One of the antagonists of The Promised Neverland. He belonged to the group of Demons called the Poachers. It was later revealed that he served as a purveyor for the Grand Valley orphanage who delivers the children to Goldy Pond.

Lewis was a tall and slender demon with three fingers on each hand, and three toes on each foot. His entire body is clothed and he wears a high collar cape over it. He also wears a matching top hat decorated with rope-like looms. Just like most other demons, his face is covered with a mask with four holes on top of each other with the upper three allowing him to see, and the bottom one which revealed his sharp canines.

He also owns a pet named Parvus which is often seen on his shoulder. It has two eyes (one on top and a much bigger one below) and the physical features of a monkey, and it wears a tiny crown on top of its head.

The features that lies under his mask were revealed when the man successfully shot and broke his mask. He bears the appearance of other demons of his kind, with 3 vertically positioned eyes on his face, and sharp canines.