Monster

The Monster is an evil spirit that appeared in the Devilgram Say His Name, where it devoured Beelzebub and MC and would only release them unless Beelzebub guessed its name.

Personality
Little is known about it, but it is very hostile toward humans and especially volatile towards Beelzebub for forgetting it. It also knows the brothers and Diavolo, Barbatos, and Solomon, all which has negative views on them.

It also revealed that they love sleeping and its younger sister.

Trivia

 * As of now, this character has not appeared in any other Devilgrams or in the main storyline.