Rikki Chadwick is one of the main characters who became a mermaid in the Australian television series, "H2O - Just add Water". Along with Emma and Cleo, Rikki discovered her powers after her trip to Mako Island. She is played by actress Cariba Heine.
Unlike Emma and Cleo, Rikki's family is more broken up as her mother isn't around. When she was little, her parents fought a lot over the issues of money. Eventually they got a divorce and Rikki lives with her father, Terry Chadwick. It is revealed in season one that her father forgets her birthday every year. And unlike her friends, Rikki doesn't live in a house, rather she and her father lives in a trailer park by the canal as her father's income isn't very high. Growing up in a struggling environment, Rikki lacks the personality of a snob and she tends to be weary of being around one, such as Miriam Kent and Zane Bennett.
Since her parents' break-up, Rikki is used to people not liking her so when people express their affections and kindness towards her, she feels uncomfortable and fenced in. Before moving into the Gold Coast, Rikki is used to being alone and she usually prefers it that way. When Emma's younger brother developed a crush on her, Rikki brushed off his feelings and ended up hurting him by refusing his affection. Throughout the series, Rikki slowly abandoned her isolation and learned to accept other people's caring feeling for her, although at times, she still like to be alone whenever she's depressed or frustrated. It is most likely because of her parents' divorce, Rikki developed the personality of a rebel like her father. And being the new girl in the neighborhood, Rikki lacks the ability to make new friends. It is only until she saved Cleo from being drifted in Zane's boat that Cleo opened up to her and offered Rikki her friendship as well as Emma's.
Rikki is the only mermaid who's father's occupation is unknown. While Emma's father is a business man in sales and Cleo's father is a fisherman, the only hint the audience have about Terry is his hobby on in motorcycle. This could imply that he is an auto-mechanic.
Despite growing up in a more poor environment than her boyfriend, Zane, Rikki display a knowledge and skill on economic business, especially when it comes to saving her café business from being bankrupt.
Rikki is the polar opposite of Emma not just in their magical powers, but in their personalities as well. While Emma is confident, controlling, and responsible, Rikki is quite rebellious, independent, sarcastic and carefree. Like her father, she is contemptuous of the social hierarchy at the local high school she and the others attend as well as in life. Unlike Emma who tends to hold her tongue in certain situations, Rikki frequently speaks her mind without euphemism or without care that her opinions might hurt other people's feelings. She can be very stubborn and has a short temper. Rikki has a strong adventurous streak and is the first to fully embrace the possibilities of the girls' new powers.
Not only does Rikki shows her rebellious nature freely, but she encourage it in her friends as well. In "Pressure Cooker", Rikki encouraged Cleo and Emma to rebel against Charlotte Watsford and her mother, Annette Watsford who were invited by Don Sertori to stay over for dinner. Thinking that Don is getting remarried and that Charlotte will become Cleo's step-sister, Rikki encouraged the others to use their powers to ruin the food, not knowing that Annette was only invited as a business partner.
Despite her carefree nature, Rikki is capable of displaying a sense of responsibilities especially when it comes to money. In the episode "Hook, Line and Sinker", Rikki attempted to look for some financial security for her family by attending Harrison Bennett's seminar, only to find it to be a scam. In "Treasure Hunt", Rikki attempted to help her father by trying to find a lost treasure for the reward money because her family was struggling with the bills. During her stay as café manager in season three, she was able to show her ability in running a business successful. When Rikki left after breaking up with Zane, the café started to struggle despite Sophie replacing her as manager.
Rikki is described as pretty but doesn't care. She has wavy-curly, light-blond that goes a bit past her shoulders hair and bold sky blue eyes. Throughout the series, she would let her hair loose, tie it up into a bun, or braid them. Her skin is fair and smooth with hardly any blemishes. She has a slim body type and plump pink lips. As a mermaid, her hair is let down and she has an orange-scaled tail with a matching orange-scaled top. She rarely wears a dress, but in season one, Zane bought her a sexy, red dress to wear during his father's lunch meeting. Her clothes are red and black based on her ability to boil water and fire. In Season 3, she started to wear more colorful clothes. Her favorite colors are red and black based on her clothing. She doesn't really try to look good most of the time, due to the fact she is a tomboy but can if she desires to.
After Cleo gets tricked into helping Zane Bennett repair his boat, he sets her adrift into the sea. Rikki jumps aboard the boat to save her, revealing that she was the one who stole Zane's spark plug to his boat. Plugging it back in, Rikki and Cleo decided to take the boat for a joyride. Along the ride, the girls ran into Emma, who was walking home from her swim training. Exchanging a quick banter, the two invited Emma to come along with them. 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 cell 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, Rikki decided to take a morning walk around her neighborhood. Surprisingly, Rikki first discovered that she transform into a mermaid when she was hit by single drop of water from the park sprinkler system. After confirming her theory with Emma and Cleo, Rikki grew excited and embraced her new changes. Rikki was the last to discover her powers, which bothers her greatly.