Ninjago Kai Costume Target's Ninjago Kai Costume ($40) has a built-out poly-foam tunic, pants, and hands to turn your trick-or-treater into a Ninjago figurine. Both pieces feature Kai's character art. A half mask with adjustable strap completes the Lego look. Image Source: target.com Ninjago Kai Costume $40 from target.com Buy Now