Hippo

Hippo is a heroic talking penguin who serves as the guardian and a guide to Lucia and the other mermaids. He is to play as Lucia's pet penguin. Hippo has a tendancy of eating almost anything, often causing problems for everyone.

Personality
Hippo is very protective of Lucia and is always worrisome of she and the other mermaids all together. At the start of the anime, he clearly opposes the thought of the mermaid princesses dating humans because he is afraid they will reach the stage of admitting their feelings and turn into bubbles.

Hippo has the shortest temper and often lets what's on his mind come out of his mouth. Though sometimes his thoughts are correct, some get him kicked, smacked, pulled, whacked, chased, hammered, and much more. He also seems to have a tendancy to barge into the bathroom while the mermaids were in the bath, resulting him getting splashed.

Once turning into his human form (episode 25), he first hated his look, thinking that his penguin form was better. He later realized that his human form was better, and fell in love with Yuri. one of the Dark Lovers. Despite that he knew he was in love with a Dark Lover, he still secretly met with Yuri, for he was always wanting to see her again and again. He has to suffer an unexpected shock in order to transform (as seen in episode 34, when he changed by getting bonked by a rock twice.)

Appearance
In episode 6, Hippo wore a cute little tuxedo to the aquarium to meet other penguins at the penguin section of the aquarium.
 * Penguin Form: Hippo is a blue penguin wearing a sailor's outfit and a white hat on the top. His eyes are notably large especially when he is angry.
 * Human Form: Hippo has blonde hair, pale skin, and light green eyes. He still has his sailor outfit and hat, only his blue pants became very short shorts. Added to his outfit were white socks, and brown shoes. He is usually seen with Yuri when in his human form.
 * Hippocampus Form: Hippo achieved this form after getting the key Sara gave to Taro.