Rikki Chadwick is one of the three main characters in Nickelodeon’s H2O: Just Add Water. The series takes place on the Gold Coast of Australia. A strange encounter with the magical moonpool on Mako Island turns the girls into mermaids! Now Emma, Cleo, and Rikki must navigate life as a human on land and mermaid in the water. Rikki is the rebellious tomboy of the group, but she can sometimes act feisty. Her mermaid power is boiling water. Cariba Heine portrays this character in all three seasons, and returns for a cameo in the spinoff, Mako Mermaids.