(n.) A personification, in German and Scandinavian mythology, of a spirit natural power supposed to work mischief and ruin, esp. to children.

Ariel Befind Corrigan Dingbelle Fifinella Finnbeara Hob Hobgoblin JD Lilliputian Mab Oberon Puck Titania Tom Thumb bad boy bad fairy bad peri banshee booger brat brownie buffoon bugger cluricaune cutup devil deviling devilkin diablotin dwarf enfant terrible erlking fairy fairy queen fay funmaker gamin gnome goblin gremlin hob holy terror homunculus hood hoodlum hooligan imp joker jokester juvenile delinquent knave kobold leprechaun little devil little monkey little rascal manikin midge midget minx mischief mischief-maker ouphe peewee peri pip-squeak pixie poltergeist pooka practical joker prankster puca puck punk punk kid pwca pygmy rapscallion rascal rogue rowdy ruffian runt scamp scapegrace shrimp spoiled brat sprite sylph sylphid tokoloshe urchin wag wart whippersnapper young devil