAFeather: Ben and Rose. They're both passionate, impulsive and headstrong.
** James and Minerva.
* BlondeBrunetteRedhead: Kind of. Rose is strawberry blonde and would (probably) qualify as a FieryRedhead, Minerva is a BrainyBrunette, spoiler: but Constance was not, and Arianna is very much ''not'' a DumbBlonde, same with both Lily and Laurel.
* BloodLust: Pretty much every vampire in the series at one point or another, but particularly [[spoiler: Arianna in season 2]]
* BrandX: [[http://fangbook.webs.com/ Fangbook]]
* BrokenBird: Constance and Rose, big time. Lily, Arianna and Minerva too. Hell, pretty much ''everyone''.
* BrokenPedestal: [[spoiler: Violet for Rose.]]
* ButtMonkey: James, who is referred to as a Fun Sponge and is made fun of by pretty much every character at one point or another.
* ByronicHero: Ben.
* CharacterDevelopment: Ben, Rose and Lily.
** A lesser example is Lewis, who [[spoiler: finally let Lily go and decided to move on.]]
* CupidHatesOddCouples: So much.
* DanceOfRomance: All over the place in 2.08, most prominently [[spoiler: Arianna/Lily]].
* DarkSecret: Several.
* DeadpanSnarker: Several candidates.
* DefrostingIceQueen: [[spoiler: Implied with Arianna]]
** Rose.
** [[spoiler: And later on, Minerva]]
* {{Dhampir}}: Both Arianna and Ben.
** Also Arianna's younger sisters, Katharina and Natalia.
** [[spoiler: Elliot]]
* DisproportionateRetribution: Rose has a tendency to overreact in regards to Lily.
** Ben, sometimes, notably when he blows up at Arianna and James in 2.02.
* TheDogBitesBack: [[spoiler: Constance]]
* DownerEnding: Season 1.
* DrowningMySorrows: Subverted. James often resorts to this, but he drinks blood mixed with alcohol instead.
** Arianna and Ben, too.
* EarlyBirdCameo: Sofia and Ivy.
* EeriePaleSkinnedBrunette: James, Ben, Minerva, Marie...
* TheEeyore: Rose, at first.
* EmbarrassingMiddleName: James's is Ayden, which Arianna describes as being "kind of girly".
* EmotionlessGirl: Rose early on.
* ExtracurricularEnthusiast: Minerva and Lily.
* FakeoutMakeout: [[spoiler:Ben/Rose in 2.08]]
* FieryRedhead: Well reddish-blonde. Rose, and Violet before her.
* FiveManBand: Well, more like Ten Man Band.
** ''Season 1'':
*** TheHero - Rose
*** TheLancer - Ben
*** TheSmartGuy - Lewis and Lily
*** TheBigGuy - James
*** TheChick - Constance
*** TheSixthRanger - Arianna
** ''Season 2'':
*** TheHero - Rose
*** TheLancer - Ben
*** TheSmartGuy - James and Lily
*** TheBigGuy - Lewis, in a rather odd inversion. Also Will.
*** TheChick - Laurel
*** TheSixthRanger - Minerva
*** TheHeart - Arianna
*** TokenEvilTeammate - Sofia
** The Wolf pack are also a perfect example of this:
*** TheHero: Will
*** TheLancer: Christian
*** TheSmartGuy: Noel
*** TheBigGuy: Micah
*** TheChick: Lewis
* FloralThemeNaming: Rose, Lily and their mother Violet.
** If you extend it to plants - Ash and his sister, Ivy.
* FoolishSiblingResponsibleSibling: Rose and Ben are Foolish, Lily and James are Responsible.
* FourTemperamentEnsemble: Constance - '''[[color:maroon:sanguine]]''', Rose - '''[[color:orange:choleric]]''', Lily - '''[[color:black:melancholic]]''', and Arianna - '''[[color:green:phlegmatic]]'''.
** Laurel - '''[[color:maroon:sanguine]]''' and Minerva - '''[[color:black:melancholic]]'''.
** Will - '''[[color:maroon:sanguine]]''', Ben - '''[[color:orange:choleric]]''', James - '''[[color:black:melancholic]]''', and Lewis - '''[[color:green:phlegmatic]]'''.
* FreudianTrio: Rose (Id), Lewis (Ego), and Lily (Superego). Also Ben (Id), Lewis (Ego), and James (Superego).
* FriendVersusLover: Subverted. This is what leads Lily to break up with Lewis because she thought their relationship would be weird for Rose or too hard for her to handle.
* GenerationXerox: Played with. Aside from the obvious, such as Rose resembling Violet and Ben/James resembling Isaac, Rose and the brothers all possess different personalities than their parents did and Rose is no where near as [[spoiler: crazy as Violet was, though if Isaac resembles either brother personality wise he is closer to Ben than James, meaning that Rose/Ben kind of parallels Violet/Isaac, specifically that Violet/Isaac was mostly physical, which Rose almost seems to be trying to convince herself that her connection with Ben is just physical (i.e. what occurred in 2.04...)]]
** [[spoiler: Another blatant parallel would be Ariadne/Lea vs. Arianna/Lily. They even do the forehead-touching-thing and link arms constantly. Also - '''A'''riadne/'''L'''ea, '''A'''rianna/'''L'''ily]]
* GenkiGirl: Constance.
* GirlPosse: Minerva had one at Billiard.
* GirlsLoveStuffedAnimals: Constance and Rose.
* TheGloriousWarOfSisterlyRivalry: Rose and Lily.
* TheHeart: Arianna, Lily and Lewis.
* HeterosexualLifePartners: Ben and Lewis.
* HiddenDepths: Just about everyone.
* HowTheMightyHaveFallen
* HufflepuffHouse: The Campbells.
* IceQueen: Rose, before James and Ben [[DefrostingIceQueen defrosted]] the hell out of her.
** Minerva
* ImprobablyFemaleCast: The Nereids.
* InterspeciesRomance: Almost everyone. The only notable exception is James/Minerva (both vampires).
** [[OurMermaidsAreDifferent Rose]] dated James and has feelings for Ben, both vampires.
** [[OurMermaidsAreDifferent Lily]] dated Lewis [[spoiler: when he was human]], Ash (human) and [[spoiler: has feelings for Arianna (vampire)]]
** [[OurWerewolvesAreDifferent Lewis]] dated Constance (vampire), Lily (mermaids) and [[spoiler: Laurel (mermaid).]]
* IntoxicationEnsues: Arianna and James in 2.02.
* IvyLeagueForEveryone: Minerva wants more than anything for this trope to apply to her.
* {{Jerkass}}: Jewel definitely crosses into this trope.
** Also [[spoiler: Ash]]
** And [[spoiler: Elliot]]
** Isaac Wood too.
* JerkassFacade: Ben.
* JustFriends: Lily and Lewis.
** Arianna insists that she and Ben are this too. [[spoiler: Rose does the same.]]
* KarmaHoudini: Ben.
* KickTheDog: [[spoiler: Jewel, towards Constance. Like for 95% of her pagetime]]
** Ben to Arianna in season 2.
* KillTheCutie: Abigail and[[spoiler: Constance]]
* KissingCousins: James and Arianna are forced into an arranged marriage.
* KissingUnderTheInfluence: [[spoiler: Lily and Arianna.]]
* LadykillerInLove: Ben's a minor example.
* LieBackAndThinkOfEngland: Minerva's wedding "blessing" to Marie.
* LikeBrotherAndSister: Rose and Lewis
* [[spoiler: LipstickLesbian: Arianna. Implied with Madeleine Montgomery.]]
* [[spoiler: LastGirlWins: James/Minerva, Lewis/Laurel. If you want to get technical about it, Lily's relationship with Arianna actually fits FirstGirlWins better harharhar.]]
* LoveDodecahedron: A milder version, mostly.
** '''Season 1''': Jewel wants James who is dating Rose who Ben ''thinks'' he might have feelings for. Lewis is dating Constance but still isn't over Lily who is interested in both Ash and Byron.
** '''Season 2''': [[spoiler: James is frustrated that Ben kissed Rose which leads him to question his relationship with both of them, and is a big factor as to why they break up. Ben then feels guilty about possibly pursuing Rose, however James moves on quickly and starts developing feelings for Minerva. Lily thinks she may be interested in Arianna, but she thinks that Arianna may have a thing with Ben, while Lewis pursues Laurel. And James and Arianna get forced into an ArrangedMarriage...]]
* LoveMartyr: Lewis for Lily, a lot of the time. The guy's devoted, sure, but he does a better job at parenting Rose than Lily does and enjoys the company of Ben/James/Constance. He gets absolutely nothing out of his relationship with Lily, while he got new friends and ''consistency'' out of his friendship with Rose - yet he will always take Lily's side if an argument arises.
** To be fair though, Rose is insensitive as hell and Lily's side in arguments is generally more logical. Rose wouldn't pick Lily over James/Ben, but Lily sure would pick Rose over Lewis, which he sadly realizes.
** Lewis also has an easier time relating to Lily, Rose is very selfish and Lily is very selfless, Lewis can align himself with her because they're personalities are similar. Lily also doesn't seem to take Lewis for granted as Rose often does.
* LukeIAmYourFather: More like [[spoiler: "Lily and Rose, I am your brother's father" from Mr. Wood.]]
* TheMasochismTango: James/Rose in season 2.
* ManicPixieDreamGirl: Constance, kind of.
* NamesTheSame: Lily Collins.
* NeatFreak: James, according to Arianna.
* NiceGuy: Lewis, Will and James.
* NotBloodSiblings: Constance with James and Ben, as she is adopted.
** [[spoiler: James, Ben, Rose and Lily all share a sibling, but they are not technically related themselves.]]
* OddFriendship: Ben with mostly everyone, ''especially'' Rose. To a lesser extent, Lewis and Ben.
* OddNameOut: Lily, Rose and Elliot Collins. The former two are named after flowers, will Elliot is not.
** James and Ben are both named after biblical figures, Benjamin was the last of Jacob's twelve sons and James after the Epistle of James. Their adopted sister Constance is the OddNameOut.
* OneGenderSchool: Arianna and Minerva's old school, Billard.
* OnlySaneMan: Most frequently Lewis. Out of the wolf pack, Noel.
* TheOphelia: Constance.
* OurMermaidsAreDifferent: Averted. The difference between mermaids and sirens is made very clear.
* OurVampiresAreDifferent: For one thing, there are three species of them. The ones who are born - who can digest small portions of human food, drink blood, and have ElementalPowers. The ones who are born but are half-human/half-whatever can do the same. Then the ones who are made - they cannot digest human food, can't have children and don't have any powers.
* ParentalFavoritism: Subverted. Mr. Wood favors James because he is the only child who is 100% vampire, but the word "favors" should be used loosley...
** Minerva's parents have a tendency to favor her older, successful siblings.
* PensieveFlashback: [[spoiler:A big, plot-heavy one with the Nereids.]]
* PlatonicLifePartners: James and Arianna manage to keep things platonic while sleeping in the same bed in 2.02. Despite kissing in 2.03, they both admit to feeling nothing and have spent the rest of season 2 as close friends.
** Ben and Arianna. Kind of. [[spoiler: Ben definitely had feelings for Arianna prior to finding out she was gay, and his reaction to Arianna and James's ArrangedMarriage in 2.03 suggest a repressed attraction.]]
** Rose and Lewis
** [[spoiler: The direction Lily/Lewis has been heading in as of season 2.]]
* PosthumousCharacter: Several. Lily and Rose's mother Violet, Ben's mother Anna, James' mother Ashley, and Elliot. [[spoiler:However, it is revealed that Violet and Elliot survived.]]
* PowerTrio: Lily, Lewis and Rose. James, Ben, and Arianna resolved themselves from a [[FourTemperamentEnsemble Four Temperament]] into this after season 1.
* PreppyName: All over the place, most notably with the Montgomery sisters - Marie, Madeleine, Mathilda and Minerva.
* PromotionToParent: Lily, James also shows shades of this.
* PutOnABus: Jewel, Mr. Collins, Byron, Charlotte
** Jewel came back very briefly in the last few chapters [[spoiler: only to be killed off]]
** Mr. Collins also never made a physical appearance, therefore he was never actually PutOnABus. He did appear in the season 1 finale, however, and makes frequent appearances in season 2.
** Ash tends to drift in and out of the story.
** TheBusCameBack in 2.08 for Charlotte.
* ReallyGetsAround: Implied with Ben and Jewel.
* RedOniBlueOni: Rose and Ben are red, Lily and James are blue.
* ReligiousAndMythologicalThemeNaming: James, Benjamin, and Isaac Wood.
** Lampshaded with Minerva.
** Léa is another from of Leah, who was Jacob’s first wife.
** Also Ariadne. Several of the Nereids were named after actual Nereids as well.
* RomanticTwoGirlFriendship: [[spoiler: Lily and Arianna]] stray into this.
** [[spoiler: Also Elisabeth and Violet.]]
* RunningGag: Hugsy.
** The kids drinking Coke and marathoning tv. Also, LegendOfTheSeeker
** James being boring or too serious.
*** Twilight.
* SacrificialLamb: Rose and Lily's mother and brother. [[spoiler: But they actually both survived]]
* SacrificialLion: Arguably [[spoiler:Constance.]]
* [[spoiler: SecondLove: James/Minerva, Lewis/Laurel, Lily/Arianna, Ben/Rose. Even Constance/Lewis]]
* SheIsNotMyGirlfriend: Arianna and Lily in 2.06. Ben in 2.07.
* ShipTease: Loads between Rose and Ben, but a particularly mean one happens in the first season finale when [[spoiler: the two kiss passionately, but are interrupted by Mr. Collins. Rose then goes back to James, inisting that the kiss was a mistake]]
** Oh boy...Lewis/Lily, which is, by far, the most prominent example.
** Lily/Ash, Lily/Byron...
** Arianna/James, who even kissed in 2.03
** Arianna/Ben
* SiblingRivalry: James and Ben, Lily and Rose. The former is more of a typical rivalry whereas the latter consists more of constant bickering, however.
** Minerva with all of her sisters, ''especially'' Maire...
* Sibling Triangle: Both Wood brothers are interested in Rose.
* SiblingYinYang: Lily is logical and overthinks things while Rose is impulsive and sometimes underthinks things. Ben is passionate, mischievous and headstrong while James is serious, thoughtful and cerebral.
* SlapSlapKiss: Rose and Ben. They spend the first portion of the original story hating each other, the second half full of UST, and by the sequel [[spoiler: things are still weird between them - Rose says Ben is avoiding her, they kiss in Rose's room, etc]].
* SuperpowerLottery: For the vampires and werewolves.
** SuperSpeed: They can move and run much faster than that of a normal human.
** SuperReflexes: They can react much faster and quicker to situations than that of a normal human.
** SuperStrength: They are able to carry or lift heavier objects with much ease and little effort.
** HealingFactor: Vampires only. They can get stabbed, shot or wounded and she will heal immediately.
** SuperSenses: All of their senses, such as sight, smell, taste, touch and hearing have become clearer, stronger and heightened. They are able to see, smell and hear things from a greater distance than that of a normal human.
* TriangRelations: Ben/Rose/James was a type 4 in season 1, but eventually morphs into a pretty straight type 9 by season 2.
** Lewis/Lily/Rose is a (mostly platonic) type 9, with Lily's loyalty to Rose preventing her from entering a romantic relationship with Lewis.
* TakeThat: Twilight. Just Twilight.
* TallDarkAndHandsome: James.
* TeamMom: Lily.
* TookALevelInBadass: Lewis in season 2.
* TookALevelInJerkAss: Either Rose or perhaps James (specifically in the last five chapters or so, due to stress) would probably qualify.
** Don't forget [[spoiler: Ash, Byron, Jewel and Elliot.]]
*** Ben in season 2. He reduced Arianna to tears when she was trying to mediate a fight between him and James, and spends the majority of 2.03 being a jerkass, ''again'', to James and Arianna.
* TroubledButCute: Ben.
* TrueCompanions: Yes, it's a LoveDodecahedron, and yes, [[DysfunctionJunction they ''all'' have issues]], but the group really do care deeply about each other. Even Minerva.
* TheUnfavourite: Notably Ben and Constance, but Minerva as well.
* WrongGirlFirst: [[spoiler: Played pretty straight with Lewis's relationship with Lily.]]
** [[spoiler: Once, again played straight with James's relationship with Rose.]]
* TwoGirlsAndAGuy: Rose, Lily, and Lewis. But, surprisingly, while it lasted, [[spoiler: the romantic triangle was more friendship vs. love rather than the two girls fighting over the guy.]]
* TwoGuysAndAGirl: James, Ben, and Arianna.
* WillTheyOrWontThey: Ben and Rose. Lily and [[spoiler: Arianna.]]
* YouHaveOutlivedYourUsefulness: Blake Lockwood threatens [[spoiler: Sofia]] with this.
* YourCheatingHeart: James and Jewel, though Jewel more or less threw herself at James, and it clearly didn't mean anything. Rose's kiss with Ben, however...