Blopper is a squishy blue blob with red blush and a face. It disguises itself as a strawberry-topped cupcake.
Blopper replaces Cappy in the Extra Game. While disguised as a cupcake, it hops about Green Greens in a manner similar to Cappy. As it does this it will shoot globs of frosting into the air that deal two bars of damage and make it difficult to approach. Long range attacks such as Star Spit and Air Bullet work best against it.
Stationary Bloppers that don't shoot frosting and frostingless Bloppers exist as well and are arguably the weakest Extra Mode enemies in this state. There are also a few Bloppers that wear frosting yet can be inhaled without revealing their true forms.