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Isabella Hartley known as Bella, 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 a trip to the Sea Caves of Ireland. She was played by Indiana Evans.


Isabella "Bella" Hartley is the new girl in town and appears after Emma has left to travel the world with her parents. When a mysterious Water Tentacle attacks the girls and captures Rikki, Bella sees a part of Rikki's tail, and Cleo jumps into the water to save Rikki. Bella is shocked, but also jumps into the water quickly after Cleo jumped in. She reveals her tail to Cleo and saves Rikki together with Cleo from the water tentacle. The next morning, the girls and Lewis McCartney discuss Bella's tail and Bella shows them her powers on Lewis' drink. Bella can turn water into a gelatin substance. After that, the girls ask Bella to join them, and she agrees. She has also been described as bringing something to the group that they've never had before.

Bella also applied for a waitress job at a café called Rikki's. But meanwhile Bella was making a drink for a customer, Sophie Benjamin changed the drink by adding a chili pepper in the drink while Bella wasn't paying attention, so it would look like Sophie indeed was suitable for the job, instead of Bella. Bella didn't get the job, but she continued to work at the café as the lead singer in Nate's band.

After the Events of Season Three

In the spin off series, Mako: Island of Secrets, Rikki, who appears in this show, talks about her friends, what happened to them. Rikki reveals that her friends eventually moved from the Gold Coast after graduating high school, but Bella's name is actually never said. It is unknown what happened to Bella.


Bella is a bit withdrawn and sensitive because she's a mermaid, meaning that she's afraid to reveal herself. But deep from the inside, she 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 with. She always enjoyed walking around in the Ireland fields while her parents were both at work. Later she became a fun lovely girl with her two new friends.


Bella has honey-blonde hair that fall straight down past her shoulders. Her hair also seems to have a naturally wavy texture, which you can see when she wears her hair loose, tough sometimes it gets straighter, probably due to its weight or humidity. She sometimes wears a side braid or a ponytail, but mostly wears her hair down, sometimes having tiny braids throughout. Bella's eyes are ocean blue, and her skin has a honey-bronze color. She is not quite as tan as Cleo Sertori but not as pale as Rikki Chadwick and Emma Gilbert. She seems to be the shortest of the mermaid trio at 5'2". Bella has a slim but curvaceous figure. Bella is the one who wears the most dresses in the mermaid trio. She wears colors that reflect more earthly or ocean inspired tones, such as blue, purple, white, yellow, aqua, green, black, and flower designs. If Bella wears swim clothes, they mostly have a flower design. Bella is never seen without her blue necklace with the exception of her mermaid form. Later in season 3, her friends also get the same necklace made by Will.

When in mermaid from, her hair is down and she has an orange-scaled tail with a matching top. Like the rest of the girls, her skin is glowing and ethereal when in mermaid form.

Becoming a Mermaid

Bella became a mermaid when she was nine years old. She lived with her parents in Ireland at the time, but they were too busy at work, so she explored the area a lot. She found a sea cave with a pool, and 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 Moon Pool where she became a mermaid. She tied this crystal on a brown string and has been wearing it ever since.

Mermaid Powers

Like Rikki, Cleo, and Emma, Bella possesses the ability to transform into a mermaid ten seconds after physical contact with water. Once her body is completely dry, she turns back into a human along with the outfit she was wearing before the transformation. She has the ability to swim at a super speed, hold her breath for more than 20 minutes, and dive at a depth deeper than any ordinary human-being is capable of.

Entering the Irish Moon Pool alone, Bella received the powers of Gelidkinesis and Substanciakinesis.


Before her transformation, Bella had all the typical weaknesses of a human. When she transformed, she now is susceptible to all the weaknesses of a mermaid.

Loss of Power Control

Bella is allergic to Will's aftershave, and it causes her mermaid magic to go out of control. Every time she sneezes, her gelidkinesis involuntarily comes into play and turns any liquid in the room or nearby into the jelly-like substance.


Will Benjamin

Bella develops feelings for Will as soon as she arrives in town. Because Will often asks Bella about what he "thinks" he saw, Rikki tells Bella to stay away from him to keep their secret safe. As they become closer, Will starts to have feelings for Bella. On one day, Will accidentally drops water on Bella's chin when he wants to kiss her, and she is forced to run into the ocean before she transforms into a mermaid. Will then becomes curious and intentionally throws a glass of water on Bella's hand, forcing Bella to jump into the water. Will follows her, and sees what she really is. Although he's shocked at first, he agrees to keep her secret. But Bella lies about Cleo and Rikki when Will asks her if they are also mermaids.

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



  • Bella's full name is Isabella Hartley. This is revealed in the last episode, "Graduation".
  • Her nickname "Bella", means beautiful in Italian.
  • Bella's name is misspelled in season 3 Media Kit as "Isabel Hartley."
  • Bella and Lewis are the only main characters whose houses were never revealed in the series.
  • Bella actually never met Emma in the series, but she might have after Emma came back (though that's unknown).
  • Bella was turned into a mermaid in the Sea Caves of Ireland, unlike Cleo, Emma and Rikki. How Bella got her powers and tail is shown in "Revealed".
  • Bella's favorite color is aqua. She also wears clothes based on gemstone colors similar to her power.
  • The show never shows us Bella being affected by the full moon, unlike Emma, Cleo, Rikki and Charlotte but she might had the same problem as the trio before she moved to the Gold Coast.
  • Bella tells us in the series that she always moved from country to country because of her parents jobs, so it's not clear which she was born in but it's most likely that she's Australian because of her accent, and the fact that her parents stayed at the Gold Coast.
  • Bella's home and parents were never shown in the series. It is unknown if she has any siblings or if she is an only child.
  • Bella's father works in hotel management.
  • Bella didn't have a lot of friends in the past because she moved from country to country all the time.
  • Bella got her powers and tail when she was nine years old, and this makes her the oldest mermaid in the series, but she's also the youngest who ever got powers in H2O: Just Add Water.