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In General
- Bare Midriffs Are Feminine: Unsurprisingly for a toy line based mermaids, the main four protagonists are all girly characters who wear clothing that exposes their stomachs.
- Curtains Match the Window: Almost every single character's eyes match their hair.
- Long Hair Is Feminine: Every female character has long hair that reaches at least waist lengthnote and are all pretty feminine (except maybe Dev). In the stock art, the mermaids’ hair reaches series, it stretches down to their ankles.
- Morphic Resonance: In human form the Merfriends keep their tops, but gain skirts and shoes which carry some bit of holdovers from their tails.
- Punny Name: Most characters in the show have an ocean-based pun for a name.
- Secret Identity: The Merfriends have to keep their mermaid halves a secret from all humans or they can't go back to the surface anymore.
- Voluntary Shapeshifting: The Merfriends are in their true forms when underwater; they turn into humans when dry.
The Merfriends
Searra
Searra
I’m mermazing for shore!
"Searra, takin' shellfies, fishionista splashin'"
Voiced by: Amy Correa Bell
The self-proclaimed glamorous member of the group, who's up for the latest fashions.- It's All About Me: Downplayed as she's not malicious about it, but her self-absorbed behavior annoys the others, not to mention her phone addiction got them discovered by Cora.
- Phoneaholic Teenager: As she says herself in Episode 3, she "can't live without her shellphone".
- Power Glows: She has a mesmerizing glow as stated in her profile.
- The Fashionista: She loves "kriller" fashion as stated in her intro-vid.
- Unexplained Accent: Searra has an unexplained Spanish accent despite likely being from the same place as the rest of her friends.
Oceanna
Oceanna
Let's catch a wave!
"Oceanna fast for shore, mermazing action'"
Voiced by: Marion Toro
The tomboyish member of the group who loves sports, such as surfing.- Academic Athlete: The most active and sporty of the group with her favorite subject being science.
- Passionate Sports Girl: Oceania wears wetsuit inspired "athleisure" and loves surfing and speed.
- The Leader: She's the one who seems to be in charge out of the four.
- Super-Speed: Her profile says she can swim or run very fast.
Mari
Mari
New shell phone, who dis?
"Mari got that siren call, yeah, she can sing so high'"
Voiced by: Danielle Judovits
The smartest member of the group, known for dressing in wild punk-esque clothes.- Animal Motif: Has an octopus motif.
- Beautiful Singing Voice: Is described as having hypnotic vocals in her profile.
- Deadpan Snarker: She's quite snarky and speaks in a somewhat deadpan manner.
- Glass-Shattering Sound: Her singing can break glass as seen in Episode 7.
- Never Bareheaded: She never once takes off the octopus tentacle headband she wears.
Finly
Finly
Na-mer-ste!
"Finly talkin' dolphin, yeah, she a little wild'"
Voiced by: Brianna Knickerbocker
The sweet but shy member of the group, who likes boho styles.- Granola Girl: Heavily downplayed, but her bohemian-inspired fashion, love of yoga, veganism and phrase "save the sushi" seem to point her in this direction.
- Informed Ability: According to her student ID, Finly has the ability to communicate with animals.
- Light-Haired Swimmer: Finly is blonde and loves to swim. Fitting, since she’s a mermaid.
- Speaks Fluent Animal: She can speak any animal language, land or sea, as her profile says.
Doll Exclusive Characters
Raynea
Raynea
- Gamer Chick: Complete with a 2010s pixel look!
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Screwed by the Merchandise: Due to the line's cancellation, she never appeared in the TV series and lacks any sort of catchphrase, merpower and other information that the other dolls have. - Nerd Glasses: Wears a pair of thick, black frames.
Webseries Exclusive Characters
Cora
Cora
A sweet, little, happy clam
Voiced by: Triya Long
The Merfriends' best friend who's a lifeguard and blogger for Mermaid High, and the only one who knows their identities as mermaids.- Light-Haired Swimmer: She's a blonde lifeguard so this is a given.
- Hair of Gold, Heart of Gold: Cora has blonde waves of hair and is a "sweet little happy clam" with a good heart.
- Mrs. Exposition: Her appearance in Episode 2 consists of her informing the Merfriends and viewers of several key characters at school.
- Secret Chaser: Initially this upon discovering the girls' secret.
- Secret-Keeper: The only student of Mermaid High who knows the girls are mermaids.
Catalina
Catalina
A stingray with a side of jelly.
Voiced by: Brianna Knickerbocker
Mermaid High's surf star and most popular student who loves to be in the spotlight.- Alpha Bitch: Catalina is stated to be a "stingray with a side of jelly" who loves being queen in Deep Dive Episode 2, heavily implying she is this. In episodes, she's shown to be egocentric, demanding and dismissive, throwing water on Searra during the Winter Dance Concert because Searra had repeatedly taken her spotlight.
- Attention Whore: Catalina demands that she be paid attention to while surfing in Episode 4 and becomes angry when Cora doesn’t comply.note
- Acquired Situational Narcissism: Deep Dive Episode 4 implies that once she became surf star, her ego increased exponentially.
- Even Evil Has Standards: She's not "evil" per say, but in the background of Episode 5, she expresses clear surprise and shock at Dev's hostility and actions.
- Hartman Hips: A shot of her in her wetsuit shows her hips are much wider than her chest.
- Light-Haired Swimmer: Catalina is stated to be a surf star in Episode 2.
- Secret Chaser: To the Merfriends along with Devin.
Devin
Devin
Your BFF one minute; frenemy the next
Voiced by: Carrie Bernans
Pierleader captain of Mermaid High who frequently antagonizes the Merfriends.- Beta Bitch: Devin is introduced as “Catalina’s BFF”, though she's much worse personality-wise.
- Bitch Alert: In her first physical appearance, Devin shoves her way between the main characters and orders them to stay away from Xavier.
- Cruel Cheerleader: She's the Pierleader captain and is a royal jerk towards everyone.
- In-Series Nickname: Dev.
- Only Known by Their Nickname: She goes by "Dev".
- Tsundere: Implied. Cora states she's your "BFF one minute; frenemy the next", meaning she might be some form of one.
- Clingy Jealous Girl: Ex-girlfriend example, but when she says to not go near X, she means it as evidenced by her trying to throw water onto Finly for pairing up with him for a class.
- Secret Chaser: Along with Catalina, to the Merfriends.
Xavier
Xavier
The smartthrob.
Voiced by: Zeno Robinson
Devin's ex, a lover of karaoke and a vegan skateboarder who's the coolest guy at Mermaid High.- In-Series Nickname: X.
- Nice Guy: Perfectly amiable when he shows up in Episode 5.
- Only Known by Their Nickname: Everyone calls him "X".
- The Smart Guy: Deep Dive Episode 5 states that he's top of his class and a "smartthrob".
- Why Did It Have to Be Snakes?: Deep Dive Episode 5 reveals that he's afraid of ferris wheels
Josh
Josh
"You don't need to run to get your heart rate up around him.
Voiced by: Zeno Robinson
Catalina's ex and the subject of both Oceanna's and Searra's crushes.- Academic Athlete: Deep Dive Episode 2 states that he "has many, many thoughts" and loves deep conversations.
- Lovable Jock: He surfs and offers to show Oceanna how, as well as being nice to the girls in general.
- Nobody Touches the Hair: He doesn't let anyone touch his hair according to Deep Dive Episode 2.
Claire Rosinkranz
Claire Rosinkranz
"Can you keep a secret?"
Voiced by: Claire Rosinkranz
E- As Herself: She voices herself, though whether or not she makes popular music in this universe is left unclear.
- "Do It Yourself" Theme Tune: She sings the theme song in real-life and in the show (at the Winter Dance).
- Diegetic Soundtrack Usage: The theme song is sung in-universe for a school dance party.
Coach Sue Nami
Coach Sue Nami
Nami needs nom nom
Voiced by: Marissa Meizel
A phys. ed. coach and teacher at Mermaid High who's less than sane.- Big Eater: Her first scene in episode 5 is her messily chowing down on sushi, and after giving the assignment declares "Nami needs nom nom".
- Dissonant Laughter: Likes to laugh maniacally for no reason as seen in episodes 3 and 5. She sounds like a maniac usually, and her laughter emphasizes her craziness.
- The Faceless: In Episode 3. Averted by episode 5 where her face is shown at the very beginning.
- Punny Name: Sue Nami sounds a lot like "Tsunami".
