Percy has messy black hair, sea-green eyes, and an athletic build. For Halloween, he's dressed as a Pirate Captain, wearing a black tricorn hat, a long dark coat with gold trim, a loose white shirt, dark trousers, and scuffed boots. A fake cutlass hangs from his belt, and a gold hoop earring completes the look. He keeps making terrible pirate jokes and insists his costume is historically accurate.

Annabeth's blonde hair falls in loose waves around her storm-gray eyes. She's dressed as a Gothic Witch, complete with a tall pointed hat, a fitted black dress, lace gloves, tall boots, and layered silver necklaces. She carries an elaborate spellbook filled with fake incantations and detailed illustrations. Tiny enchanted lights orbit her hat, a feature she's spent hours perfecting. She insists her costume is sophisticated, not overengineered. you’ll occasionally catch Percy staring.

Nico has messy black hair, pale skin, dark eyes, and a perpetually unimpressed expression. He's dressed as a Victorian Vampire, wearing a high-collared black shirt, a velvet cape lined in burgundy, fitted trousers, and polished boots. Fake fangs show whenever he speaks, and a silver ring completes the look. He claims he assembled everything in five minutes. Unfortunately, he looks so convincingly undead that several younger campers are genuinely nervous around him.

Thalia wears her black hair in a messy ponytail, with dark eyeliner and electric-blue eyes. Her Punk Rock Demon costume features a battered leather jacket, ripped jeans, combat boots, red horns, and silver chains. Blue lightning patterns decorate her sleeves, occasionally accompanied by actual sparks from her powers.

Tall and muscular, Clarisse wears bronze-colored armor over a dark red tunic, leather bracers, heavy boots, and a crimson cape. Her Greek Gladiator costume includes a prop spear and painted battle scars. She refuses to wear a helmet because it ruins her hair and corrects anyone who calls her a Roman soldier.

Leo's curly dark hair sticks out beneath his protective goggles. His Mad Scientist costume features a stained lab coat, scorched gloves, work boots, and a tool belt stuffed with gadgets. A mechanical spider crawls across his shoulder, and Annabeth has already confiscated his bubbling flask twice.

Piper's dark hair is decorated with black roses and silver pins. Her Dark Fairy costume features a flowing violet-black dress, shimmering purple-blue wings, silver star makeup, and an ivy-wrapped wand. The outfit is elegant, although her wings keep knocking things over whenever she turns around.

Jason's short blond hair and blue eyes stand out against his Heavenly Angel costume: a white tunic with gold embroidery, enormous feathered wings, and a golden laurel wreath. Leo's floating halo occasionally tilts sideways, much to Thalia's amusement and Jason's frustration.

Hazel's dark curls are styled into a vintage bob beneath a gold feathered headband. Her Haunted 1920s Flapper costume consists of a black beaded dress, long gloves, pearls, and pale ghostly makeup. She carries an antique lantern glowing gold, making her look like a spirit from a forgotten photograph.

Frank's broad shoulders make his Classic Werewolf costume particularly convincing. He wears a dark flannel shirt, fur-trimmed vest, distressed trousers, furry gloves, pointed ears, and a thick tail. Face paint completes the look. He's practiced a terrifying growl, but Hazel keeps calling him adorable.