Titular Protagonists | Atlantica Royalty and Associates | Other Residents of Atlantica | Residents of Prince Eric's Castle | Allies | Antagonists
Introduced in the first film
Flounder is a major character from The Little Mermaid franchise. He is Ariel's best friend and despite his name, he is not a flounder, he is a tropical fish.
- Adaptation Personality Change: In the third movie, which is supposed to be a prequel to the first movie, he acts much more brave and extroverted for some unexplained reason.
- Adorkable: A cowardly talking fish. He's cute and beautifully coloured in blue and yellow.
- Babies Ever After: Return to the Sea shows that Flounder now has five kids.
- Character Development: In the sequel, Flounder has grown more braver at dealing with potentially dangerous situations.
- Childhood Friends: In the TV series with Ariel.
- Cowardly Lion: When Ariel is in trouble, he comes through for her without hesitation.
- Cowardly Sidekick: At the beginning of the first film. In the prequel, Flounder was more adventurous and outgoing; a stark contrast to the first movie. It can be reasoned that he became more nervous and cautious when he befriended Ariel.
- Deadpan Snarker: Shows a more witty attitude in the sequel. Mostly towards the idea of Scuttle helping.Flounder: We're doomed.
- Formerly Fit: As an adult, he gains a noticeable gut.
- Freudian Trio:
- The Ego (more rational than Ariel but more laid back than Sebastian) to Ariel's Id (fiery and emotional) and Sebastian's Superego (overly strict and logical).
- Same as above, but replace Ariel with Scuttle (an impulsive Cloudcuckoolander).
- Good Parents: Flounder is shown to be a good father to his kids in the sequel, despite not having that much screentime.
- Informed Species: Flounder does not look anything like an actual flounder, though he might be named after the verb instead of the fish. The Disney Wikia says that he is a juvenile Atlantic Blue Tang (seeing as he is yellow), which gets bluer as it gets older.
- Interspecies Friendship: His best friend is Ariel (mermaid), as well as Sebastian (crab) and Scuttle (seagull).
- Loose Lips: He accidentally blurts out that he and Ariel explored near the surface of the sea.
- Multiple-Choice Past: On how he and Ariel met. The TV series shows that they met when Ariel was still a child, while the third film shows Ariel to have been older.
- Nervous Wreck: Flounder scares easily and is prone to panicking under stressful situations, especially when he goes on adventures with Ariel.
- Nice Guy: He is sweet and loyal.
- Only Sane Man: He usually warns Ariel about the repercussion of her adventurous antics, and even gets nervous when it looks like he's going to be in any type of danger.
- Papa Wolf: In the sequel. He's quick to respond to one of his kids crying for help, and is even protective of Ariel's kid.
- Shipper on Deck: For Ariel/Eric. He even surprises Ariel with the statue of Eric that sunk after the storm and spends the rest of the movie trying to get Eric to kiss her.
- Tagalong Kid: To the Catfish Club Band in the prequel.
- Took a Level in Badass: While he would always help Ariel in whatever scary predicament she got themselves in, he had the attitude of more of a Cowardly Lion. Come the sequel, he doesn't once hesitate to go into a scary situation or take on the Big Bad or show any sign of fear in front of said villain.
- Undying Loyalty: To Ariel. Despite being a Cowardly Lion and Nervous Wreck, Flounder will always come through for Ariel when needed, to the point where he's not only her closest friend, but her most loyal one.
Introduced in the sequel film
- Satellite Character: They get little characterization outside of being just Flounder's kids.
- Strong Family Resemblance: They all look exactly like their father, especially the one that Ariel mistook as Flounder.
- Youthful Freckles: One of the guppies has them and is just as energetic as his siblings.
Alex is one of the three merteens Melody met while in Atlantica. He and she quickly developed an interest in each other.
- All There in the Manual: His name was revealed in side materials.
- Ambiguously Brown: Alex has deeply tanned skin, green eyes, and blond hair.
- Big Ol' Eyebrows: He has thick, square-like eyebrows.
- Dark-Skinned Blonde: Alex has blond hair and a noticeable tan.
- Flat Character: Not a lot of characterization.
- Hair of Gold, Heart of Gold: Alex has blond hair and has shown to be a very generous person.
- Identical Stranger: Alex looks very similar to the unnamed boy that danced with Melody at her birthday party.
- Implied Love Interest: To Melody. They bump into each other from the back twice. There has been a few hints of romance between the two, but it is unknown if they are truly in love. Melody's facial expressions and body language even shows that she is not in love with the merboy, she does find him attractive.
- Interspecies Romance: Alex (merman) apparently has feelings for Melody (mer-human).
- Multicolored Hair: Most of Alex's hair is blond but he has strands of brunet and white-blond hair.
- Nice Guy: When Melody accidentally bumps into him, he (at the same time as Melody), apologizes. He then greets her, politely asks her name, and even (along with his friends) invited her to hang out. He's too sweet.
- Satellite Love Interest: Really don't get much depth other than him being a Nice Guy and having a mutual attraction with Melody.
- Younger Than He Looks: Alex has a muscular build that could could lead one to mistake him as a 15-year-old, but he's around Melody's age (which is 12).
Introduced in the prequel film
The Catfish Club Band are a quartet house band in the Catfish Club, the underground music club in Atlantica that exists in opposition to King Triton's ban on music in the prequel. Their bandleader and vocalist is Sebastian, who also plays maracas. Other members are Ray-Ray, a sky-blue manta ray who plays the bass; Cheeks, a green blowfish who plays the saxophone; Ink Spot, a violet octopus who plays the piano; Shelbow, a teal sea turtle who plays the drums.
- The Cameo: They made brief appearances in the first film, but had no introduction or lines.
- The Casanova: Ray-Ray is the resident womanizer of the band.
- The Charmer: Ray-Ray, either with the ladies or with his pals.
- Everything's Squishier with Cephalopods: Ink Spot.
- Evil Sounds Raspy: Inverted with Cheeks. He has a raspy voice, but is a definite good guy, along with his friends.
- Meaningful Name: Ink Spot is an octopus who will spot ink whenever he is stressing out.
- Nervous Wreck: Ink Spot will squirt ink whenever he is nervous.
- Nice Guy: Despite some of their flaws, they are a nice bunch, who will help their friends.
- Only Sane Man: Shellbow is the calmest of the group.
- True Companions: They ultimately prove this in the climax.
Introduced in the TV series
Urchin is a supporting character from The Little Mermaid animated series; he's a young merboy who becomes one of Ariel's best friends.
- Dogged Nice Guy: To Ariel.
- Happily Adopted: He starts out as being an unofficial member of the King's court, before being unofficially adopted by the King and his daughters.
- Hot-Blooded: Prone to jump to conclusions easily.
- Jerk with a Heart of Gold: He's not exactly a jerk, but he was a bit of this trope in his first appearance, and tends to be a prankster. But other than that, he's an okay guy.
- The Prankster: In one episode, Urchin pranked Ariel's sisters as they were getting ready.
- Precocious Crush: It was implied that he had one on Ariel in "Marriage of Inconvenience."
- Punny Name: An urchin is a spiny marine life form. It is also a term for a punk kid.
- Smooch of Victory: He gets one on the cheek from Ariel after he helps stop King Louie from stealing the treasure in the kingdom.
- What Happened to the Mouse?: We never see what happened to him after Ariel left for 12 years (especially since he mentioned that he would be upset if she ever left him).
Pearl is a young mermaid featured on The Little Mermaid television series as well as the Marvel Comics serial.
- Ascended Extra: She had three major roles in the Marvel Comics, two being in The Little Mermaid serial, and the last being in Disney Comic Hits!
- Bratty Teenage Daughter: Taking advantage of her parents' trust qualifies her as one.
- Fatal Flaw: Her thrill-seeking actions often lead to Ariel, as well as herself, getting in trouble.
- The Leader: In Issue 3 of the Marvel comics, Pearl was the leader of a club known as the Daredevilfish Club that involves doing some risky dares to allow joining up.
- Life of the Party: She loves parties.