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All About Cleo

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Cleo Sertori Picture - H2O

Cleo Sertori

Before a magical moonlit night changed everything, Cleo was a shy, awkward girl with no idea how to swim. Once she transformed into a mermaid, she had to get past her watery fears and dive right into a new identity. Now she's stronger and more self-confident, but she also has more secrets. Emma and Rikki are braver than Cleo is, but ready or not, she's in for a major adventure.

Special power: Cleo has the ability to move and control water, just by thinking about it.
Typical quote: "Why me? I didn't ask for this to happen."

BackgroundEdit Background section

Cleo Sertori grew up in a family consisted of herself, her father Don Sertori, mother Bev Sertori, and younger sister Kim Sertori. Don is a successful fisherman and owns three fishing boats and can employ others into his service. While Don tends to work a lot at the harbor, Cleo's mother stays home a lot since she is a housewife. Cleo claimed that she had known Lewis McCartney since they were five years old and never once had she seen him get angry or frustrated. Later on, she met Emma Gilbert and the two of them became good friends. While her birthday parties seems fun at first, Cleo became to despise them as she got older, because her father and sister insisted on giving her a childish party. The two knew each other well enough where Cleo knows that Emma is always prepared and Emma knows that she is toned-deaf

Although not as wealthy as Emma's family, Cleo's father's fishing job enables them to have enough money to live in a house by the canal. It is revealed in "Moon Spell" that she is Lactose Intolerant. Unlike Emma, Cleo doesn't get along with her younger sibling. At most, they would both argue and get on each others' nerves as much as possible to the point where it would drive their parents insane.

Aside from her family, it is revealed that Cleo also has a cousin, Angela Sertori, who is even more deceitful and manipulating than Kim when she tried to trick them into accusing each other while she went body-boarding herself.

Her friendship with Lewis remained as just friends, although Lewis had developed a crush on her sometime later on. Cleo doesn't respond to his crush until the end of series one, but she continues to display a caring attitude towards him and would encourage him many times whenever he's feeling down.

Because Cleo and Emma are best friends before Rikki Chadwick came, they both understand each other more and both of their families get along well. Because Emma's family does associate with Zane's, Cleo and Lewis comes to be familiar with him as well. Although unlike Emma, Cleo is more weary of Zane, especially when he kept pulling pranks on her.

In the first few episodes of series one, Cleo seems to have a small crush on Byron, but she later gave up on him for Emma's sake.

Before she became a mermaid, Cleo is afraid of the water and could barely swim. She also tends to rely on Lewis for academic success in the first two seasons. After he left to study in America, Cleo took upon herself to study more and was able to achieve by getting an honorable diploma.

PersonalitiesEdit Personalities section

In contrast to Emma and Rikki, Cleo is often awkward, insecure, and a little shy. She is the most "girly" out of the three and is well intentioned. She is the most empathetic out of all three girls as she share a closer bond with sea creatures. Cleo loves her fish and enjoys taking care of them extensively. When Pluto, one of her salt water fish, died, Cleo became sadden by his departure. Unlike Rikki, Cleo believes that fish are just like people that live, eat, and play underwater. Another sea mammals that she is mostly empathetic to are the dolphins. At the marine park where she works part-time, Cleo shares a close bond with a dolphin named Ronnie.

Unlike Emma, Cleo tends to lack confidence when it comes to getting things done. But often times she would need the right push and encouragement to be able to perform a task she once thought impossible. And unlike Rikki, Cleo tends to be more responsible and less rebellious than the tomboy, but she does often show some display of being carefree from time to time. Sometime she doesn't listen to people, mostly her sister, and this would often lead her into various troubling or embarrassing situations.

Aside from her girly personality, Cleo is the most naive. She would put too much of her faith into people even in situations when it seems to be hopeless. Whenever a friend or a family of her is being accused, Cleo wouldn't hesitate to defend that person. Despite knowing the worst, Cleo would continue to deny the negative truth being pointed out by her friends. All in all, Cleo would believe in her friends and family right up to the end.

Often times Cleo is the one being stuck in the middle of an argument between Emma and Rikki whenever they fight. Often playing the peacemaker, she tends to find herself torn between her two friends, especially when she insists on not taking one side or the other.

AppearanceEdit Appearance section

Cleo has wavy brown hair that stops mid-back and hazel-green eyes. She is quite beautiful despite some of her insecurties. Throughout the series, Cleo would often arrange her hair in various styles ranging from simple buns, braided, loose, or pony-tailed. Her skin is clear and is an extermely light tan color. She has a slender figure and is quite tall standing at 5'10. As a mermaid, her hair is let down and she has an orange-scaled tail with a matching orange-scaled top. When she works part time at the marine park, Cleo would wear a light blue polo shirt with a name tag and a navy blue baseball cap. In series three, she wore a darker navy blue and black wet suit whenever she's training dolphins for shows. She wears a lot of colorful clothes based on her ability on moving water into shapes similar to the colors of the wind. Her favorite colors are purple and pink based on her clothing.

Becoming a MermaidEdit Becoming a Mermaid section

Cleo becomes a mermaid in first episode "Metamorphosis" of season one. After helping Emma train by timing her laps, she walked home and was tricked into helping Zane Bennett repair his boat. Deciding to pull a prank, he and Nate set her adrift in his spark plug-less boat and into the sea, knowing that she could barely swim. Rikki then jumps aboard the boat and places the spark plug into the engine, rescuing her. Cleo and Rikki then take the boat for a joyride. Along the way, the girls ran into Emma and invited her to come along. With the carefree Rikki steering the boat out into the sea and miles offshore, the girls soon found out that they are now out of fuel in the middle of the ocean. With little choice, the three girls paddled their way to the closest land they could find: Mako Island.

Once ashore on the deserted island, Cleo and her friends pondered on how they should call for help. Being the most prepared one in the group, Emma brought out her mobile phone but only to find that it couldn’t get a signal. Emma suggested that they should head inland towards a higher altitude in hopes of getting a signal for a call. As they ventured in deeper into the jungle-infested island, the three girls soon came across a clearing where a river stream turns into a waterfall over several boulders. While Emma and Rikki were able to jump over to the small waterfall, Cleo became hesitant and without a warning, fell into a hole. The other two followed her and continued to pursue a way out of the underground cave.

Several hours later, the three of them ended up at the end of the tunnel and found the moon cave with a pool at the bottom of the island’s dormant volcano. Emma realizes that the Moon Pool is connected to the ocean and may be their only way out, dove in to discover. Confirming her find, she and Rikki convinced the hesitant Cleo to escape with them. When all three of them entered the pool, the full moon became aligned with the moon pool, causing it to bubble and glow a mystic blue glow and emitting small orbs of magical light particles into the air. Oblivious to what was happening to them, the girls ventured out into open sea where they were rescued by the local water-police.

Upon the next morning and twelve hours after their ordeal, Cleo decided to take a morning bath. To her surprise, she transformed into a mermaid with a large tail hanging at the edge of her bath tub only ten seconds after touching water. Cleo later confirms that she wasn't the only one who became a mythical sea creature as Emma and Rikki both became mermaids as well.

Cleo is the last person to embrace her new life as a mermaid while the other two are excited, despite the obvious downside. However, she later got over her fear and hesitation and tried her best to live a normal life and was able to grow to love her new abilities.

The Marine ParkEdit The Marine Park section

In Party Girls, Cleo got herself a job as a dolphin feeder at the Sea World of the Gold Coast, to which Emma thinks it's a bad idea at first. At the same time, she becomes an ice cream girl and would occasionally help the other staff members feed the sharks and the other tank animals. At the marine park, Cleo knew that she has to stay away from water-filled rides. At times, she would even swim with the dolphins behind the other staff members' back. It was there that Cleo met Ronnie the dolphin and the two began to become friends and share a deep friendly and playful bond (although at first, she thought that Ronnie had a crush on her after seeing her as a mermaid). In the third series she was promoted as a dolphin trainer, but even that took her a while to master fully without Will's help.

Mermaid PowersEdit Mermaid Powers section


Cleo defending herself against Charlotte


Cleo possesses the ability to transform into a mermaid ten seconds after touching water. She wasn't about to transform into a mermaid until an estimate of twelve hours after jumping into the Moon Pool at Mako Island. She turns back into a human several minutes after climbing out of the the water. Once her body is completely dry, she turns back into a human along with the outfit she was wearing before she transformed. As a mermaid, Cleo has the ability to swim at super speed of 600km/h, hold her breath for more than fifteen minutes, and dive at a depth lower than any ordinary human being is capable of.

HydrokinesisEdit Hydrokinesis section

Cleo is the first of the three mermaids to discover her individual powers over water; the ability to move, shape, and bend water at her will, normally called Hydrokinesis. Her ability ranges in many forms. When moving the water, she can cause it to float in the air or spray it in a form of a water jet blast. To shape them, she manipulated the water into the air and cause them to form from simple water orbs to a miniature mermaid figurine. Her powers also allows her to multiply the water molecules, making the shape of the water to grow more and expand in sizes, despite the small amount in a glass to begin with.

Power advancementEdit Power advancement section

In the second season premiere "Control", a special full moon along with a rare planetary alignment greatly strengthens and increases her powers to much more powerful levels. In Cleo's case, she develops the ability to create and control wind, most commonly known as "Aerokinesis". When combined with Emma and Rikki's powers, she can produce hurricane-like weather. However, it appears that Cleo's power alone isn't enough to levitate a person or anything heavier - unlike Charlotte Watsford who could levitate all three girls at once, it takes all three to levitate one person. In season three, Cleo is the only mermaid who doesn't display her secondary power. It is most likely that in the episode The Sorcerer's Apprentice, Cleo couldn't use her aerokinesis to blow her bubble-imprisoned goldfish back towards her, because she was already trying to get a grip on said floating bubble with her hydrokinesis. This implies that it is possible that Cleo and the girls can't use both of their powers at the same time unless when combining their powers with each other.

RelationshipsEdit Relationships section

Lewis McCartneyEdit Lewis McCartney section

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Cleo and Lewis became friends since they were five years old. As they grew up, Lewis developed a crush on her but she was only interested in being friends with him. Later, Cleo admitted that she's falling in love with Lewis and the two started to date at the end of Season 1 after they admitted their feelings for each other. At the beginning of Season 2, after Cleo got her new powers, Lewis becomes clingy and doesn't give her enough space. Cleo then breaks up with him to find the balance. When Lewis begins hanging out with Charlotte, Cleo grew jealous. Charlotte's new friendship with Lewis made her appear closer to him in hobbies and interest, causing Cleo to become more and more weary of Charlotte. When Lewis tried to divert Charlotte's attention away from Cleo on Mako Island, Charlotte took her opportunity to kiss him and making them an official couple. Cleo is heartbroken and accepted the fact that Lewis is moving on away from her, not knowing that Lewis only did it to protect her mermaid secret from Charlotte.

After Charlotte became a mermaid, she isolated Cleo from Lewis and broke her spirit by making her believe that she's pathetic and stole her locket. When Lewis found out the truth, he breaks up with Charlotte and went to save Cleo from the sharks. He then admits his true feelings for Cleo and they both got back together. Cleo and Lewis continue to maintain their relationship in Season 3 but when Lewis receives a scholarship from America, Cleo didn't want to let him go. But knowing that she can't be the reason to keep him from achieving his dream, she accepted the choice to let him go. Though they have departed, Cleo and Lewis still maintain in contact with each other. At the end of Season 3, Lewis comes back from America to visit Cleo at her graduation. They get together and end up at the juice bar. They kiss and dance to Bella's music.

Ryan TateEdit Ryan Tate section

Shortly after Lewis' departure, Cleo develops a crush on Ryan Tate, a geologist works with her step-mother, Samantha. Kim and Bella encouraged her to date him, but Cleo decided to remain loyal to Lewis. However, she becomes wary of him when his suspicions on Mako Island goes too far.

Phoebe Tonkin


Phoebe Jane Elizabeth Tonkin (born 12 July 1989) is an Australian actress and model. She is best known for portraying Cleo Sertori in the television program H2O: Just Add Water.

Early life

From the age of four, Tonkin participated in various dance classes including classical ballet and tap. She completed various courses at the Australian Theater for Young People (ATYP) at the Wharf Theater from the age of twelve. Courses at ATYP included Shakespeare, Script to Stage, Clowning Around, and Musical Theater. She attended Loreto Kirribilli and Queenwood School for Girls in Balmoral, renowned for its excellent drama department and had private drama classes. She became involved in all school productions including Antigone, White Crane and Venetian Twins. Each year Tonkin took part in the school's Shakespeare festival culminating in winning the state final in 2005 in a Midsummer Nights Dream.


Tonkin's first television appearance was on the Australian teen show H2O: Just Add Water, where she plays one of the main characters, Cleo Sertori. While not a strong swimmer, she worked to improve her abilities during pre-production of the show. She is the youngest member of the principal cast on the show. On 20 October 2007, Tonkin appeared on the Nickelodeon UK Kids' Choice Awards, where she presented the award for best band alongside H2O co-stars Claire Holt and Cariba Heine. Tonkin's credits include appearances on the Australian series Packed to the Rafters and the film Tomorrow, When the War Began. She has appeared in various commercials, including ones for Vauxhall Motors and Chic Management. Tonkin also models, and has been in various photo shoots for catalogs and magazines such as Girlfriend.


Cleo Sertori Pictures

  • Phoebe Tonkin Picture, H2O: Just Add Water
  • Phoebe Tonkin Picture, H2O: Just Add Water
  • Phoebe Tonkin Picture, H2O: Just Add Water
  • Phoebe Tonkin Picture, H2O: Just Add Water



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01x24 - Love Potion #9

Season 1 / Episode 24: - Love Potion #9

Cleo Sertori: [on phone] Lewis, is there something you want to ask me?
Lewis McCartney: [on phone] Yeah. I was a bit embarrased to ask you infront of the other girls but...
Cleo Sertori: [hangs up phone] He wants a sample of my earwax.?

01x16 - LovesickSeason 1 / Episode 16: - Lovesick

Cleo Sertori: You are so devious, Zane.
Zane Bennett: You say that like it's a negative.



Cleo Sertori H2O: Just Add Water (AU)Season 1 / Episode 10: - The Camera Never Lies

Emma Gilbert: We've only got a few days, So I think we should go with the most developed idea, which is mine.
Cleo Sertori: You have an idea already?
Rikki Chadwick: Cleo, This is Emma we are talking about.
Emma Gilbert: I think the film should be called "My mother."
Rikki Chadwick: Sounds riveting, a thriller?
Emma Gilbert: Heroes aren't always pumped up superfreaks who fly through the air, Rikki. And besides, real heroes like my mum aren't always seen on the screen.
Rikki Chadwick: And theres a reason for that.
Cleo Sertori: Don't you think a whole three minutes on your mum might be a little...
Emma Gilbert: What?
Rikki Chadwick: Weak?
Cleo Sertori: No...
Rikki Chadwick: Self-indulgent?
Cleo Sertori: N-...
Rikki Chadwick: BORING.



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