Tabuu, Ruler of Subspace
A Secret To Everybody
Tabuu (タブー, Tabuu) is the leader of the Subspace Army and the final boss of Subspace Emissary. He uses the Subspace Bombs to send entire locations to his dimension, where he absorbs their power to increase his own. His name is likely a pun on the English word "taboo", which is to be unacceptable or improper by society's terms. He is a cold hearted ruler and because of him, R.O.B. is the last of his kind.