The Three Mermaids

The Three Mermaids are mystical sea creatures that live at the Underwater Palace with the God of the Sea.

Appearance
Their physique is very similar, apart from their hair and eye color. One has long blond hair with a green starfish clip and blue eyes; one has long black hair, wears a golden crown and has black eyes; and one has a brown ponytail and brown eyes. They appear as beautiful mermaids with pale skin, slim bodies, seashell tops, and blue and green tails with bright blue fins.

During the song of the Kraken, they wear fake, pale red tentacles on their heads, arms, and tails.

History
The mermaids were some of the mystical inhabitants of the Moonshine Sea's briny depths. They lived peacefully in an underwater castle with the God of the Sea. Unfortunately, the Sea God's Trident was stolen. Knowing that a gaggle of sea monsters could be trouble, the Moon Bear King filled the Moonshine Sea with magic oil.

Plot
When Kutaro and Pikarina enter the secret palace, they find the God of the Sea looking worse for wear. The Three Mermaids lay on the sea bed. Like the Sea God, the mermaids' strength had been sapped by the magic oil. The God of the Sea, in his weakened form, can barely say a word, but the mermaids burst into song and explain how the Trident had been stolen by the Kraken. To restore the sea, Kutaro and Pikarina are sent to the Kraken's lair on one of the Sea God's squids.

After Kutaro retrieves the Trident, the God of the Sea heals the Moonshine Sea, and the mermaids sing their thanks to Kutaro and Pikarina. However, now that they are back to normal, they don't stop singing until the Sea God tells them to shut up. After he gives Calibrus a new power, the mermaids send Kutaro and Pikarina on a squid to the surface.

Abilities
The Three Mermaids can breathe, speak, and sing with ease underwater and are able to harmonize with each other. They are very fast swimmers and can speed and dash through the water with their blue-green tails. They are also able to communicate with other sea creatures. They are surprisingly strong, shown when they carried a large squid, Pikarina, and Kutaro as if they were as light as a feather.

Introduction
Water's up [water's up?] in the Underwater Palace? 'Sposed to be the Sea-God's home and free from greed and malice Where the water's clean enough to see into the stratos... phere! We're glad you're here!

Trident
Pointy spears [pointy spears] Yes, a Trident [it's called a Trident!] Triple-pronged and extra long, the Sea-god's pride and joy, and Pointy ears [pointy ears?] are something else [belong to elves!] ...The Trident could banish evil, But it's gone.

The Moon Bear King [yes, the Moon Bear King] knew the Trident had been stolen And his oil springs made the ocean black as tar And the sea couldn't even stop it, 'cause his powers, they were barred...

Kraken
Kraken Kraken Kraken Kraken... Oh, the legendary horror, how it chills my scales Seized the Trident with the force of eighteen hundred tails Kraken [Kraken!] Before whom every other monster pales!

A hero with scissors will save us! He's a wizard With Calibrus he'll bushwhack The Kraken! And get the Trident back because... The Sea-god needs your help, great hero! And your pixie friend Pretty please, we're on our knees! Okay, we don't have legs

[Pikarina] We're on the job! After all, you guys were robbed, And anyway he is a hero Not a zero, wait that rhyme's already played, And by the way! I'm not a pixie, I'm the daughter of the Sun We fight as one! For truth and justice! All the Moon Bear's jerks!

[Mermaids] That's great, you big mouth! Now get to work

Return
A pointy spear [pointy spear] Yes, a Trident [it's called a Trident!] Triple-pronged and extra long, the Sea-god's pride and joy!

Trivia

 * They and their singing are likely a parody of The Little Mermaid or a reference to the sirens, three water nymphs whose songs lured sailors to their doom.
 * They seem to dislike Pikarina because she started to sing during their song.
 * Their color scheme is very similar to the mermaids in the Disney movie Peter Pan.