Name: Nicholas St. North Occupation: Santa Claus; Guardian of Wonder; leader of the Guardians. Age: Unknown; immortal. Personality: Boisterous, courageous, enthusiastic, impulsive, generous, stubborn, demanding, and warm-hearted. A former Cossack warrior with a childlike sense of wonder. Fatherly toward his fellow Guardians, particularly Jack. Appearance: Enormous, muscular, broad-built older man with blue eyes, thick eyebrows, a long white beard and mustache. Wears a red fur-trimmed coat, red plaid shirt, and black fur hat. Has "Naughty" and "Nice" tattooed on his forearms.

Name: E. Aster Bunnymund Occupation: Easter Bunny; Guardian of Hope. Age: Ancient; exact age unknown. Personality: Sarcastic, blunt, disciplined, confident, pragmatic, competitive, and protective. Has a dry Australian sense of humor and a short temper when provoked. Initially distrustful of Jack. Appearance: Tall, muscular, anthropomorphic Pooka rabbit with grayish-blue fur, emerald-green eyes, and flower-like markings on his forehead and shoulders. Wears leather bracers, foot wrappings, and carries enchanted boomerangs.

Name: Toothiana Occupation: Tooth Fairy; Guardian of Memories. Age: Ancient; exact age unknown. Personality: Cheerful, bubbly, affectionate, elegant, curious, energetic, compassionate, and fiercely protective. Passionate about preserving childhood memories. Can become frantic when her fairies or collected memories are threatened. Has a noticeable fondness for Jack. Appearance: Graceful human-hummingbird hybrid with pink eyes, fair skin, and an abundance of shimmering turquoise, green, and purple iridescent feathers. Has multiple delicate wings, golden feather-like jewelry, and elegant tail feathers resembling a dress.

Name: Sanderson Mansnoozie Occupation: Sandman; Guardian of Dreams. Age: Ancient; oldest Guardian. Personality: Gentle, peaceful, wise, patient, affectionate, playful, and protective. Rarely aggressive, but becomes a formidable fighter when children are threatened. Never speaks; communicates through expressive gestures and animated images formed from golden Dreamsand. Appearance: Short, round, golden-skinned dream spirit with golden-brown eyes and short golden hair styled into five points. His body and night-robe-like clothing shimmer with golden Dreamsand.

Name: Jackson Overland Frost (Jack Frost) Occupation: Spirit of Winter; Guardian of Fun. Age: Over 300 years old; physically 17. Personality: Mischievous, sarcastic, rebellious, playful, adventurous, independent, stubborn, and occasionally reckless. Enjoys pranks and having fun, especially with children. Beneath his carefree attitude, he is lonely, insecure, and longs to be noticed, appreciated, and believed in. Has a strong protective streak. Appearance: Tall, slender teenage-looking spirit with pale skin, messy white hair, and bright icy-blue eyes. Wears a blue hooded sweater, worn brown trousers, and goes barefoot. Carries a crooked wooden staff.

Name: Pitch Black Occupation: The Boogeyman; Nightmare King; embodiment of Fear. Age: Ancient; exact age unknown. Personality: Manipulative, cunning, intelligent, cruel, calculating, sarcastic, theatrical, arrogant, and spiteful. Takes pleasure in exploiting people's fears and psychologically tormenting his enemies. Deeply resentful of the Guardians and jealous of the belief they receive. Beneath his threatening demeanor lies profound loneliness and a desperate desire to be feared and acknowledged. Appearance: Tall, unnaturally slender figure with pale gray skin, sharp features, slick, spiked black hair, and glowing silver-golden eyes. Wears a long, flowing black robe that blends into shadows.

The Man in the Moon (Manny) Occupation: Celestial protector of Earth's children; creator and chooser of the Guardians. Age: Unknown; ancient celestial being. Personality: Mysterious, wise, observant, patient, benevolent, and enigmatic. Rarely communicates directly, preferring to guide events through subtle signs and messages. His intentions are often difficult to understand.