In sharp contrast to the diminutive Shroomish, Breloom sports an agile shape, similar to a kangaroo or a theropod. It has a mushroom-like green "cap" on its head with visible gills and a round, somewhat berry-like or oak gall-like portion on both sides. Breloom's head, neck and tail are tan in coloration. Breloom's mouth is somewhat beak-like in shape, and there is a petal-like arrangement of extensions from its shoulders. Breloom's chest and lower body is green, and its feet have two red claws. Breloom has seed clusters made of hardened toxic spores on the end of its tail, which it uses to slam into its foe. Its arms appear to be short and of little use, but they can stretch surprisingly far to deliver punches. Its red foreclaws are ideal for slicing.