|Voice Actor||Miyako Ito|
|Anime Debut||The Pearl Tear
Shinju no Namida(真珠の涙)
Hippo (ヒッポ) is a 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.
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, wacked, 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.
AppearanceEdit''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.
In episode 6, Hippo wore a cute little tuxedo to the aquarium to meet other penguins at the penguin section of the aquarium.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.
- The true form of hippo is that of a human. Hippo is Lucie's best friend; He worries a lot for her when he knows she's in love with Kaito; To the point of lying to him by telling him that it will turn into a bubble. Hippo generally turns into pinguing to keep its powers of the ocean longer.