This is a crossover between My Little Pony: Friendship is Magic and H₂O: Just Add Water.
Twilight Sparkle, Fluttershy, and Rainbow Dash are swimming in the pool on Knacker Island under a full moon, and become mermares. They're not all necessarily very happy about it.
Also Flash Sentry is randomly a rich kid that nopony likes.
Warning: this story would be tagged [Random] [Comedy] if it had turned out to be funnier. It's kind of a silly parody crossover thing. If you want a sensible crossover between H₂O and My Little Pony, try H2O: Just Add Friendship by Jaded Naruko (or just stop wanting that).
Cover is based on art by tashiepie and toonham. Pre-read and made slightly less awful by Remedyfortheheart and Infinity Shade. ♥Thanks♥!
Chapters (1)
Please, let this be more than a one shot
6066773 It's a one-shot for now, unless it somehow proves outrageously popular, in which case I might continue it, though I would probably diverge more from H₂O's storyline. There are some aspects of the story that I like, like snarky Twilight, and Flash Sentry's characterization — they're quite fun, so I'm kind of tempted to continue because of those.
I remember this show! Long time since it was in my mind!
SHOO BE DOO SHOO SHOO BE DOO. Oh eh... Actually no. As always you made your usual amazing work. And also made everyone hate Flash Sentry, that's bonus
Everyone hates flash.
Snarky twilight is best twilight.
Side note: I fic with twilight and flash that does involve shipping, sorcery!
6066790
oh how i remember the show this is parodying, I completely despise it... WELL LETS START READING THEN!
Edit: ok first of i feel like this is just the first episode of H2O with different characters and locations, second of you could have fixed some of the problems by changing the characters up a bit like instead of twilight, Rainbow and shy, you could have used applejack with her near incapability of lying, Rarity being dramatic about the situation and Pinkie being.... well pinkie (also that would have fixed the problem with the wings
)
also this story feels a bit too rushed and characters behaving a bit out of character (excluding flash, this story has much better character development than the show).
I am sorry but this gets a thumbs down from me.
btw not fact checking my first statement in the edit, like i said i despise that show
6068044
Well, Twilight and Flash fulfil the roles of Rikki and Zane in H₂O. In the series, Zane starts off as an antagonist, but does eventually become an ally and has an on-again-off-again relationship with Rikki. So if I did continue this story, they would eventually get shipped I suppose, but I'd like to hope that my Flash would be a slightly more interesting character than the canon Flash, so wouldn't invoke the usual FlashLight rage. But I don't really imagine that I'll continue this cross-over.
Hah! What a strange thing to make a crossover out of. I like it.
6069132
Some time after I started this, but before I published it, somebody else wrote an H₂O crossover. They've taken the concept a lot more seriously than I did, and the results so far are not bad.
Must have MORE!!!
... Huh. Not who I expected the characters to be, but I like it. Was certainly interesting - and hilarious to boot. I kinda thought it would go like this:
Twilight - Emma
Fluttershy - Cleo and
Rainbow Dash - Rikki
H2OHNO
Surprised they didn't become sirens, what with the whole "surrounded by sirens" thing.
6070283
I have my reasons. In H₂O, Rikki is new in town, whereas Emma and Cleo have known each other for a while. This matches up with Friendship is Magic, where Twilight arrives in Ponyville in the first episode, but Fluttershy and Rainbow Dash have known each other since fillies. Also in H₂O, Emma is the champion swimmer, which matches up with Rainbow Dash's athleticism.
Also, it's funny with Twilight being the sarcastic one. She does occasionally show sarcasm in Friendship is Magic, but not enough for my liking!
So don't go thinking I didn't think this thing through. I spent literally dozens and dozens of seconds on it.
6070957
Very true, very true. I can see it now! And I see what you mean about Sarcastic!Twilight - I wish she showed that side more too, it's always brilliant.
6070963
One of my pre-readers did suggest that I should have swapped Rainbow and Twilight around though, so you were not alone in that thought.
Overall, not a bad concept, but it really just felt forced in a few places. Outright ignoring (but still lampshading) certain details, made it feel off. Instead of Pinkie appearing to point out the wings bit, Rainbow could have cramped her wing, Fluttershy is too timid to fly the distance, and Twilight doesn't want to leave her friends alone.
Another thing that felt off is suddenly making Ponyville a costal town. Its essential for the plot, but was still a little jarring.
It was a decent first chapter, and I would be interested in more as long as is diverged from H2O's storyline.
Just more thoughts on the story. I was on mobile last time, so I couldn't really comment well.
I guess the setting and the source material didn't really mesh well. We have a Ponyville on the cost, speedboats in Equestria, and rich stallion Flash. If some of it was at least explained, it would be better. For example, Death Note: Equestria bothered to explain how and why broadcast crystals (essentially TVs) became so common.
On the other hoof, the magical boat source was a nice touch.
For most of it I was thinking how it would be better with the EqG counterparts rather then with Ponies. Since MLP is already a fantasy setting, the discovery of 3 mermares wouldn't seem so unusual. There doesn't really seem to be a reason to keep quiet aside from keeping a secret for the sake of it. I suppose Dash doesn't want to be treated like a freak, Fluttershy doesn't want the attention, and Twilight doesn't want to alienate her teacher. Perhaps if there was some kind of bad stigma on Mermares, there would be some incentive to hide it. Perhaps hearing some Siren mythology from Pinkie could reinforce their resolve to keep this on the down low.
Where was I? ... Oh Yeah.
With the EqG setting, there's still enough trace magic in the world to distinguish itself from the H2O setting, while keeping the idea of Mermare powers unique. It would also justify boats, jerkface Flash, and Rainbow entering a swimming competition. Canterlot is also a fairly unknown setting, so making it a coastal city doesn't seem so unusual.
6070957 This could be taken a step further if you used the EqG setting with Human!Twilight. She's practically unknown at Canterlot High. I could also see her as the 'Lewis' of the story, or alternatively, the main antagonist that keeps trying to expose the secret.
If you insist on using the Pony counterparts, you could at least ignore the canon from the show and write in your own setting instead of trying to cram the FIM set pieces into the H2O setting.
Again, I still think this is a cool concept. I'm not trying to bash this at all. I'm just stating what I did and didn't like about it.
6073293
Ponyville being on the coast is actually the main reason I added the AU tag to the story. In canon, Ponyville has a river, but is quite far inland.
The story is actually intended to be silly, and random, and weird, and seem a little forced. I don't plan to continue this story any further, but if I did, it would probably get sillier, and randomer, and weirder, rather than becoming more sensible and better thought out. If you want a sensible meshing between H₂O and My Little Pony then you want H2O: Just Add Friendship. I do feel slightly guilty that my little story has gotten more attention than it.
HOORAY!
Awesome, another H2O MLP story!
I just discovered H2O recently and love it. Your story was fantastic and very random and funny. I know you said you wouldn't be continuing this story, but even as it it's a great read. And if for some reason you ever did decide to continue it, would love to read more! 
Did Rainbow and Twilight switch bodies or something?
I like this
Yeah, this part is a major switch in Twilight and Rainbow's character XDD
Great job! <3
6236004
Yeah, I know, I know. I must confess that writing the ponies to be as close as possible to their canon characterizations was not at the forefront of my mind when I wrote this.
In fact, I have no idea what was going on in my head when I wrote this.
6236024
Oh well XD
Can you do a sequel?? Please??
Fluttershy as Cleo is good. But rainbow dash is more of a Rikki then Twilight. And twilight is more of an Emma too. Emma is a bookworm. Pinkie as Lewis is okay.
Second problem is the powers are wrong. Cleo moves water Emma freezes it and Rikki boils it which wasn't found out until episode 2 pool party
Flash as Zane? Seriously? I know people don't like him, but he has literally done nothing to deserve that hate. Wait, now I remember that Rikki and Zane have a rocky relationship in season 2. Now it makes sense. But wouldn't it have made more sense to make Flash Lewis, Twilight Emma, and Rainbow Rikki. I'd go by personality, not just preference.
7388868
You're using the word "seriously" with regard to this story? Seriously?
7388892 You just did as well. Whether or not it was used to emphasize a point, it's still hypocritical.
And that is just a taste of a debate I wish not to take part in.
Dislike Flash much? Just curious
7389236
I don't write about characters I dislike.
I think this is weird enough to qualify as Random. My biggest problem is that a lot of the dialogue is copied word-for-word from the first episode of H2O. Also:
This made me wonder why you decided to focus on tje characters you did.
Wow. Just wow.