I haven't found an official profile for Hippo yet.

Hippo is Luchia's guardian....well, i guess thats what you could call him. He seems more like her errand boy for awhile... Doing dishes, laundry and so on. Poor Hippo seems to have the worst luck.

Despite all of this, Hippo is an amazing character. He has a super Kawaii human form(pictured below), and he can turn into Hippocampus, a creature from Greek Mythology(also pictured below).

But he's still abused....Poor Hippo.