Nerissa is the mother of Zac Blakely and Mimmi. To join the eastern pod in the battle against the rebel mermaid Aurora she left her daughter Mimmi and her son Zac when they were very young, She was turned into a Fearsome Water Chinese dragon by Aurora and attacked Wei Lan's pod or the Eastern pod under Aurora´s control. After the attack on the eastern pod she fell in a deep slumber until she felt Zac and Mimmi found each other. She felt the connection between Mimmi and Zac grew stronger and as a result the spell that transformed her into the dragon began to lift. Finally she woke up and saw Wei Lan in the Chinese waters and follow her to Mako when Wei Lan swum scared away. She is also a descendant of the merman who created the merman cave. And is known for being a very powerful mermaid.