Yverk

Yverk (イヴェルク) was a character of The Promised Neverland, and an antagonist of the Cuvitidala Arc. He was a duke as well as one of the heads of the Five Regent Families.

Appearance
Like almost all demons, he wears a mask protecting his eyes and face. Other than that, Yverk seems to be a tall demon who wears formal clothes, probably because of his position as the leader of his house.

Personality
Being the head of his respective house, Yverk seems to be a powerful and strict man who constantly reprimanded Dozza on his manners and behavior. Yverk seems to hold a lot of respect to the queen, instantly kneeling for her when she entered the room where he was waiting for her.

Introduction Arc
Holding a Vida plant in his hands, Yverk commented on how the orphans in the premium farms would satisfy since they are special meals for  to feast on as compared to the lower grade human meat he and the other demons consume. Yverk added how they should celebrate the harvest and pray for.

Cuvitidala Arc
On November 2047, in the imperial capital, Yverk stood side by side with the four other representatives of the different houses. Yverk was consistently reprimanding Dozza's manners and kneeled onto the ground when queen Legravalima made her entrance.

Imperial Capital Battle Arc
He was later killed by Geelan after the latter infiltrated the Royal Capital to get revenge.