Rikki Chadwick is a fictional character from the Australian television series H2O: Just Add Water. She is portrayed as a strong-willed and independent teenager who gains the ability to transform into a mermaid after coming into contact with water from the Moon Pool. Rikki is known for her fiery personality and her unique power to create and control fire. In the series, Rikki forms close friendships with fellow mermaids Cleo Sertori and Emma Gilbert. Together, they navigate the challenges of being teenagers while keeping their mermaid identities a secret. Rikki's character is celebrated for her bravery and loyalty, making her a beloved figure among fans of the show.