Does Hippo turned into a human???

Hippo turnes into a human in episode 25.It is not Mermaid Melody Pure.

Kinda. He actually turns into something like....a sea angel??? But actually, his true form is the Hippocampus :).

Hippo is a is sort of a human but his temporary form was a penguin, auk Tak-San mentions this in episode 25

But later hippo tell every one that his true from is hippocampus