Pipi is Karen's penguin friend and the messanger of the Antarctic Ocean Castle. She is seen in episode 15 of Mermaid Melody Pure and She looking for Lucia and the other mermaid princesses and to bring them to the Antarctic Ocean to help Karen.
Pipi is a penguin with a pink bow on the left side of her head. She was first mistook by Lucia and Hanon who thought she was Hippo. Later in the episode, Pipi contact the other mermaid princesses to aid Lucia against the Black Beauty Sisters and Mikeru.