A/N: HEYOOOOOO!

I'm back with another new Danny Phantom fic! Don't worry, Spook Island will still be updated tomorrow, on schedule, and since I've gotten multiple requests for another chapter of the Obstacle Course story, I'll be sure to work on that and have it our by Friday.

Also! I was on Instagram and found a poll from Nickelodeon about what shoe they should bring back. I went to it and idk if my vote counts, but Danny Phantom was winning with over 29% of the votes! So if the poll is still going, vote for DP! If we could get a reboot of DP that would be amazing!

Anyways, I was looking through some DP fan art and found one of him as a merman. It was really good, but idk how to find it again. I got the inspiration for Siren Song and here we are.

BACKGROUND:

Amity Park is built in Amity Bay, off one of the Great Lakes or oceans in the United States. It's sorta like a coastal city except most housing is build on reinforced boardwalks that extend over the water, and the rest is built on the beach.

Cores are no longer just elemental, but instead are almost anything. Ex. Danny has a ghost core with an ice element; Skulker has a skeleton core with a fire element; Vlad has a ghost core with a fire element; Wulf has a portal core with no specific element; etc.

The Fentons are researchers of aquatic supernatural beings they call Mermaids and Mermen. Later, it is discovered that they are actually known as Sirens.

Danny is walking along the boardwalk, coming home from Tucker's house, when a sudden storm appears and knocks him into the ocean.

The story begins from the point that Danny hits the water.

DISCLAIMER: I DO NOT CLAIM TO OWN DANNY PHANTOM OR ANY COPYRIGHTED BRANDS, CHARACTERS, COMPANIES, DEVICES, OR OTHER MATERIAL! ALL RIGHTS GO TO THEIR RESPECTIVE OWNERS! BUTCH HARTMAN CREATED DANNY PHANTOM AND NICKELODEON OWNS IT! I ONLY OWN THE STORYLINE!

Enjoy!

...LINE BREAK...

Salty ocean water slammed into him, and he choked, struggling to stay on the surface. An underwater current dragged at his legs, tugging him down.

Danny gulped in air just before the waves closed over his head. He thrashed, trying to get back to the surface, but the current just swept him down further. His eyes automatically opened, the water dark and blurry. Waves crashed overhead.

Chest growing tight, he began to grow desperate. He didn't want to die and yet it seemed as though this was his time.

Once his oxygen was gone, Danny instinctively opened his mouth to breathe and instead sucked in water. He began to choke, his vision quickly darkening.

Dimly, he saw a bright green glow moving towards him. It stopped, and he caught a glimpse of a humanoid fish-thing. The thing seemed to open its mouth and the glow began to pulse. A noise, sounding like a song, reached Danny. It was distorted and warped by the water, but the longer it kept going, the clearer it became. His vision began to clear again, the water no longer blurry.

The water in his lungs suddenly cooled, no longer burning and suffocating him. There was a small sharp pain on each side of his neck, and he could breathe again. Some white light passed over Danny, and he gasped, the last few bubbles of gas in his lungs floating out of his mouth. A scratchy, itchy feeling passed over his arms from the elbow down, and his legs seemed to lengthen and wrap around each other before molding into something new. The figure in front of him slowly let its song fade, and before he could take it in, it seemed to shudder. It shrank, and folded in on itself until it was completely gone.

Danny floated in the water, no longer affected by the waves or current. He stared at the spot where the thing had winked out of existence.

Then a lock of white hair brushed across his vision.

He yelped, and moved his hands to grab at his hair. As soon as he did, he nearly screamed.

Instead of his normal pale skin, his hands and forearms were covered in raven-black scales, almost like a fish's. His fingers were slightly pointed like claws, and had no nails anymore, just a bigger scale. He tried to kick his legs, but instead a swishing motion made him look down. A black fish tail, the scales the same color as his arms, had replaced his legs. The tail fin was white, with a black stripe on either side, and was longer than his legs had been. It melded seamlessly with his torso, the scales melding into skin just at his hips. As he touched his hands to his neck, he could feel three slits lined with scales on either side.

Danny's eyes widened. He couldn't be - No, it was impossible. Mermaids and mermen and Sirens didn't exist. Yet here he was, with a tail and gills and apparently white hair. He stuck out his tongue, tasting the salt water, and noting that his canine teeth had appeared to have become sharp and fanged. Danny continued to examine his new body, stunned when he realized that he moved extremely fast. So now he was a merman, could breathe underwater, and swim around.

He shook his head. Impossible, but then again, he was alive and breathing the ocean water.

A wave crashed above him, reminding him of where he was. He looked up to see one of the boardwalk streets of his home city, Amity Park.

Danny swam to the surface, and carefully pokes his head out. He saw only waves, wind, rain and a storm. Thankfully, no one was around to see him.

He reached up and tried to pull himself out of the water. Managing to do so, he flopped onto the wooden planks of the boardwalk, and propped himself up on his elbows. The ebony tail was still draped over the edge, white fins just barely brushing the water. Strangely, he could still breath air perfectly fine. Danny squeezed his eyes shut. "I wish I were human again!" He whispered, knowing that if his parents found him, he was screwed.

Something shivered inside his chest, and a white ring appeared around his waist. It split into two and moved over his body, changing it.

His tail returned to legs, clothes materializing over his body, and his hair went back to his normal black color. Though now he had black scales rippling up his legs to about mid-thigh, and his arms were still covered in scales up to his elbow. As he felt his neck, he could still feel his gills, and he ran his tongue over the fangs in his mouth.

Danny scrambled to his feet, staring at the stormy waves for a moment, then fled for his house.

...LINE BREAK...

A/N: So that's the first chapter!

I hope you give liked it! I'll be continuing my other dog a first, but I think I'm gonna try and maintain a schedule - Siren Song on Mondays (if you guys want more), Spook Island on Wednsdays, and one-shots or mini series on Fridays or Sundays. Hopefully I'll be able to keep to the schedule more than I did with my more Undertale-based one. Once I post all of my pre-written one-shots or mini stories, I'll work on my older fics.

PM me or send me a review if you have questions, comments or concerns! Criticism will only fuel me and I'll flame you right back.

Byeeee!

~TheDerpyPikachu98