He's apparently a very cute acrylic charm, but We can't tell for sure because he's so small.
This official Katamari Damacy acrylic charm was designed by Ikuno Ohashi of Fangamer Japan. At about 8 centimeters (3.1 inches) tall, it's larger than actual size! (Each acrylic charm is protected in transit by a paper film—make sure to remove it once yours arrives!)
KATAMARI DAMACY™&©BANDAI NAMCO Entertainment Inc.