(n.) A rascal; a good-for-nothing fellow.

bad boy blackguard booger buffoon bugger cutup devil elf enfant terrible funmaker hood hoodlum hooligan imp joker jokester knave limb little devil little monkey little rascal minx mischief mischief-maker pixie practical joker prankster precious rascal puck rascal rogue rowdy ruffian scalawag scamp scapegrace scoundrel shyster sneak spalpeen villain wag