H2O: Just Add Water Crossovers
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Just Add Fangs by mazikeenhales reviews
Cleo Sertori, Emma Gilbert and Rikki Chadwick are mermaids. Their lives were good until Emma Gilbert came home, panicking, saying she had to leave. Cleo and Rikki searched for Emma but did not find her. That started the adventure of Cleo Sertori becoming Hayley Marshall, ending up in New Orleans pregnant with the Original Hybrid's baby when all she wanted to do was find her sister.
Crossover - H2O: Just Add Water & Originals - Rated: T - English - Supernatural - Chapters: 5 - Words: 8,361 - Reviews: 7 - Favs: 53 - Follows: 60 - Updated: 11/21/2020 - Published: 9/25/2020 - [Cleo S., Klaus M.] Rebekah M., Hayley Marshall
Power Rangers Dino Thunder: Might of a Dragon by Chris Rudy reviews
Six students become chosen to be the new team of Power Rangers. What happens when half of these new Rangers are discovered to be hiding something from their teammates? Find out in this story.
Crossover - Power Rangers & H2O: Just Add Water - Rated: T - English - Chapters: 5 - Words: 22,310 - Reviews: 6 - Favs: 25 - Follows: 26 - Updated: 10/29/2020 - Published: 2/16/2017
Opposite Nature by 100NaturalBacon reviews
Azula, after fleeing into the forest of Forgetful Valley, is tracked by Fire Nation soldiers and trapped on a mysterious island. After one fateful night, Azula now has to cope with her newfound abilities while trying to keep her secret hidden from the world. (Azula Mermaid AU) [WARNING: Unfinished and permanently on hiatus]
Crossover - Avatar: Last Airbender & H2O: Just Add Water - Rated: T - English - Adventure/Supernatural - Chapters: 9 - Words: 59,595 - Reviews: 43 - Favs: 28 - Follows: 37 - Updated: 9/26/2020 - Published: 7/19/2019 - Zuko, Azula
H20: Just add cats by TheSkyclanCat reviews
The 4 leaders were somehow transported to the H20 universe as humans. Now they're back with their clans, and everything would be fine if they didn't turn into half-fish half-cat hybrids whenever they touch water. Multiple ending fic and cross posted on A03
Crossover - Warriors & H2O: Just Add Water - Rated: K - English - Family/Friendship - Chapters: 36 - Words: 60,820 - Reviews: 32 - Favs: 8 - Follows: 5 - Updated: 9/6/2020 - Published: 6/12/2020 - Firestar, Blackstar, Mistyfoot, Onestar
Heroes of Olympus H2O: Just Add Water Crossover by softballcrazyoh reviews
After the Giant War ended, Percy Jackson, Annabeth Chase, Jason Grace, and Piper McLean decide they need a vacation. They needed a break from all the monsters, so they decide to go to Australia, the only place the gods have never been in power. During their time there, they meet some interesting girls that might just introduce a whole new problem to their hero to-do list.
Crossover - Percy Jackson and the Olympians & H2O: Just Add Water - Rated: K+ - English - Fantasy/Adventure - Chapters: 40 - Words: 28,673 - Reviews: 19 - Favs: 66 - Follows: 65 - Updated: 8/28/2020 - Published: 5/14/2020 - Percy J., Rikki C., Cleo S., Emma G. - Complete
Under the Sea by rosesnblueberries reviews
Cleo and Lewis have been travelling all over the world in search of other magical beings like herself, but to no avail. But, once they visit New Orleans where there is a reputation of the supernatural, will they run into the thousand year-old vampire family? What will be said about the uncanny similarities between Hayley and Cleo?
Crossover - H2O: Just Add Water & Originals - Rated: K+ - English - Romance/Supernatural - Chapters: 5 - Words: 2,981 - Reviews: 33 - Favs: 64 - Follows: 75 - Updated: 7/22/2020 - Published: 2/7/2016
H2O Sakura by A Star Rewriter reviews
Cleo, Rikki and Bella are fine after graduation, but when a new girl comes to town, she reveals she knows their secret and has met their friend Emma. The truth is that Emma is in danger and they must travel into the darkest part of the sea only mermaids know, the Abyss. Can they save Emma before it's too late?
Crossover - Card Captor Sakura & H2O: Just Add Water - Rated: K - English - Friendship - Chapters: 2 - Words: 1,694 - Reviews: 2 - Favs: 1 - Follows: 1 - Updated: 6/29/2020 - Published: 6/27/2020 - Rikki C., Cleo S., Bella H.
Werewolves, mermaids Witches whats next fairies? by LilithAnnRose reviews
One shots to chapters of Sterek(stiles and derek), mermaids/merman, yeti/abominable snowman, werewolves, banshees and more. Some are one shots others are unfinished until a later possible date. Unbeta read. So there will be some errors. A few ocs get thrown in. Lots to uncover in these one shots sortas. Rated teen for now.
Crossover - H2O: Just Add Water & Teen Wolf - Rated: T - English - Supernatural/Humor - Chapters: 4 - Words: 11,518 - Reviews: 1 - Favs: 5 - Follows: 5 - Updated: 5/29/2020 - Published: 3/8/2020
The power of Mako by Sirton reviews
This happens at the end of Mako mermaids series. When Zac, Mimmi and Nerissa are gathered, revelations take place about Zac, and Nerissa tries to make Evie recover her powers.But quickly, a great and organized threat appears. A strange new character appears too. With his help, will the characters know how to use the powers of Mako to face the threat ?
Crossover - H2O: Just Add Water & Mako Mermaids - Rated: K+ - English - Friendship/Adventure - Chapters: 1 - Words: 4,560 - Reviews: 3 - Favs: 7 - Follows: 6 - Published: 3/28/2020
Secrets of the sea by flora swan reviews
Bella goes on holiday but her life changes when she was transformed into a mermaid. She gets close with Rikki, Bella H and Cleo so she was aloud to stay there cause she wanted to stay there because she didn't want to go back to Forks cause of Jacob said to her. Bella falls in love when she was there.
Crossover - Twilight & H2O: Just Add Water - Rated: K - English - Friendship/Supernatural - Chapters: 3 - Words: 2,949 - Reviews: 39 - Favs: 100 - Follows: 124 - Updated: 8/25/2019 - Published: 3/25/2016 - Bella, Rikki C., Cleo S., Bella H.
H2Winx by roseannacharlotte reviews
When Layla Andros starts at Alfea she's hiding a secret. She's a fairy. What happens when she and her six dorm mates end up inside the volcano during a school field trip to Mako Island? They gain another secret to hide. Now when they get wet, they transform into mermaids.
Crossover - Winx Club & H2O: Just Add Water - Rated: K - English - Chapters: 2 - Words: 2,840 - Reviews: 1 - Favs: 3 - Follows: 7 - Updated: 7/20/2019 - Published: 6/4/2019
Crossing Realms by Synth Dahl reviews
Charlotte Watsford avoided losing her tail and powers the night of the fifty year full moon. After swimming away, she finds herself in the small town of Storybrooke, Maine *Currently on hiatus*
Crossover - H2O: Just Add Water & Once Upon a Time - Rated: K+ - English - Drama/Fantasy - Chapters: 13 - Words: 9,217 - Reviews: 8 - Favs: 21 - Follows: 23 - Updated: 6/28/2019 - Published: 2/21/2017
Fishy Imprint by BlueMaid19 reviews
The pack seems to get more than what they bargained for when rescuing a mysterious girl on the beach. Little do they know that their lives will remain forever changed once this new, fishy imprint joins the tribe. I ONLY OWN ANGEL. NOT ANY OF THE OTHER CHARACTERS!
Crossover - Twilight & H2O: Just Add Water - Rated: T - English - Romance/Drama - Chapters: 10 - Words: 10,384 - Reviews: 49 - Favs: 44 - Follows: 52 - Updated: 5/12/2019 - Published: 12/28/2013 - Jacob, Sam, Seth, OC
Teen Mermaid by Grimm48 reviews
Summary: Takes place after Teen Wolf S1, Allison broke up with Scott and his mother was bitten by Peter and didn't survive meaning he has to go live with his aunt in Australia, where he meets three teenaged Mermaids. Pairing: Scott x Emma
Crossover - H2O: Just Add Water & Teen Wolf - Rated: M - English - Romance/Supernatural - Chapters: 2 - Words: 3,841 - Reviews: 5 - Favs: 22 - Follows: 25 - Updated: 5/1/2019 - Published: 4/28/2019
House of Mermaids by amorousintrovert reviews
When Cleo signed up for an exchange program to go to her cousin Nina's school, she didn't expect to be met with unexpected visitors, ancient curses, new friends and budding romance. And she thought being a mermaid was as crazy as her life could ever get.
Crossover - H2O: Just Add Water & Het Huis Anubis/House of Anubis - Rated: T - English - Drama/Romance - Chapters: 11 - Words: 14,982 - Reviews: 22 - Favs: 29 - Follows: 28 - Updated: 3/18/2019 - Published: 10/16/2014 - [Cleo S., Jerome C.] Charlotte W., Nina M.
Staring At The Moon by JustAnotherObsessedFangirl reviews
Tim goes to Australia to spend some time with his cousins the Gilberts and find that Emma is hiding something.
Crossover - Batman & H2O: Just Add Water - Rated: K - English - Chapters: 1 - Words: 3,924 - Reviews: 1 - Favs: 15 - Follows: 16 - Published: 1/30/2019 - Complete
Challenges by foxwolf101 reviews
crossover and regular storys for u to try
Crossover - Katekyo Hitman Reborn! & H2O: Just Add Water - Rated: M - English - Family/Adventure - Chapters: 1 - Words: 337 - Reviews: 1 - Published: 1/29/2019
Real by JustAnotherObsessedFangirl reviews
What is real and what is just a story? Magic or science fiction, or maybe they are the same thing as Cleo came to find when the comet came.
Crossover - Stargate: SG-1 & H2O: Just Add Water - Rated: K - English - Chapters: 1 - Words: 1,667 - Reviews: 1 - Favs: 4 - Published: 12/17/2018 - Complete
0 Sabrina the Teenage Witch: Meets The H20 mermaids by kyubi2020 reviews
Set after Graduation and soul mates. After marriage Sabina and Harvey moved back into the aunts' old Victorian house with Sabina staring her new teaching job at her old high school, with Harvey starting his job at the office, but life is about to change as the arrival of Cleo, Rikki and Bella soon beings events to an head, which could affect both the mortal and magic realms.
Crossover - Sabrina the Teenage Witch & H2O: Just Add Water - Rated: T - English - Adventure/Romance - Chapters: 1 - Words: 3,939 - Reviews: 2 - Favs: 2 - Follows: 1 - Published: 10/13/2018 - OC - Complete
One Moon Cycle by TasiMom reviews
I had this idea floating around about how both shows are connected with a back story. The premise is that Rita lied when she said Harry died. Harry is Harrison Bennett. I hope you enjoy it. The story takes place shortly after the last season of Mako. Not all relationships are going to be the same. So, if you don't want changes, then this might not be the story for you.
Crossover - H2O: Just Add Water & Mako Mermaids - Rated: T - English - Fantasy/Drama - Chapters: 15 - Words: 20,800 - Reviews: 54 - Favs: 40 - Follows: 42 - Updated: 9/19/2018 - Published: 2/14/2017 - Harrison B., Rita S.
Float by Spiziri reviews
The end of the summer is rapidly approaching for our heroes, but Sally has one last adventure for Percy and Annabeth in Australia.
Crossover - Percy Jackson and the Olympians & H2O: Just Add Water - Rated: T - English - Fantasy/Humor - Chapters: 24 - Words: 101,625 - Reviews: 346 - Favs: 423 - Follows: 456 - Updated: 9/7/2018 - Published: 5/13/2015 - Complete
H2O: A New Tail by CookieIsMyCaticorn
This is a 'continued' story of H2O just add water. Characters from H2O and Mako Mermaids MAY appear in this story. Just read to find out :) Btw ik the title is cringy and stuff but I am cringy anyways so... Anyways hope you enjoy. Also, the chapters are pretty short, because I am used to writing short stories that are around 6 pages long. All I need to say, thanks! *In Progress*
Crossover - H2O: Just Add Water & Mako Mermaids - Rated: K+ - English - Fantasy/Friendship - Chapters: 3 - Words: 2,531 - Favs: 3 - Follows: 2 - Published: 7/20/2018
A new kind of mutant by Puolalainen25 reviews
The story takes place during X-Men: First Class, when McCoy and Xavier use a prototype Cerebro to locate mutants. They were told by a guy in a bar to go away in not quite polite way a few days ago but Charles has just found a track of new mutant.
Crossover - X-Men: The Movie & H2O: Just Add Water - Rated: T - English - Supernatural/Drama - Chapters: 9 - Words: 14,059 - Reviews: 5 - Favs: 12 - Follows: 15 - Updated: 7/1/2018 - Published: 7/20/2017 - Erik L./Magneto, Charles Xavier, Sebastian S.
The secrets by xxStayStrongxx reviews
What happens when Miley Stewart who is secretly Hannah Montana meets Cleo, Rikki, and Emma who happen to be mermaids? Will they find out each other's secrets?
Crossover - Hannah Montana & H2O: Just Add Water - Rated: T - English - Drama/Friendship - Chapters: 5 - Words: 4,516 - Reviews: 12 - Favs: 8 - Follows: 11 - Updated: 6/11/2018 - Published: 8/22/2012
Deep Red by Sellybelly411 reviews
Emma has returned to Australia! Cleo, Rikki, and Bella are overjoyed to have her back. Lyla, Nixie, and Sirina are having trouble re-gaining Zac's trust. Meanwhile there's some trouble brewing in the sky. A blood moon. It can turn our four into permanant mermaids forever. Can Lyla and the others figure out what they are before it's to late?
Crossover - H2O: Just Add Water & Mako Mermaids - Rated: K+ - English - Fantasy/Adventure - Chapters: 9 - Words: 5,110 - Reviews: 29 - Favs: 40 - Follows: 41 - Updated: 4/16/2018 - Published: 1/9/2015
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