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Boo, also known as BOO!, is a floating white ball lookalike thing which might be a ghost, but nobody's sure. Its name is derived from the frequently used interjection, "BOO!". While it's not sure if he says "boo" or "moo", Boo is also called Cow, but since Boo doesn't look like a cow (he only tastes like one), many prefer calling him Boo. There is a Boo who is apart of the Association of Board Hosts. They are also creatures in Dragon Quest: Un-Mario Edition as rank 3/6 monsters at night time in level 4.
Life as boo is tedious. The only way for a boo to talk is to shoot cheesy hamster droppings into its mouth.