meet Penny Marcovaldo is the Adoptive Daughter of Massimo Marcovaldo, an Italian fisherman, cook, and Penny and Giulia's father. Her real parnet's were sea monster's but they are Eating by great white shark and Massimo found her on the beach at night she was sad and alone that she lost her mom and dad. So Massimo Adopt and rised her as his daughter. When Penny touch the water she as Scales and a tail she found out she was a sea monster so her father Massimo and penny keep it a secret of everyone ever her sister Giulia. She become friend's with two other Sea monster's Luca Paguro and Alberto Scorfano.