Metabon

Birthday: Unknown
Blood type: Unknown
Special skill: Being cheeky
Favorite food: Dried wheat gluten snack
Least favorite food: Nothing

A strange creature belonging to the Academy, an organization that nurtures the "Compatible Ones." While it clings onto Akane and the rest, teaching them about many things, it's cheeky and quibbles a lot.

(Source: Divine Gate Wikia)