Reitgeist index, which analyzes search data nationally and regionally, revealed that this year's top Halloween costumes searches were barbie, a princess, spider man, a witch, a fairy, wednesday Adams, dinosaur, dinosaur, cowboy, ninja, bunny, Ken, Mario. Couples costume searches, of course, were barbie and Ken, Mario and Luigi, bonnie and Clyde, Cosmo and Wanda and lilo and Stitch