Alma LeFay Peregrine is an ymbryne, a peculiar who has the power to manipulate time and take the form of a bird.

Ymbrines can create "temporal loops in which peculiar folk can live indefinitely." Miss Peregrine created her loop on September 3, 1940 to protect her peculiar children from a bomb.

Hallowgasts prey on peculiar children as they need peculiar souls to evolve into Wights.

Addison MacHenry, a Boxer with a very high IQ and the ability to speak, lives in Miss Wren's menagerie. Having been named "Boxie" by his only human owner, he bit him in the face and took his name.

Miss Wren's loop is entered through a hole in a large rock in a lake that resembles the head of Cuthbert the Giant from "Tales of the Peculiar."

After stowing aboard a gypsy caravan, the children are discovered and locked in an animal cage. When wights approach the gypsy camp, the gypsies protect the peculiar children by covering the cage with a tarp as a gypsy man throws his voice into the cage, realistically impersonating the roar of a giant bear.

When the children are captured by Mr. White and his men, Hugh releases a "million manic bees" to destroy the wights.

Wights look human with the exception that their eyes are completely white.

Perplexus Anomalous drew the very first edition of the Map of Days, an intricate cartography of peculiardom. Due to his knowledge of the Library of Souls, Caul kidnapped him from his loop and found the location of the Library.

Joel-and-Peter are discovered under St. Paul's after their loop is raided. They use their peculiar power of echolocation to help the children navigate the catacombs.