'Complementary' in the Bible

Now the Lord God said, “It is not good (beneficial) for the man to be alone; I will make him a helper [one who balances him—a counterpart who is] suitable and complementary for him.”

And the man gave names to all the livestock, and to the birds of the air, and to every animal of the field; but for Adam there was not found a helper [that was] suitable (a companion) for him.