Iruma Suzuki

Rank: As of now in the Manga, Iruma achieved Rank [5] He.
Familiars: His very first and only familiar is a demon named Callego Naberius, whom he managed to summon in the form of a flying owl in episode 2 of the series.

A human boy whose parents sold him to a demon named Sullivan, who subsequently transports him to the Demon World and adopts him as his grandson. He starts his new life by being enrolled into Babyls Demon School, where he constantly has to hide the fact that he is a human in order to avoid being eaten. However, after quickly making friends with fellow classmates Asmodeus and Clara, he eventually grows accustomed to his new lifestyle through both his numerous adventures and encounters with other demons.