Peculiar children
- Jacob Magellan Portman — A 16-year-old American teenager and the protagonist of the story. Jacob becomes subject to acute stress reaction after witnessing his grandfather's death and claiming that a monster from his grandfather's childhood stories had killed him. Everyone he knows begins to consider him crazy and avoids him. His parents eventually take him to see a psychiatrist, on whose instruction Jacob's dad takes him on a trip to the Welsh island where his grandfather grew up. There, Jacob discovers that the stories of a magical orphanage and both peculiar children and the monster are real. He also learns that the ability to see these monsters is actually an extremely rare peculiarity as they are invisible to all but a few like himself.
- Abraham Ezra Portman — Abraham was Jacob's grandfather who also had the peculiarity of seeing the monsters. He left Miss Peregrine's loop as a young man to join both the war against Germany and the war against the hollowgast, promising to make a home in America for his fellow peculiars. But having started a family of his own during his time in the normal world, he never went back for them. In spite of this, he was still pressured into eradicating hollows, resulting in long, frequent hunting-trips away from his wife and two children, a secret which they took as careless neglect. Over the years, Abraham became a near-stranger to everyone he knew and, in his old age, was killed by one of the very monsters he had fought so valiantly to defeat. Police simply concluded that dementia and an attack by wild animals were the cause of his death.
- Emma Bloom — Emma is a teenager under Miss Peregrine's care. Her peculiarity manifested in her hands when she was ten years old. They began to glow red, becoming painfully hot to the point of generating fire. Emma had a romantic relationship with Abraham which they maintained even as he went to war until he stopped responding to her letters. After years without replying, Abraham finally wrote her back simply to tell her he could no longer do so because he'd married another woman. Emma became heartbroken and bitter but still mourned him upon learning of his death when his grandson Jacob arrived in Miss Peregrine's time loop. Although she treated Jacob harshly at first, their mutual sorrow for Abraham started a deeply sincere relationship between them.
- Millard Nullings — Millard is a young adolescent possessing the peculiarity of invisibility which is said to be quite uncommon. He chooses to go about nude to stay fully invisible, but wears clothes at supper on Miss Peregrine's orders. He is also exceptionally well-versed in all things peculiar and, as a hobby, spends much of his time documenting every little detail of the day they live in.
- Bronwyn Bruntley — A young adolescent possessing super-human strength, Bronwyn is also kindhearted and a loyal friend. She respects and obeys Miss Peregrine more than her fellow wards do, often correcting them and citing rules they're meant to follow, mostly in fear of anyone getting in trouble. The only occasions for which she refuses to cooperate are when she is made to dress ladylike. Before Miss Peregrine took her and her older brother Victor in, Bronwyn discovered her own strength at the age of ten when she snapped their abusive stepfather's neck without actually meaning to.
- Enoch O'Connor — A young adolescent with the ability to resurrect the dead and bring inanimate objects to life for a limited time by using the extracted organs of other living things. Enoch was born to a family of undertakers and, before moving into time loops, caused tremendous confusion by frequently bringing the dead to life at his father's funeral parlor. He is the least liked of Miss Peregrine's wards as the others are put off by his selfish behavior, negative thinking, and obsession with violence. His previous ymbryne was never specified, nor were his reasons for relocating to Miss Peregrine's loop.
- Olive Abroholos Elephanta — Olive is the second youngest to Claire and comes across as quite giddy and openly friendly. Her peculiarity renders her lighter than air, making her float freely like a balloon. She has barely any control over it and must always be weighted down or bound to something to keep from floating away. Her most routine means is a pair of heavy leaden shoes.
- Hugh Apiston — Hugh is a teenager with bees living in his stomach. His peculiarity allows him to communicate with them and command them. He is in love with Fiona Fraunfeld. He met her in a field, and the two fell in love. Hugh has mentioned that he cares for his bees deeply.
- Horace Somnusson — Horace is a young adolescent capable of having prophetic dreams, albeit very scarcely. They occur most often as nightmares of events so horrifying, they have a tendency to throw him into bouts of shock. He can be quite a snob and is an extremely passionate follower of fashion, commonly seen in a suit and tie with a top hat and monocle.
- Fiona Frauenfeld — Fiona is a teenager possessing power over plants. Her peculiarity allows her to manipulate their life and growth and control their movements. She speaks with a thick Irish accent, though she rarely speaks at all, and has a romantic, symbiotic relationship with Hugh.
- Claire Densmore — The youngest of all Miss Peregrine's wards, Claire also possesses the most grotesque peculiarity in their midst: a second mouth in the back of her head with sharp teeth, hidden beneath her blonde curls. She is typically cheerful but becomes shy and self-conscious when made to dine with others.
- Victor Bruntley — Miss Peregrine once had many more peculiars under her care, many of whom were killed by the hollowgast, including Bronwyn's older brother Victor. Like Bronwyn, Victor possessed immense physical strength. He left during the loop's early days, claiming he couldn't stand being trapped there; it was a reckless decision which led to his demise. Until his burial when the loop closed, his lifeless body had remained at Miss Peregrine's home, locked away in his bedroom and neatly laid to rest in bed. Some of the children would occasionally sneak in and have Enoch resurrect him, though he always seemed to be in a rush to get back to the afterlife.
Ymbrynes
All ymbrynes take on last names which correspond to the type of bird into which they can shapeshift (e.g., Miss Peregrine can turn into a peregrine falcon).
- Alma LeFay Peregrine — Miss Peregrine is a highly skilled ymbryne and the headmistress of her children's-home. She is a delicate woman who enjoys smoking a pipe and adores her charges, though she can be strict at times. At a very young age, she learned to hone her peculiarity as a student under Miss Avocet. Miss Peregrine's loop is located on the fictional island of Cairnholm, Wales, on September 3, 1940, though it's actually September 2 for the first few hours.
- Esmerelda Avocet — Miss Avocet is an elderly and wise woman from the mid-Victorian period in England. Having taught most notable ymbrynes to master their craft, she is regarded as near-royalty. Her loop is in Derbyshire on July 15, 1867, but it was invaded by wights and hollowgast, forcing her to flee to Miss Peregrine's loop.
- Miss Janet Nightjar — Miss Nightjar takes in difficult cases of peculiars. One such case being Miss Peregrine's former ward, Charlotte. Miss Nightjar's loop is in Swansea, Wales on April 3, 1901, and is co-run by Miss Thrush.
- Miss Dawn Finch — Miss Finch has an aunt who is also an ymbryne but prefers to stay in finch form. Their loop is based in London, but the date is not stated.
- Millicent Thrush — Miss Thrush has a loop in London and is headmistress of a children's home there but also co-runs Miss Nightjar's special-care home.
- Miss Alice Kestrel — Possibly a rather historical ymbryne. Enoch mentions an old story of her being injured in a road accident. The incident is said to have trapped her in the form of a kestrel for an entire week, leading to the collapse of her loop before she healed. Location and date are not stated.
- Balenciaga Wren — Miss Wren is the headmistress of a menagerie for peculiar animals. Her loop is based in mainland Wales in a much older, unknown time.
- Miss Bianca Gannett — Miss Gannett has a loop in Ireland, in June 1770.
- Miss Emily Treecreeper — Miss Peregrine mentions her name but doesn't remember where or when her loop is based.
Normals
- Franklin Portman — Jacob's father, Frank, is an unemployed, amateur ornithologist who volunteers at a bird rescue and likes to pass it off as his job. He also spends much of his time writing manuscripts for nature books, though he's never completed one, giving up on his every project midway. His whole life, he's had a rather rough relationship with his own father, Abraham, as he was almost never around. Frank is very protective of his son, but understands his need for room to grow and learn on his own.
- Maryann Portman — Maryann is Jacob's obsessively materialistic mother and Franklin's wife. She comes from a wealthy family that owns a drugstore company with one hundred and fifteen branches across the state of Florida. While she loves her son and is immensely protective of him, she tends to be more concerned about public image and what people think of them.
- Dr. Jeff Golan — Dr. Golan was one of the many peculiars who supported and participated in the disastrous experiment that created the hollowgast. He is among those who have reached the state of being a wight, a term he disowns as "their word." He is a licensed psychiatrist and, in order to uncover information on Miss Peregrine's loop, has been stalking the Portman family for years under many a guise including their yard man, Jacob's middle school bus driver Mr. Barron, and ultimately himself when Jacob begins seeing him for therapy.
- Malthus — Malthus was once a peculiar and an old friend of Dr. Golan's who also joined the rebellion against the ymbrynes, dying by the results of the experiment designed to overthrow them and reemerging a hollow. He now travels with the restored Golan, devouring peculiars as they discover time loops. For reasons not specified, Golan allowed him to kill Abraham before they could learn the location of Miss Peregrine's loop. From then on, Malthus haunted Jacob, keeping a vigil on him day and night.
- Martin Pagett — Martin is a part-time but knowledgeable and well-spoken curator of a small museum on Cairnholm, though due to the island's sparse renown and low tourist appeal, they rarely see any patronage. He strikes up a bond with Jacob, giving him a rundown of Cairnholm's history and assisting him in learning how the children's home was destroyed. Martin plays an unwitting but vital role in discovering Malthus and Dr. Golan on the island.
- Oggie — Oggie is Martin's uncle, whom he introduces to Jacob in order to help him learn more about the fallen children's home. Elderly and gruff but still sharp of wit, Oggie recalls the strange children and their reclusive headmistress and recounts the bombing in detail, occasionally veering off into rants on the weather and politics. Though he longed to fight for his country, he was too young then and merely watched it all take place.
- Susan Portman — Susan is Frank's younger sister and Jacob's aunt. While going through Abraham's possessions with them after his passing, she found his copy of The Selected Works of Ralph Waldo Emerson and that he had written a brief well-wish to Jacob on the title page. When she gives it to him on his birthday, Jacob unwittingly discovers a letter from Miss Peregrine when it fell out from between the pages.
- Ricky — Ricky is described as Jacob's best and only friend, though their relationship is more of a deal for personal benefit: in exchange for Jacob helping Ricky with his homework, Ricky acts as Jacob's bodyguard at school.
