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Isabella Hartley

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Isabella "Bella" Hartley

Bella's Tail

Portrayed By:
Indiana Evans
Jamie Ellen Ewing (younger)
17-18 (Season 3)
Human (formerly)
First Appearance:
Last Appearance:
Homecoming (Indirectly mentioned)
Unseen and Unnamed Parents
Best Friends:
Love Interest:
Will Benjamin (boyfriend)

Isabella "Bella" Hartley is one of the main characters in the third and final season, in the Australian television series, H2O: Just Add Water. Bella discovered her powers after her trip to the Sea Caves of Ireland. She is portrayed by Indiana Evans.

Personality and Character

Bella is a bit withdrawn and sensitive because she's a mermaid, meaning that she can be afraid to reveal herself, but cares deeply for her friends (especially Will Benjamin, because of her feelings for him). Bella is also described as being a bubbly ball of energy that is easy to talk to. She enjoyed walking around in Ireland fields while her parents were both at work. Later she became a fun loving girl with her new two friends.

Rikki's Café

Bella initially tried out for a waitress job at a café called Rikki's, but Sophie Benjamin foiled her chance by adding a spice in a customer's drink in which Bella was held responsible. But she continued to work at the café as the lead singer in Nate's band.


Bella has honey-blonde hair that cascades down past her shoulders. It appears to be a naturally wavy texture, as evidence when she wears it loose. She often styles it by braiding it to the side. Usually, she wears it down though. Bella's eyes are ocean blue, and she has a bronzed complexion. She is not quite as tan as Cleo Sertori but not as pale as Rikki Chadwick and Emma Gilbert. She appears to be the shortest of the mermaid trio. Bella has a slim yet curvaceous figure. Out of all the girls, she wears dresses the most. She wears colors that reflect more earthy tones, such as greens, blacks, and flowery designs. Bella, with the other two mermaids, is never seen without her signature blue necklace (with the exception of her mermaid form.)


Isabella "Bella" Hartley is the new girl who moves to town in Season 3 after Emma left to travel the world with her family. When a mysterious water tentacle attacks the girls and captures Rikki, Cleo jumps in to save her and Bella catches sight of her tail. Although shocked at first, she quickly reveals to the girls that she is a mermaid as well, and helps save Rikki from the water tentacle. The next morning, the girls and Lewis discussed her transformation and she showed them her power on Lewis' drink, briefly turning water into a gelatin substance. The girls then ask Bella to join them, which she agrees. She has also been described as: bringing something that the group has never had before.

After the Events of Season Three

In the spin off series, Mako Mermaids, Bella is indirectly mentioned by Rikki, who appears in the show. Rikki reveals that Bella eventually moved from the Gold Coast after graduating high school. It is unknown what happened to her.

Becoming a Mermaid

Bella became a mermaid when she was nine years old. She was with her parents in Ireland, but they were too busy at work, so she explored the area a lot. She found a sea cave. When she jumped into the pool on a full moon night, she was transformed into a mermaid. Bella found a dark blue crystal at the bottom of the moon pool, where she became a mermaid. She tied this crystal on a brown string and has been wearing it ever since.

Mermaid Powers

Bella possesses the ability to transform into a mermaid ten seconds after she touches water. Once her body is completely dry, she turns back into human along with the outfit she was wearing before the transformation. She has the ability to swim at super speed of 600km/h, hold her breath for more than fifteen minutes, and dive at a depth deeper than any ordinary human-being is capable of.


Bella has the ability to transform water and all things that contain water into a jelly-like substance. Bella also shows the ability to change its viscosity. Bella is shown to control the duration of her power's effect.


Bella also has the ability to transform water and all things that contain water into a substance similar to crystal or glass. Bella uses this power to create stepping stones, to cross a river without getting wet, and to transform the sculpture that Cleo was molding with her power for Rikki's birthday present. Bella is shown to control the duration of her power's effect.


Will Benjamin

Normal bscap435

Bella and Will kissing underwater

See the main article: Bella-Will Relationship

Bella develops a crush on Will almost as soon as she moves to town. Because he is often curious about what he "thinks" he saw, Rikki always tells Bella to stay away from him to keep their secret safe. As they become closer, Will starts to have feelings for her. On one occasion, he accidentally dripped water on her chin and she is forced to run into the ocean before she transformed into a mermaid. Will then becomes suspicious of her and pours a glass of water on her hand, forcing her to transform in front of him. Although shocked at first, he agrees to keep her secret (though she keeps Cleo and Rikki's identities a secret).

However, Bella often hears Will talking about mermaids and the magic of it, and begins to feel that he is only interested in her because of her mermaid magic and breaks off their friendship. Eventually, they become friends again after Will finds out that Cleo and Rikki are mermaids as well. In one episode, she mistakenly hears Will asking Rikki to a party and decides to go with Nate to make him jealous. At the party, they clear up the misunderstanding and officially become a couple.


  • Her full name, Isabella Hartley, is revealed in the last episode, Graduation.
  • Her name is misspelled in the Season 3 Media Kit as "Isabel Hartley."
  • She and Lewis are the only main characters whose houses were never revealed in the series.
  • She never met Emma, but might have after the shows run, Rikki references all of her mermaid friends in her final appearance.
  • She was turned into a mermaid in the Sea Caves of Ireland, unlike Cleo, Emma and Rikki.
  • Her favorite color is green and wears clothes based on gemstone colors similar to her power.
  • The show never reveal her being affected by the full moon, but maybe before she moved to Gold Coast, she was once affected by the full moon.
  • Due to Bella moving every year it is unknown what country she is from, it is most likely she is Australian or Irish.
  • Bella's parents and house are never shown in the series. It is unknown if she has any siblings.
  • Bella's parents are mentioned and it is known that her dad works in hotel management.
  • She hasn't many very many friends in the past because she moved around a lot.
  • Because she gained her tail and powers at the age of nine Bella is considered the oldest mermaid, but also the youngest to be turned into a mermaid in H2O: Just Add Water.


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