In the vast realm of anime, anything is possible. Fantasy can become a reality, and fans can meet characters who belong in the pages of a fairy tale. From mythical dragons and elves to supernatural yokai, anime fans meet with characters with unusual appearances and even more spectacular powers and abilities.

However, as fans meet supernatural characters on land, they might start to wonder about the creatures of myth who reside in the sea. From mermaids to sea serpents and anything in between, these fin-tastic anime characters also deserve a chance to get their fins wet and splash in the spotlight.

10 Lucia Is The Mermaid Idol (Mermaid Melody Pichi Pichi Pitch)

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As a mermaid princess who uses the power of her voice to protect the ocean, Mermaid Melody Pichi Pichi Pitch's Lucia is an idol with scales and a fin. However, as Lucia continues her adventure, she trades her iconic fin for human legs.

Lucia is a magical girl of the sea who can transform her mermaid tail into legs and transform again into her idol persona. As she continues to fight, Lucia's identity as a mermaid may be a secret, but she is more than willing to expose herself, fins and all, if it means protecting those she cares about from evil.

9 Hugo Is The Helpful Water Sprit (70x13p9" title="the ancient magus' bride">The Ancient Magus' Bride)

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Hugo is Angelica's familiar and a Vodyanoi water spirit in 70x13p9" title="the ancient magus' bride">The Ancient Magus' Bride. When summoned, Hugo materializes in a cluster of water bubbles. Small in stature, Hugo has purple scales, fin-like feet, and a reptilian-like tail. Hugo floats around in the air as if he is swimming through water.

Hugo's magic also takes on a water-like quality, from looking like dew droplets to spun threads of water. Although he can be a bit mischievous, he is a hard worker and a loyal partner when aiding Angelica with magic.

8 Aquarius Is The Water Bearer (Fairy Tail)

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As one of the twelve Zodiac spirits, Aquarius is one of Fairy Tail's celestial wizards and one of Lucy Hearfilia's strongest allies. With the appearance of a mermaid, Aquarius is known for her beauty and for being a powerhouse.

To Happy, Aquarius is known as the angry fish lady, but this spirit is much more than that. With her water basin, Aquarius has the power of water at her command. Aquarius has a big temper, and fans should watch out, or she might sweep fans and Lucy away in one of her typhoons.

7 Laura Apollodoros Is A Mermaid & A Mythical Hero (Tropical-Rouge! Pretty Cure)

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In Tropical-Rouge! Pretty Cure, Laura must save her kingdom, and she will do whatever it takes to find the precures. This spitfire of a mermaid is ready for action — even if it means braving the human world.

With Laura's confidence and heart, it should be no surprise to fans that she is one of the legendary warriors she had been looking for. Now with the rest of her friends, this little mermaid is ready to face the evil Witch of Delays and save her kingdom.

6 Ryou Sukuna Is The Fearsome Dragon Lord (Kamisama Kiss)

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When fans of Kamisama Kiss! first meet Ryou Sukuna, the Dragon Lord, he kidnaps Tomoe as punishment for stealing his right eye centuries ago. With blue scales, long purple hair, horns, and an eye patch covering his right eye, Ryou Sukuna is an intimidating yokai.

The Dragon King is a mighty warrior with a craving for violence and a knack for keeping track of the debts owed to him. However, no matter how strong this dragon yokai is, Ryou becomes utterly powerless against his beloved wife.

5 Poseidon Is The God Of The Sea & Ally Of The Demon King (Sleepy Princess In The Demon Castle)

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As one of the Demon King's Ten Guardians, Poseidon is in charge of the Deep Sea Zone in Sleepy Princess In The Demon Castle. Straightforward and quick-tempered, Poseidon often finds himself butting heads with others. However, the god of the sea is weak to compliments.​​​​​​​

Twilight, the Demon King, currently employs Poseidon, even though he is a powerful and high-ranking god. When faced with Sleepy Princess In The Demon Castle's Princess Syalis and her nap-related shenanigans, this water god is just at a loss like every other Demon Castle resident.

4 Jinbe Is A Powerful Pirate Of The Sea (One Piece)

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One Piece's Knight of the Sea, Jinbe, is one of the most well-known and powerful fish-men. Once a member of the Sun Pirates and a former Warlord, Jinbe is a desired ally and worrisome foe.

As a Whale Sharkfish Fish-Man, Jinbe has a large and intimidating appearance, with his blue skin, webbed hands, and large canines. However, none of that matters to Luffy and the rest of his crew. Able to wield Fish-Man karate, Jinbe's attacks can utilize the sea to pack a real wallop. The Straw Hat's helmsman is a mighty force to be reckoned with.

3 Zed Is An Artificial Merman (Blood Blockade Battlefront)

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As a synthetically created "merman," Zed fits right in with the rest of the Blood Blockade Battlefront characters. Although Zed does not look like the traditional merman, he is genetically half-human and half-fish.

With blue scale-like skin, fin-like appendages on his forearms, and a water-breathing apparatus, Zed is definitely a fish out of water. Thankfully, this quiet and serious "merman" fits right in with the secret organization, Libra. With his Big Dipper Blood Technique, Zed is an irreplaceable member of Blood Blockade Battlefront's secret organization.

2 Wakasa Is The Mermaid Living In The Bathroom (Orenchi no Furo Jiro)

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After being saved and mistaken as a human by Tatsumi, Orenchi no Furo Jijo's Wakasa has become an uninvited house guest of his savior. The blonde merman once living in an old polluted river is now living his best life in Tatsumi's bathtub.

Wakasa is the definition of carefree, spending his days lazing around in the bath, reading magazines, playing with his favorite rubber duck, and eating hamburgers. Thankfully, his roommate, Tatsumi, doesn't seem to mind — at least, until his heating and water bills go up.

1 Elma Is A Water Dragon Living In The Human World (Miss Kobayashi's Dragon Maid)

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Elma from Miss Kobayashi's Dragon Maid is an impressive dragon. She is also Tohru's rival. Elma has a spiral brown horn protruding from her forehead in her hybrid form, a blue and green scaled tail, and a trident.

Elma, a water dragon, looks like a blue sea serpent with her trident melding into her tail. Fans of Miss Kobayashi's Dragon Maid will absolutely fall in love with this water dragon. Elma always leaves a lasting impression because of her adorable, indecisive attitude and monstrous appetite.

NEXT: 10 Anime Characters Who Are Unstoppable Underwater